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@@ -0,0 +1,1632 @@
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+package textarea
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+
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+import (
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+ "crypto/sha256"
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+ "fmt"
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+ "image/color"
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+ "strconv"
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+ "strings"
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+ "time"
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+ "unicode"
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+
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+ "github.com/atotto/clipboard"
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+ "github.com/charmbracelet/bubbles/v2/cursor"
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+ "github.com/charmbracelet/bubbles/v2/key"
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+ tea "github.com/charmbracelet/bubbletea/v2"
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+ "github.com/charmbracelet/lipgloss/v2"
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+ "github.com/charmbracelet/x/ansi"
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+ rw "github.com/mattn/go-runewidth"
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+ "github.com/rivo/uniseg"
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+ "slices"
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+)
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+
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+const (
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+ minHeight = 1
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+ defaultHeight = 1
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+ defaultWidth = 40
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+ defaultCharLimit = 0 // no limit
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+ defaultMaxHeight = 99
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+ defaultMaxWidth = 500
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+
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+ // XXX: in v2, make max lines dynamic and default max lines configurable.
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+ maxLines = 10000
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+)
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+
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+// Internal messages for clipboard operations.
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+type (
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+ pasteMsg string
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+ pasteErrMsg struct{ error }
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+)
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+
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+// KeyMap is the key bindings for different actions within the textarea.
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+type KeyMap struct {
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+ CharacterBackward key.Binding
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+ CharacterForward key.Binding
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+ DeleteAfterCursor key.Binding
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+ DeleteBeforeCursor key.Binding
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+ DeleteCharacterBackward key.Binding
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+ DeleteCharacterForward key.Binding
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+ DeleteWordBackward key.Binding
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+ DeleteWordForward key.Binding
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+ InsertNewline key.Binding
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+ LineEnd key.Binding
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+ LineNext key.Binding
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+ LinePrevious key.Binding
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+ LineStart key.Binding
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+ Paste key.Binding
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+ WordBackward key.Binding
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+ WordForward key.Binding
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+ InputBegin key.Binding
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+ InputEnd key.Binding
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+
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+ UppercaseWordForward key.Binding
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+ LowercaseWordForward key.Binding
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+ CapitalizeWordForward key.Binding
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+
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+ TransposeCharacterBackward key.Binding
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+}
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+
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+// DefaultKeyMap returns the default set of key bindings for navigating and acting
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+// upon the textarea.
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+func DefaultKeyMap() KeyMap {
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+ return KeyMap{
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+ CharacterForward: key.NewBinding(key.WithKeys("right", "ctrl+f"), key.WithHelp("right", "character forward")),
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+ CharacterBackward: key.NewBinding(key.WithKeys("left", "ctrl+b"), key.WithHelp("left", "character backward")),
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+ WordForward: key.NewBinding(key.WithKeys("alt+right", "alt+f"), key.WithHelp("alt+right", "word forward")),
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+ WordBackward: key.NewBinding(key.WithKeys("alt+left", "alt+b"), key.WithHelp("alt+left", "word backward")),
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+ LineNext: key.NewBinding(key.WithKeys("down", "ctrl+n"), key.WithHelp("down", "next line")),
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+ LinePrevious: key.NewBinding(key.WithKeys("up", "ctrl+p"), key.WithHelp("up", "previous line")),
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+ DeleteWordBackward: key.NewBinding(key.WithKeys("alt+backspace", "ctrl+w"), key.WithHelp("alt+backspace", "delete word backward")),
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+ DeleteWordForward: key.NewBinding(key.WithKeys("alt+delete", "alt+d"), key.WithHelp("alt+delete", "delete word forward")),
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+ DeleteAfterCursor: key.NewBinding(key.WithKeys("ctrl+k"), key.WithHelp("ctrl+k", "delete after cursor")),
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+ DeleteBeforeCursor: key.NewBinding(key.WithKeys("ctrl+u"), key.WithHelp("ctrl+u", "delete before cursor")),
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+ InsertNewline: key.NewBinding(key.WithKeys("enter", "ctrl+m"), key.WithHelp("enter", "insert newline")),
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+ DeleteCharacterBackward: key.NewBinding(key.WithKeys("backspace", "ctrl+h"), key.WithHelp("backspace", "delete character backward")),
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+ DeleteCharacterForward: key.NewBinding(key.WithKeys("delete", "ctrl+d"), key.WithHelp("delete", "delete character forward")),
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+ LineStart: key.NewBinding(key.WithKeys("home", "ctrl+a"), key.WithHelp("home", "line start")),
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+ LineEnd: key.NewBinding(key.WithKeys("end", "ctrl+e"), key.WithHelp("end", "line end")),
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+ Paste: key.NewBinding(key.WithKeys("ctrl+v"), key.WithHelp("ctrl+v", "paste")),
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+ InputBegin: key.NewBinding(key.WithKeys("alt+<", "ctrl+home"), key.WithHelp("alt+<", "input begin")),
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+ InputEnd: key.NewBinding(key.WithKeys("alt+>", "ctrl+end"), key.WithHelp("alt+>", "input end")),
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+
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+ CapitalizeWordForward: key.NewBinding(key.WithKeys("alt+c"), key.WithHelp("alt+c", "capitalize word forward")),
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+ LowercaseWordForward: key.NewBinding(key.WithKeys("alt+l"), key.WithHelp("alt+l", "lowercase word forward")),
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+ UppercaseWordForward: key.NewBinding(key.WithKeys("alt+u"), key.WithHelp("alt+u", "uppercase word forward")),
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+
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+ TransposeCharacterBackward: key.NewBinding(key.WithKeys("ctrl+t"), key.WithHelp("ctrl+t", "transpose character backward")),
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+ }
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+}
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+
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+// LineInfo is a helper for keeping track of line information regarding
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+// soft-wrapped lines.
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+type LineInfo struct {
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+ // Width is the number of columns in the line.
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+ Width int
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+
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+ // CharWidth is the number of characters in the line to account for
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+ // double-width runes.
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+ CharWidth int
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+
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+ // Height is the number of rows in the line.
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+ Height int
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+
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+ // StartColumn is the index of the first column of the line.
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+ StartColumn int
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+
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+ // ColumnOffset is the number of columns that the cursor is offset from the
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+ // start of the line.
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+ ColumnOffset int
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+
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+ // RowOffset is the number of rows that the cursor is offset from the start
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+ // of the line.
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+ RowOffset int
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+
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+ // CharOffset is the number of characters that the cursor is offset
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+ // from the start of the line. This will generally be equivalent to
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+ // ColumnOffset, but will be different there are double-width runes before
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+ // the cursor.
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+ CharOffset int
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+}
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+
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+// CursorStyle is the style for real and virtual cursors.
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+type CursorStyle struct {
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+ // Style styles the cursor block.
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+ //
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+ // For real cursors, the foreground color set here will be used as the
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+ // cursor color.
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+ Color color.Color
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+
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+ // Shape is the cursor shape. The following shapes are available:
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+ //
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+ // - tea.CursorBlock
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+ // - tea.CursorUnderline
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+ // - tea.CursorBar
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+ //
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+ // This is only used for real cursors.
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+ Shape tea.CursorShape
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+
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+ // CursorBlink determines whether or not the cursor should blink.
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+ Blink bool
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+
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+ // BlinkSpeed is the speed at which the virtual cursor blinks. This has no
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+ // effect on real cursors as well as no effect if the cursor is set not to
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+ // [CursorBlink].
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+ //
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+ // By default, the blink speed is set to about 500ms.
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+ BlinkSpeed time.Duration
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+}
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+
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+// Styles are the styles for the textarea, separated into focused and blurred
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+// states. The appropriate styles will be chosen based on the focus state of
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+// the textarea.
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+type Styles struct {
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+ Focused StyleState
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+ Blurred StyleState
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+ Cursor CursorStyle
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+}
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+
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+// StyleState that will be applied to the text area.
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+//
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+// StyleState can be applied to focused and unfocused states to change the styles
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+// depending on the focus state.
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+//
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+// For an introduction to styling with Lip Gloss see:
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+// https://github.com/charmbracelet/lipgloss
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+type StyleState struct {
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+ Base lipgloss.Style
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+ Text lipgloss.Style
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+ LineNumber lipgloss.Style
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+ CursorLineNumber lipgloss.Style
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+ CursorLine lipgloss.Style
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+ EndOfBuffer lipgloss.Style
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+ Placeholder lipgloss.Style
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+ Prompt lipgloss.Style
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+}
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+
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+func (s StyleState) computedCursorLine() lipgloss.Style {
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+ return s.CursorLine.Inherit(s.Base).Inline(true)
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+}
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+
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+func (s StyleState) computedCursorLineNumber() lipgloss.Style {
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+ return s.CursorLineNumber.
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+ Inherit(s.CursorLine).
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+ Inherit(s.Base).
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+ Inline(true)
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+}
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+
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+func (s StyleState) computedEndOfBuffer() lipgloss.Style {
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+ return s.EndOfBuffer.Inherit(s.Base).Inline(true)
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+}
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+
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+func (s StyleState) computedLineNumber() lipgloss.Style {
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+ return s.LineNumber.Inherit(s.Base).Inline(true)
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+}
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+
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+func (s StyleState) computedPlaceholder() lipgloss.Style {
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+ return s.Placeholder.Inherit(s.Base).Inline(true)
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+}
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+
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+func (s StyleState) computedPrompt() lipgloss.Style {
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+ return s.Prompt.Inherit(s.Base).Inline(true)
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+}
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+
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+func (s StyleState) computedText() lipgloss.Style {
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+ return s.Text.Inherit(s.Base).Inline(true)
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+}
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+
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+// line is the input to the text wrapping function. This is stored in a struct
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+// so that it can be hashed and memoized.
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+type line struct {
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+ runes []rune
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+ width int
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+}
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+
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+// Hash returns a hash of the line.
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+func (w line) Hash() string {
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+ v := fmt.Sprintf("%s:%d", string(w.runes), w.width)
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+ return fmt.Sprintf("%x", sha256.Sum256([]byte(v)))
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+}
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+
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+// Model is the Bubble Tea model for this text area element.
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+type Model struct {
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+ Err error
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+
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+ // General settings.
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+ cache *MemoCache[line, [][]rune]
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+
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+ // Prompt is printed at the beginning of each line.
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+ //
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+ // When changing the value of Prompt after the model has been
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+ // initialized, ensure that SetWidth() gets called afterwards.
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+ //
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+ // See also [SetPromptFunc] for a dynamic prompt.
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+ Prompt string
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+
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+ // Placeholder is the text displayed when the user
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+ // hasn't entered anything yet.
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+ Placeholder string
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+
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+ // ShowLineNumbers, if enabled, causes line numbers to be printed
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+ // after the prompt.
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+ ShowLineNumbers bool
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+
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+ // EndOfBufferCharacter is displayed at the end of the input.
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+ EndOfBufferCharacter rune
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+
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+ // KeyMap encodes the keybindings recognized by the widget.
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+ KeyMap KeyMap
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+
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+ // Styling. FocusedStyle and BlurredStyle are used to style the textarea in
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+ // focused and blurred states.
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+ Styles Styles
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+
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+ // virtualCursor manages the virtual cursor.
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+ virtualCursor cursor.Model
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+
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+ // VirtualCursor determines whether or not to use the virtual cursor. If
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+ // set to false, use [Model.Cursor] to return a real cursor for rendering.
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+ VirtualCursor bool
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+
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+ // CharLimit is the maximum number of characters this input element will
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+ // accept. If 0 or less, there's no limit.
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+ CharLimit int
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+
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+ // MaxHeight is the maximum height of the text area in rows. If 0 or less,
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+ // there's no limit.
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+ MaxHeight int
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+
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+ // MaxWidth is the maximum width of the text area in columns. If 0 or less,
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+ // there's no limit.
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+ MaxWidth int
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+
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+ // If promptFunc is set, it replaces Prompt as a generator for
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+ // prompt strings at the beginning of each line.
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+ promptFunc func(line int) string
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+
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+ // promptWidth is the width of the prompt.
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+ promptWidth int
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+
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+ // width is the maximum number of characters that can be displayed at once.
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+ // If 0 or less this setting is ignored.
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+ width int
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+
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+ // height is the maximum number of lines that can be displayed at once. It
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+ // essentially treats the text field like a vertically scrolling viewport
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+ // if there are more lines than the permitted height.
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+ height int
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+
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+ // Underlying text value.
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+ value [][]rune
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+
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+ // focus indicates whether user input focus should be on this input
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+ // component. When false, ignore keyboard input and hide the cursor.
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+ focus bool
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+
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+ // Cursor column.
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+ col int
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+
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+ // Cursor row.
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+ row int
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+
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+ // Last character offset, used to maintain state when the cursor is moved
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+ // vertically such that we can maintain the same navigating position.
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+ lastCharOffset int
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+
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+ // rune sanitizer for input.
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+ rsan Sanitizer
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+}
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+
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+// New creates a new model with default settings.
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+func New() Model {
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+ cur := cursor.New()
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+
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+ styles := DefaultDarkStyles()
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+
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+ m := Model{
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+ CharLimit: defaultCharLimit,
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+ MaxHeight: defaultMaxHeight,
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+ MaxWidth: defaultMaxWidth,
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+ Prompt: lipgloss.ThickBorder().Left + " ",
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+ Styles: styles,
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+ cache: NewMemoCache[line, [][]rune](maxLines),
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+ EndOfBufferCharacter: ' ',
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+ ShowLineNumbers: true,
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+ VirtualCursor: true,
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+ virtualCursor: cur,
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+ KeyMap: DefaultKeyMap(),
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+
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+ value: make([][]rune, minHeight, maxLines),
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+ focus: false,
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+ col: 0,
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+ row: 0,
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+ }
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+
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+ m.SetWidth(defaultWidth)
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+ m.SetHeight(defaultHeight)
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+
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+ return m
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+}
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+
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+// DefaultStyles returns the default styles for focused and blurred states for
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+// the textarea.
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+func DefaultStyles(isDark bool) Styles {
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+ lightDark := lipgloss.LightDark(isDark)
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+
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+ var s Styles
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+ s.Focused = StyleState{
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+ Base: lipgloss.NewStyle(),
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+ CursorLine: lipgloss.NewStyle().Background(lightDark(lipgloss.Color("255"), lipgloss.Color("0"))),
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+ CursorLineNumber: lipgloss.NewStyle().Foreground(lightDark(lipgloss.Color("240"), lipgloss.Color("240"))),
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+ EndOfBuffer: lipgloss.NewStyle().Foreground(lightDark(lipgloss.Color("254"), lipgloss.Color("0"))),
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+ LineNumber: lipgloss.NewStyle().Foreground(lightDark(lipgloss.Color("249"), lipgloss.Color("7"))),
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+ Placeholder: lipgloss.NewStyle().Foreground(lipgloss.Color("240")),
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+ Prompt: lipgloss.NewStyle().Foreground(lipgloss.Color("7")),
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+ Text: lipgloss.NewStyle(),
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+ }
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+ s.Blurred = StyleState{
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+ Base: lipgloss.NewStyle(),
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+ CursorLine: lipgloss.NewStyle().Foreground(lightDark(lipgloss.Color("245"), lipgloss.Color("7"))),
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+ CursorLineNumber: lipgloss.NewStyle().Foreground(lightDark(lipgloss.Color("249"), lipgloss.Color("7"))),
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+ EndOfBuffer: lipgloss.NewStyle().Foreground(lightDark(lipgloss.Color("254"), lipgloss.Color("0"))),
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+ LineNumber: lipgloss.NewStyle().Foreground(lightDark(lipgloss.Color("249"), lipgloss.Color("7"))),
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+ Placeholder: lipgloss.NewStyle().Foreground(lipgloss.Color("240")),
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+ Prompt: lipgloss.NewStyle().Foreground(lipgloss.Color("7")),
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+ Text: lipgloss.NewStyle().Foreground(lightDark(lipgloss.Color("245"), lipgloss.Color("7"))),
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+ }
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+ s.Cursor = CursorStyle{
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+ Color: lipgloss.Color("7"),
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+ Shape: tea.CursorBlock,
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+ Blink: true,
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+ }
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+ return s
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+}
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+
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+// DefaultLightStyles returns the default styles for a light background.
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+func DefaultLightStyles() Styles {
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+ return DefaultStyles(false)
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+}
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+
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+// DefaultDarkStyles returns the default styles for a dark background.
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+func DefaultDarkStyles() Styles {
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+ return DefaultStyles(true)
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+}
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+
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+// updateVirtualCursorStyle sets styling on the virtual cursor based on the
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+// textarea's style settings.
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+func (m *Model) updateVirtualCursorStyle() {
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|
|
+ if !m.VirtualCursor {
|
|
|
+ m.virtualCursor.SetMode(cursor.CursorHide)
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ m.virtualCursor.Style = lipgloss.NewStyle().Foreground(m.Styles.Cursor.Color)
|
|
|
+
|
|
|
+ // By default, the blink speed of the cursor is set to a default
|
|
|
+ // internally.
|
|
|
+ if m.Styles.Cursor.Blink {
|
|
|
+ if m.Styles.Cursor.BlinkSpeed > 0 {
|
|
|
+ m.virtualCursor.BlinkSpeed = m.Styles.Cursor.BlinkSpeed
|
|
|
+ }
|
|
|
+ m.virtualCursor.SetMode(cursor.CursorBlink)
|
|
|
+ return
|
|
|
+ }
|
|
|
+ m.virtualCursor.SetMode(cursor.CursorStatic)
|
|
|
+}
|
|
|
+
|
|
|
+// SetValue sets the value of the text input.
|
|
|
+func (m *Model) SetValue(s string) {
|
|
|
+ m.Reset()
|
|
|
+ m.InsertString(s)
|
|
|
+}
|
|
|
+
|
|
|
+// InsertString inserts a string at the cursor position.
|
|
|
+func (m *Model) InsertString(s string) {
|
|
|
+ m.insertRunesFromUserInput([]rune(s))
|
|
|
+}
|
|
|
+
|
|
|
+// InsertRune inserts a rune at the cursor position.
|
|
|
+func (m *Model) InsertRune(r rune) {
|
|
|
+ m.insertRunesFromUserInput([]rune{r})
|
|
|
+}
|
|
|
+
|
|
|
+// insertRunesFromUserInput inserts runes at the current cursor position.
|
|
|
+func (m *Model) insertRunesFromUserInput(runes []rune) {
|
|
|
+ // Clean up any special characters in the input provided by the
|
|
|
+ // clipboard. This avoids bugs due to e.g. tab characters and
|
|
|
+ // whatnot.
|
|
|
+ runes = m.san().Sanitize(runes)
|
|
|
+
|
|
|
+ if m.CharLimit > 0 {
|
|
|
+ availSpace := m.CharLimit - m.Length()
|
|
|
+ // If the char limit's been reached, cancel.
|
|
|
+ if availSpace <= 0 {
|
|
|
+ return
|
|
|
+ }
|
|
|
+ // If there's not enough space to paste the whole thing cut the pasted
|
|
|
+ // runes down so they'll fit.
|
|
|
+ if availSpace < len(runes) {
|
|
|
+ runes = runes[:availSpace]
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Split the input into lines.
|
|
|
+ var lines [][]rune
|
|
|
+ lstart := 0
|
|
|
+ for i := range runes {
|
|
|
+ if runes[i] == '\n' {
|
|
|
+ // Queue a line to become a new row in the text area below.
|
|
|
+ // Beware to clamp the max capacity of the slice, to ensure no
|
|
|
+ // data from different rows get overwritten when later edits
|
|
|
+ // will modify this line.
|
|
|
+ lines = append(lines, runes[lstart:i:i])
|
|
|
+ lstart = i + 1
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if lstart <= len(runes) {
|
|
|
+ // The last line did not end with a newline character.
|
|
|
+ // Take it now.
|
|
|
+ lines = append(lines, runes[lstart:])
|
|
|
+ }
|
|
|
+
|
|
|
+ // Obey the maximum line limit.
|
|
|
+ if maxLines > 0 && len(m.value)+len(lines)-1 > maxLines {
|
|
|
+ allowedHeight := max(0, maxLines-len(m.value)+1)
|
|
|
+ lines = lines[:allowedHeight]
|
|
|
+ }
|
|
|
+
|
|
|
+ if len(lines) == 0 {
|
|
|
+ // Nothing left to insert.
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ // Save the remainder of the original line at the current
|
|
|
+ // cursor position.
|
|
|
+ tail := make([]rune, len(m.value[m.row][m.col:]))
|
|
|
+ copy(tail, m.value[m.row][m.col:])
|
|
|
+
|
|
|
+ // Paste the first line at the current cursor position.
|
|
|
+ m.value[m.row] = append(m.value[m.row][:m.col], lines[0]...)
|
|
|
+ m.col += len(lines[0])
|
|
|
+
|
|
|
+ if numExtraLines := len(lines) - 1; numExtraLines > 0 {
|
|
|
+ // Add the new lines.
|
|
|
+ // We try to reuse the slice if there's already space.
|
|
|
+ var newGrid [][]rune
|
|
|
+ if cap(m.value) >= len(m.value)+numExtraLines {
|
|
|
+ // Can reuse the extra space.
|
|
|
+ newGrid = m.value[:len(m.value)+numExtraLines]
|
|
|
+ } else {
|
|
|
+ // No space left; need a new slice.
|
|
|
+ newGrid = make([][]rune, len(m.value)+numExtraLines)
|
|
|
+ copy(newGrid, m.value[:m.row+1])
|
|
|
+ }
|
|
|
+ // Add all the rows that were after the cursor in the original
|
|
|
+ // grid at the end of the new grid.
|
|
|
+ copy(newGrid[m.row+1+numExtraLines:], m.value[m.row+1:])
|
|
|
+ m.value = newGrid
|
|
|
+ // Insert all the new lines in the middle.
|
|
|
+ for _, l := range lines[1:] {
|
|
|
+ m.row++
|
|
|
+ m.value[m.row] = l
|
|
|
+ m.col = len(l)
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Finally add the tail at the end of the last line inserted.
|
|
|
+ m.value[m.row] = append(m.value[m.row], tail...)
|
|
|
+
|
|
|
+ m.SetCursorColumn(m.col)
|
|
|
+}
|
|
|
+
|
|
|
+// Value returns the value of the text input.
|
|
|
+func (m Model) Value() string {
|
|
|
+ if m.value == nil {
|
|
|
+ return ""
|
|
|
+ }
|
|
|
+
|
|
|
+ var v strings.Builder
|
|
|
+ for _, l := range m.value {
|
|
|
+ v.WriteString(string(l))
|
|
|
+ v.WriteByte('\n')
|
|
|
+ }
|
|
|
+
|
|
|
+ return strings.TrimSuffix(v.String(), "\n")
|
|
|
+}
|
|
|
+
|
|
|
+// Length returns the number of characters currently in the text input.
|
|
|
+func (m *Model) Length() int {
|
|
|
+ var l int
|
|
|
+ for _, row := range m.value {
|
|
|
+ l += uniseg.StringWidth(string(row))
|
|
|
+ }
|
|
|
+ // We add len(m.value) to include the newline characters.
|
|
|
+ return l + len(m.value) - 1
|
|
|
+}
|
|
|
+
|
|
|
+// LineCount returns the number of lines that are currently in the text input.
|
|
|
+func (m *Model) LineCount() int {
|
|
|
+ return m.ContentHeight()
|
|
|
+}
|
|
|
+
|
|
|
+// Line returns the line position.
|
|
|
+func (m Model) Line() int {
|
|
|
+ return m.row
|
|
|
+}
|
|
|
+
|
|
|
+// CursorDown moves the cursor down by one line.
|
|
|
+// Returns whether or not the cursor blink should be reset.
|
|
|
+func (m *Model) CursorDown() {
|
|
|
+ li := m.LineInfo()
|
|
|
+ charOffset := max(m.lastCharOffset, li.CharOffset)
|
|
|
+ m.lastCharOffset = charOffset
|
|
|
+
|
|
|
+ if li.RowOffset+1 >= li.Height && m.row < len(m.value)-1 {
|
|
|
+ m.row++
|
|
|
+ m.col = 0
|
|
|
+ } else {
|
|
|
+ // Move the cursor to the start of the next line so that we can get
|
|
|
+ // the line information. We need to add 2 columns to account for the
|
|
|
+ // trailing space wrapping.
|
|
|
+ const trailingSpace = 2
|
|
|
+ m.col = min(li.StartColumn+li.Width+trailingSpace, len(m.value[m.row])-1)
|
|
|
+ }
|
|
|
+
|
|
|
+ nli := m.LineInfo()
|
|
|
+ m.col = nli.StartColumn
|
|
|
+
|
|
|
+ if nli.Width <= 0 {
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ offset := 0
|
|
|
+ for offset < charOffset {
|
|
|
+ if m.row >= len(m.value) || m.col >= len(m.value[m.row]) || offset >= nli.CharWidth-1 {
|
|
|
+ break
|
|
|
+ }
|
|
|
+ offset += rw.RuneWidth(m.value[m.row][m.col])
|
|
|
+ m.col++
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// CursorUp moves the cursor up by one line.
|
|
|
+func (m *Model) CursorUp() {
|
|
|
+ li := m.LineInfo()
|
|
|
+ charOffset := max(m.lastCharOffset, li.CharOffset)
|
|
|
+ m.lastCharOffset = charOffset
|
|
|
+
|
|
|
+ if li.RowOffset <= 0 && m.row > 0 {
|
|
|
+ m.row--
|
|
|
+ m.col = len(m.value[m.row])
|
|
|
+ } else {
|
|
|
+ // Move the cursor to the end of the previous line.
|
|
|
+ // This can be done by moving the cursor to the start of the line and
|
|
|
+ // then subtracting 2 to account for the trailing space we keep on
|
|
|
+ // soft-wrapped lines.
|
|
|
+ const trailingSpace = 2
|
|
|
+ m.col = li.StartColumn - trailingSpace
|
|
|
+ }
|
|
|
+
|
|
|
+ nli := m.LineInfo()
|
|
|
+ m.col = nli.StartColumn
|
|
|
+
|
|
|
+ if nli.Width <= 0 {
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ offset := 0
|
|
|
+ for offset < charOffset {
|
|
|
+ if m.col >= len(m.value[m.row]) || offset >= nli.CharWidth-1 {
|
|
|
+ break
|
|
|
+ }
|
|
|
+ offset += rw.RuneWidth(m.value[m.row][m.col])
|
|
|
+ m.col++
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// SetCursorColumn moves the cursor to the given position. If the position is
|
|
|
+// out of bounds the cursor will be moved to the start or end accordingly.
|
|
|
+func (m *Model) SetCursorColumn(col int) {
|
|
|
+ m.col = clamp(col, 0, len(m.value[m.row]))
|
|
|
+ // Any time that we move the cursor horizontally we need to reset the last
|
|
|
+ // offset so that the horizontal position when navigating is adjusted.
|
|
|
+ m.lastCharOffset = 0
|
|
|
+}
|
|
|
+
|
|
|
+// CursorStart moves the cursor to the start of the input field.
|
|
|
+func (m *Model) CursorStart() {
|
|
|
+ m.SetCursorColumn(0)
|
|
|
+}
|
|
|
+
|
|
|
+// CursorEnd moves the cursor to the end of the input field.
|
|
|
+func (m *Model) CursorEnd() {
|
|
|
+ m.SetCursorColumn(len(m.value[m.row]))
|
|
|
+}
|
|
|
+
|
|
|
+// Focused returns the focus state on the model.
|
|
|
+func (m Model) Focused() bool {
|
|
|
+ return m.focus
|
|
|
+}
|
|
|
+
|
|
|
+// activeStyle returns the appropriate set of styles to use depending on
|
|
|
+// whether the textarea is focused or blurred.
|
|
|
+func (m Model) activeStyle() *StyleState {
|
|
|
+ if m.focus {
|
|
|
+ return &m.Styles.Focused
|
|
|
+ }
|
|
|
+ return &m.Styles.Blurred
|
|
|
+}
|
|
|
+
|
|
|
+// Focus sets the focus state on the model. When the model is in focus it can
|
|
|
+// receive keyboard input and the cursor will be hidden.
|
|
|
+func (m *Model) Focus() tea.Cmd {
|
|
|
+ m.focus = true
|
|
|
+ return m.virtualCursor.Focus()
|
|
|
+}
|
|
|
+
|
|
|
+// Blur removes the focus state on the model. When the model is blurred it can
|
|
|
+// not receive keyboard input and the cursor will be hidden.
|
|
|
+func (m *Model) Blur() {
|
|
|
+ m.focus = false
|
|
|
+ m.virtualCursor.Blur()
|
|
|
+}
|
|
|
+
|
|
|
+// Reset sets the input to its default state with no input.
|
|
|
+func (m *Model) Reset() {
|
|
|
+ m.value = make([][]rune, minHeight, maxLines)
|
|
|
+ m.col = 0
|
|
|
+ m.row = 0
|
|
|
+ m.SetCursorColumn(0)
|
|
|
+}
|
|
|
+
|
|
|
+// san initializes or retrieves the rune sanitizer.
|
|
|
+func (m *Model) san() Sanitizer {
|
|
|
+ if m.rsan == nil {
|
|
|
+ // Textinput has all its input on a single line so collapse
|
|
|
+ // newlines/tabs to single spaces.
|
|
|
+ m.rsan = NewSanitizer()
|
|
|
+ }
|
|
|
+ return m.rsan
|
|
|
+}
|
|
|
+
|
|
|
+// deleteBeforeCursor deletes all text before the cursor. Returns whether or
|
|
|
+// not the cursor blink should be reset.
|
|
|
+func (m *Model) deleteBeforeCursor() {
|
|
|
+ m.value[m.row] = m.value[m.row][m.col:]
|
|
|
+ m.SetCursorColumn(0)
|
|
|
+}
|
|
|
+
|
|
|
+// deleteAfterCursor deletes all text after the cursor. Returns whether or not
|
|
|
+// the cursor blink should be reset. If input is masked delete everything after
|
|
|
+// the cursor so as not to reveal word breaks in the masked input.
|
|
|
+func (m *Model) deleteAfterCursor() {
|
|
|
+ m.value[m.row] = m.value[m.row][:m.col]
|
|
|
+ m.SetCursorColumn(len(m.value[m.row]))
|
|
|
+}
|
|
|
+
|
|
|
+// transposeLeft exchanges the runes at the cursor and immediately
|
|
|
+// before. No-op if the cursor is at the beginning of the line. If
|
|
|
+// the cursor is not at the end of the line yet, moves the cursor to
|
|
|
+// the right.
|
|
|
+func (m *Model) transposeLeft() {
|
|
|
+ if m.col == 0 || len(m.value[m.row]) < 2 {
|
|
|
+ return
|
|
|
+ }
|
|
|
+ if m.col >= len(m.value[m.row]) {
|
|
|
+ m.SetCursorColumn(m.col - 1)
|
|
|
+ }
|
|
|
+ m.value[m.row][m.col-1], m.value[m.row][m.col] = m.value[m.row][m.col], m.value[m.row][m.col-1]
|
|
|
+ if m.col < len(m.value[m.row]) {
|
|
|
+ m.SetCursorColumn(m.col + 1)
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// deleteWordLeft deletes the word left to the cursor. Returns whether or not
|
|
|
+// the cursor blink should be reset.
|
|
|
+func (m *Model) deleteWordLeft() {
|
|
|
+ if m.col == 0 || len(m.value[m.row]) == 0 {
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ // Linter note: it's critical that we acquire the initial cursor position
|
|
|
+ // here prior to altering it via SetCursor() below. As such, moving this
|
|
|
+ // call into the corresponding if clause does not apply here.
|
|
|
+ oldCol := m.col //nolint:ifshort
|
|
|
+
|
|
|
+ m.SetCursorColumn(m.col - 1)
|
|
|
+ for unicode.IsSpace(m.value[m.row][m.col]) {
|
|
|
+ if m.col <= 0 {
|
|
|
+ break
|
|
|
+ }
|
|
|
+ // ignore series of whitespace before cursor
|
|
|
+ m.SetCursorColumn(m.col - 1)
|
|
|
+ }
|
|
|
+
|
|
|
+ for m.col > 0 {
|
|
|
+ if !unicode.IsSpace(m.value[m.row][m.col]) {
|
|
|
+ m.SetCursorColumn(m.col - 1)
|
|
|
+ } else {
|
|
|
+ if m.col > 0 {
|
|
|
+ // keep the previous space
|
|
|
+ m.SetCursorColumn(m.col + 1)
|
|
|
+ }
|
|
|
+ break
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if oldCol > len(m.value[m.row]) {
|
|
|
+ m.value[m.row] = m.value[m.row][:m.col]
|
|
|
+ } else {
|
|
|
+ m.value[m.row] = append(m.value[m.row][:m.col], m.value[m.row][oldCol:]...)
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// deleteWordRight deletes the word right to the cursor.
|
|
|
+func (m *Model) deleteWordRight() {
|
|
|
+ if m.col >= len(m.value[m.row]) || len(m.value[m.row]) == 0 {
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ oldCol := m.col
|
|
|
+
|
|
|
+ for m.col < len(m.value[m.row]) && unicode.IsSpace(m.value[m.row][m.col]) {
|
|
|
+ // ignore series of whitespace after cursor
|
|
|
+ m.SetCursorColumn(m.col + 1)
|
|
|
+ }
|
|
|
+
|
|
|
+ for m.col < len(m.value[m.row]) {
|
|
|
+ if !unicode.IsSpace(m.value[m.row][m.col]) {
|
|
|
+ m.SetCursorColumn(m.col + 1)
|
|
|
+ } else {
|
|
|
+ break
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if m.col > len(m.value[m.row]) {
|
|
|
+ m.value[m.row] = m.value[m.row][:oldCol]
|
|
|
+ } else {
|
|
|
+ m.value[m.row] = append(m.value[m.row][:oldCol], m.value[m.row][m.col:]...)
|
|
|
+ }
|
|
|
+
|
|
|
+ m.SetCursorColumn(oldCol)
|
|
|
+}
|
|
|
+
|
|
|
+// characterRight moves the cursor one character to the right.
|
|
|
+func (m *Model) characterRight() {
|
|
|
+ if m.col < len(m.value[m.row]) {
|
|
|
+ m.SetCursorColumn(m.col + 1)
|
|
|
+ } else {
|
|
|
+ if m.row < len(m.value)-1 {
|
|
|
+ m.row++
|
|
|
+ m.CursorStart()
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// characterLeft moves the cursor one character to the left.
|
|
|
+// If insideLine is set, the cursor is moved to the last
|
|
|
+// character in the previous line, instead of one past that.
|
|
|
+func (m *Model) characterLeft(insideLine bool) {
|
|
|
+ if m.col == 0 && m.row != 0 {
|
|
|
+ m.row--
|
|
|
+ m.CursorEnd()
|
|
|
+ if !insideLine {
|
|
|
+ return
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if m.col > 0 {
|
|
|
+ m.SetCursorColumn(m.col - 1)
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// wordLeft moves the cursor one word to the left. Returns whether or not the
|
|
|
+// cursor blink should be reset. If input is masked, move input to the start
|
|
|
+// so as not to reveal word breaks in the masked input.
|
|
|
+func (m *Model) wordLeft() {
|
|
|
+ for {
|
|
|
+ m.characterLeft(true /* insideLine */)
|
|
|
+ if m.col < len(m.value[m.row]) && !unicode.IsSpace(m.value[m.row][m.col]) {
|
|
|
+ break
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ for m.col > 0 {
|
|
|
+ if unicode.IsSpace(m.value[m.row][m.col-1]) {
|
|
|
+ break
|
|
|
+ }
|
|
|
+ m.SetCursorColumn(m.col - 1)
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// wordRight moves the cursor one word to the right. Returns whether or not the
|
|
|
+// cursor blink should be reset. If the input is masked, move input to the end
|
|
|
+// so as not to reveal word breaks in the masked input.
|
|
|
+func (m *Model) wordRight() {
|
|
|
+ m.doWordRight(func(int, int) { /* nothing */ })
|
|
|
+}
|
|
|
+
|
|
|
+func (m *Model) doWordRight(fn func(charIdx int, pos int)) {
|
|
|
+ // Skip spaces forward.
|
|
|
+ for m.col >= len(m.value[m.row]) || unicode.IsSpace(m.value[m.row][m.col]) {
|
|
|
+ if m.row == len(m.value)-1 && m.col == len(m.value[m.row]) {
|
|
|
+ // End of text.
|
|
|
+ break
|
|
|
+ }
|
|
|
+ m.characterRight()
|
|
|
+ }
|
|
|
+
|
|
|
+ charIdx := 0
|
|
|
+ for m.col < len(m.value[m.row]) {
|
|
|
+ if unicode.IsSpace(m.value[m.row][m.col]) {
|
|
|
+ break
|
|
|
+ }
|
|
|
+ fn(charIdx, m.col)
|
|
|
+ m.SetCursorColumn(m.col + 1)
|
|
|
+ charIdx++
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// uppercaseRight changes the word to the right to uppercase.
|
|
|
+func (m *Model) uppercaseRight() {
|
|
|
+ m.doWordRight(func(_ int, i int) {
|
|
|
+ m.value[m.row][i] = unicode.ToUpper(m.value[m.row][i])
|
|
|
+ })
|
|
|
+}
|
|
|
+
|
|
|
+// lowercaseRight changes the word to the right to lowercase.
|
|
|
+func (m *Model) lowercaseRight() {
|
|
|
+ m.doWordRight(func(_ int, i int) {
|
|
|
+ m.value[m.row][i] = unicode.ToLower(m.value[m.row][i])
|
|
|
+ })
|
|
|
+}
|
|
|
+
|
|
|
+// capitalizeRight changes the word to the right to title case.
|
|
|
+func (m *Model) capitalizeRight() {
|
|
|
+ m.doWordRight(func(charIdx int, i int) {
|
|
|
+ if charIdx == 0 {
|
|
|
+ m.value[m.row][i] = unicode.ToTitle(m.value[m.row][i])
|
|
|
+ }
|
|
|
+ })
|
|
|
+}
|
|
|
+
|
|
|
+// LineInfo returns the number of characters from the start of the
|
|
|
+// (soft-wrapped) line and the (soft-wrapped) line width.
|
|
|
+func (m Model) LineInfo() LineInfo {
|
|
|
+ grid := m.memoizedWrap(m.value[m.row], m.width)
|
|
|
+
|
|
|
+ // Find out which line we are currently on. This can be determined by the
|
|
|
+ // m.col and counting the number of runes that we need to skip.
|
|
|
+ var counter int
|
|
|
+ for i, line := range grid {
|
|
|
+ // We've found the line that we are on
|
|
|
+ if counter+len(line) == m.col && i+1 < len(grid) {
|
|
|
+ // We wrap around to the next line if we are at the end of the
|
|
|
+ // previous line so that we can be at the very beginning of the row
|
|
|
+ return LineInfo{
|
|
|
+ CharOffset: 0,
|
|
|
+ ColumnOffset: 0,
|
|
|
+ Height: len(grid),
|
|
|
+ RowOffset: i + 1,
|
|
|
+ StartColumn: m.col,
|
|
|
+ Width: len(grid[i+1]),
|
|
|
+ CharWidth: uniseg.StringWidth(string(line)),
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if counter+len(line) >= m.col {
|
|
|
+ return LineInfo{
|
|
|
+ CharOffset: uniseg.StringWidth(string(line[:max(0, m.col-counter)])),
|
|
|
+ ColumnOffset: m.col - counter,
|
|
|
+ Height: len(grid),
|
|
|
+ RowOffset: i,
|
|
|
+ StartColumn: counter,
|
|
|
+ Width: len(line),
|
|
|
+ CharWidth: uniseg.StringWidth(string(line)),
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ counter += len(line)
|
|
|
+ }
|
|
|
+ return LineInfo{}
|
|
|
+}
|
|
|
+
|
|
|
+// Width returns the width of the textarea.
|
|
|
+func (m Model) Width() int {
|
|
|
+ return m.width
|
|
|
+}
|
|
|
+
|
|
|
+// moveToBegin moves the cursor to the beginning of the input.
|
|
|
+func (m *Model) moveToBegin() {
|
|
|
+ m.row = 0
|
|
|
+ m.SetCursorColumn(0)
|
|
|
+}
|
|
|
+
|
|
|
+// moveToEnd moves the cursor to the end of the input.
|
|
|
+func (m *Model) moveToEnd() {
|
|
|
+ m.row = len(m.value) - 1
|
|
|
+ m.SetCursorColumn(len(m.value[m.row]))
|
|
|
+}
|
|
|
+
|
|
|
+// SetWidth sets the width of the textarea to fit exactly within the given width.
|
|
|
+// This means that the textarea will account for the width of the prompt and
|
|
|
+// whether or not line numbers are being shown.
|
|
|
+//
|
|
|
+// Ensure that SetWidth is called after setting the Prompt and ShowLineNumbers,
|
|
|
+// It is important that the width of the textarea be exactly the given width
|
|
|
+// and no more.
|
|
|
+func (m *Model) SetWidth(w int) {
|
|
|
+ // Update prompt width only if there is no prompt function as
|
|
|
+ // [SetPromptFunc] updates the prompt width when it is called.
|
|
|
+ if m.promptFunc == nil {
|
|
|
+ // XXX: Do we even need this or can we calculate the prompt width
|
|
|
+ // at render time?
|
|
|
+ m.promptWidth = uniseg.StringWidth(m.Prompt)
|
|
|
+ }
|
|
|
+
|
|
|
+ // Add base style borders and padding to reserved outer width.
|
|
|
+ reservedOuter := m.activeStyle().Base.GetHorizontalFrameSize()
|
|
|
+
|
|
|
+ // Add prompt width to reserved inner width.
|
|
|
+ reservedInner := m.promptWidth
|
|
|
+
|
|
|
+ // Add line number width to reserved inner width.
|
|
|
+ if m.ShowLineNumbers {
|
|
|
+ // XXX: this was originally documented as needing "1 cell" but was,
|
|
|
+ // in practice, effectively hardcoded to 2 cells. We can, and should,
|
|
|
+ // reduce this to one gap and update the tests accordingly.
|
|
|
+ const gap = 2
|
|
|
+
|
|
|
+ // Number of digits plus 1 cell for the margin.
|
|
|
+ reservedInner += numDigits(m.MaxHeight) + gap
|
|
|
+ }
|
|
|
+
|
|
|
+ // Input width must be at least one more than the reserved inner and outer
|
|
|
+ // width. This gives us a minimum input width of 1.
|
|
|
+ minWidth := reservedInner + reservedOuter + 1
|
|
|
+ inputWidth := max(w, minWidth)
|
|
|
+
|
|
|
+ // Input width must be no more than maximum width.
|
|
|
+ if m.MaxWidth > 0 {
|
|
|
+ inputWidth = min(inputWidth, m.MaxWidth)
|
|
|
+ }
|
|
|
+
|
|
|
+ // Since the width of the viewport and input area is dependent on the width of
|
|
|
+ // borders, prompt and line numbers, we need to calculate it by subtracting
|
|
|
+ // the reserved width from them.
|
|
|
+
|
|
|
+ m.width = inputWidth - reservedOuter - reservedInner
|
|
|
+}
|
|
|
+
|
|
|
+// SetPromptFunc supersedes the Prompt field and sets a dynamic prompt instead.
|
|
|
+//
|
|
|
+// If the function returns a prompt that is shorter than the specified
|
|
|
+// promptWidth, it will be padded to the left. If it returns a prompt that is
|
|
|
+// longer, display artifacts may occur; the caller is responsible for computing
|
|
|
+// an adequate promptWidth.
|
|
|
+func (m *Model) SetPromptFunc(promptWidth int, fn func(lineIndex int) string) {
|
|
|
+ m.promptFunc = fn
|
|
|
+ m.promptWidth = promptWidth
|
|
|
+}
|
|
|
+
|
|
|
+// Height returns the current height of the textarea.
|
|
|
+func (m Model) Height() int {
|
|
|
+ return m.height
|
|
|
+}
|
|
|
+
|
|
|
+// ContentHeight returns the actual height needed to display all content
|
|
|
+// including wrapped lines.
|
|
|
+func (m Model) ContentHeight() int {
|
|
|
+ totalLines := 0
|
|
|
+ for _, line := range m.value {
|
|
|
+ wrappedLines := m.memoizedWrap(line, m.width)
|
|
|
+ totalLines += len(wrappedLines)
|
|
|
+ }
|
|
|
+ // Ensure at least one line is shown
|
|
|
+ if totalLines == 0 {
|
|
|
+ totalLines = 1
|
|
|
+ }
|
|
|
+ return totalLines
|
|
|
+}
|
|
|
+
|
|
|
+// SetHeight sets the height of the textarea.
|
|
|
+func (m *Model) SetHeight(h int) {
|
|
|
+ // Calculate the actual content height
|
|
|
+ contentHeight := m.ContentHeight()
|
|
|
+
|
|
|
+ // Use the content height as the actual height
|
|
|
+ if m.MaxHeight > 0 {
|
|
|
+ m.height = clamp(contentHeight, minHeight, m.MaxHeight)
|
|
|
+ } else {
|
|
|
+ m.height = max(contentHeight, minHeight)
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// Update is the Bubble Tea update loop.
|
|
|
+func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
|
|
|
+ if !m.focus {
|
|
|
+ m.virtualCursor.Blur()
|
|
|
+ return m, nil
|
|
|
+ }
|
|
|
+
|
|
|
+ // Used to determine if the cursor should blink.
|
|
|
+ oldRow, oldCol := m.cursorLineNumber(), m.col
|
|
|
+
|
|
|
+ var cmds []tea.Cmd
|
|
|
+
|
|
|
+ if m.value[m.row] == nil {
|
|
|
+ m.value[m.row] = make([]rune, 0)
|
|
|
+ }
|
|
|
+
|
|
|
+ if m.MaxHeight > 0 && m.MaxHeight != m.cache.Capacity() {
|
|
|
+ m.cache = NewMemoCache[line, [][]rune](m.MaxHeight)
|
|
|
+ }
|
|
|
+
|
|
|
+ switch msg := msg.(type) {
|
|
|
+ case tea.PasteMsg:
|
|
|
+ m.insertRunesFromUserInput([]rune(msg))
|
|
|
+ case tea.KeyPressMsg:
|
|
|
+ switch {
|
|
|
+ case key.Matches(msg, m.KeyMap.DeleteAfterCursor):
|
|
|
+ m.col = clamp(m.col, 0, len(m.value[m.row]))
|
|
|
+ if m.col >= len(m.value[m.row]) {
|
|
|
+ m.mergeLineBelow(m.row)
|
|
|
+ break
|
|
|
+ }
|
|
|
+ m.deleteAfterCursor()
|
|
|
+ case key.Matches(msg, m.KeyMap.DeleteBeforeCursor):
|
|
|
+ m.col = clamp(m.col, 0, len(m.value[m.row]))
|
|
|
+ if m.col <= 0 {
|
|
|
+ m.mergeLineAbove(m.row)
|
|
|
+ break
|
|
|
+ }
|
|
|
+ m.deleteBeforeCursor()
|
|
|
+ case key.Matches(msg, m.KeyMap.DeleteCharacterBackward):
|
|
|
+ m.col = clamp(m.col, 0, len(m.value[m.row]))
|
|
|
+ if m.col <= 0 {
|
|
|
+ m.mergeLineAbove(m.row)
|
|
|
+ break
|
|
|
+ }
|
|
|
+ if len(m.value[m.row]) > 0 {
|
|
|
+ m.value[m.row] = append(m.value[m.row][:max(0, m.col-1)], m.value[m.row][m.col:]...)
|
|
|
+ if m.col > 0 {
|
|
|
+ m.SetCursorColumn(m.col - 1)
|
|
|
+ }
|
|
|
+ }
|
|
|
+ case key.Matches(msg, m.KeyMap.DeleteCharacterForward):
|
|
|
+ if len(m.value[m.row]) > 0 && m.col < len(m.value[m.row]) {
|
|
|
+ m.value[m.row] = slices.Delete(m.value[m.row], m.col, m.col+1)
|
|
|
+ }
|
|
|
+ if m.col >= len(m.value[m.row]) {
|
|
|
+ m.mergeLineBelow(m.row)
|
|
|
+ break
|
|
|
+ }
|
|
|
+ case key.Matches(msg, m.KeyMap.DeleteWordBackward):
|
|
|
+ if m.col <= 0 {
|
|
|
+ m.mergeLineAbove(m.row)
|
|
|
+ break
|
|
|
+ }
|
|
|
+ m.deleteWordLeft()
|
|
|
+ case key.Matches(msg, m.KeyMap.DeleteWordForward):
|
|
|
+ m.col = clamp(m.col, 0, len(m.value[m.row]))
|
|
|
+ if m.col >= len(m.value[m.row]) {
|
|
|
+ m.mergeLineBelow(m.row)
|
|
|
+ break
|
|
|
+ }
|
|
|
+ m.deleteWordRight()
|
|
|
+ case key.Matches(msg, m.KeyMap.InsertNewline):
|
|
|
+ if m.MaxHeight > 0 && len(m.value) >= m.MaxHeight {
|
|
|
+ return m, nil
|
|
|
+ }
|
|
|
+ m.col = clamp(m.col, 0, len(m.value[m.row]))
|
|
|
+ m.splitLine(m.row, m.col)
|
|
|
+ case key.Matches(msg, m.KeyMap.LineEnd):
|
|
|
+ m.CursorEnd()
|
|
|
+ case key.Matches(msg, m.KeyMap.LineStart):
|
|
|
+ m.CursorStart()
|
|
|
+ case key.Matches(msg, m.KeyMap.CharacterForward):
|
|
|
+ m.characterRight()
|
|
|
+ case key.Matches(msg, m.KeyMap.LineNext):
|
|
|
+ m.CursorDown()
|
|
|
+ case key.Matches(msg, m.KeyMap.WordForward):
|
|
|
+ m.wordRight()
|
|
|
+ case key.Matches(msg, m.KeyMap.Paste):
|
|
|
+ return m, Paste
|
|
|
+ case key.Matches(msg, m.KeyMap.CharacterBackward):
|
|
|
+ m.characterLeft(false /* insideLine */)
|
|
|
+ case key.Matches(msg, m.KeyMap.LinePrevious):
|
|
|
+ m.CursorUp()
|
|
|
+ case key.Matches(msg, m.KeyMap.WordBackward):
|
|
|
+ m.wordLeft()
|
|
|
+ case key.Matches(msg, m.KeyMap.InputBegin):
|
|
|
+ m.moveToBegin()
|
|
|
+ case key.Matches(msg, m.KeyMap.InputEnd):
|
|
|
+ m.moveToEnd()
|
|
|
+ case key.Matches(msg, m.KeyMap.LowercaseWordForward):
|
|
|
+ m.lowercaseRight()
|
|
|
+ case key.Matches(msg, m.KeyMap.UppercaseWordForward):
|
|
|
+ m.uppercaseRight()
|
|
|
+ case key.Matches(msg, m.KeyMap.CapitalizeWordForward):
|
|
|
+ m.capitalizeRight()
|
|
|
+ case key.Matches(msg, m.KeyMap.TransposeCharacterBackward):
|
|
|
+ m.transposeLeft()
|
|
|
+
|
|
|
+ default:
|
|
|
+ m.insertRunesFromUserInput([]rune(msg.Text))
|
|
|
+ }
|
|
|
+
|
|
|
+ case pasteMsg:
|
|
|
+ m.insertRunesFromUserInput([]rune(msg))
|
|
|
+
|
|
|
+ case pasteErrMsg:
|
|
|
+ m.Err = msg
|
|
|
+ }
|
|
|
+
|
|
|
+ var cmd tea.Cmd
|
|
|
+ cmds = append(cmds, cmd)
|
|
|
+
|
|
|
+ newRow, newCol := m.cursorLineNumber(), m.col
|
|
|
+ m.virtualCursor, cmd = m.virtualCursor.Update(msg)
|
|
|
+ if (newRow != oldRow || newCol != oldCol) && m.virtualCursor.Mode() == cursor.CursorBlink {
|
|
|
+ m.virtualCursor.Blink = false
|
|
|
+ cmd = m.virtualCursor.BlinkCmd()
|
|
|
+ }
|
|
|
+ cmds = append(cmds, cmd)
|
|
|
+
|
|
|
+ m.SetHeight(m.ContentHeight())
|
|
|
+ return m, tea.Batch(cmds...)
|
|
|
+}
|
|
|
+
|
|
|
+// View renders the text area in its current state.
|
|
|
+func (m Model) View() string {
|
|
|
+ m.updateVirtualCursorStyle()
|
|
|
+ if m.Value() == "" && m.row == 0 && m.col == 0 && m.Placeholder != "" {
|
|
|
+ return m.placeholderView()
|
|
|
+ }
|
|
|
+ m.virtualCursor.TextStyle = m.activeStyle().computedCursorLine()
|
|
|
+
|
|
|
+ var (
|
|
|
+ s strings.Builder
|
|
|
+ style lipgloss.Style
|
|
|
+ newLines int
|
|
|
+ widestLineNumber int
|
|
|
+ lineInfo = m.LineInfo()
|
|
|
+ styles = m.activeStyle()
|
|
|
+ )
|
|
|
+
|
|
|
+ displayLine := 0
|
|
|
+ for l, line := range m.value {
|
|
|
+ wrappedLines := m.memoizedWrap(line, m.width)
|
|
|
+
|
|
|
+ if m.row == l {
|
|
|
+ style = styles.computedCursorLine()
|
|
|
+ } else {
|
|
|
+ style = styles.computedText()
|
|
|
+ }
|
|
|
+
|
|
|
+ for wl, wrappedLine := range wrappedLines {
|
|
|
+ prompt := m.promptView(displayLine)
|
|
|
+ prompt = styles.computedPrompt().Render(prompt)
|
|
|
+ s.WriteString(style.Render(prompt))
|
|
|
+ displayLine++
|
|
|
+
|
|
|
+ var ln string
|
|
|
+ if m.ShowLineNumbers {
|
|
|
+ if wl == 0 { // normal line
|
|
|
+ isCursorLine := m.row == l
|
|
|
+ s.WriteString(m.lineNumberView(l+1, isCursorLine))
|
|
|
+ } else { // soft wrapped line
|
|
|
+ isCursorLine := m.row == l
|
|
|
+ s.WriteString(m.lineNumberView(-1, isCursorLine))
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Note the widest line number for padding purposes later.
|
|
|
+ lnw := uniseg.StringWidth(ln)
|
|
|
+ if lnw > widestLineNumber {
|
|
|
+ widestLineNumber = lnw
|
|
|
+ }
|
|
|
+
|
|
|
+ strwidth := uniseg.StringWidth(string(wrappedLine))
|
|
|
+ padding := m.width - strwidth
|
|
|
+ // If the trailing space causes the line to be wider than the
|
|
|
+ // width, we should not draw it to the screen since it will result
|
|
|
+ // in an extra space at the end of the line which can look off when
|
|
|
+ // the cursor line is showing.
|
|
|
+ if strwidth > m.width {
|
|
|
+ // The character causing the line to be wider than the width is
|
|
|
+ // guaranteed to be a space since any other character would
|
|
|
+ // have been wrapped.
|
|
|
+ wrappedLine = []rune(strings.TrimSuffix(string(wrappedLine), " "))
|
|
|
+ padding -= m.width - strwidth
|
|
|
+ }
|
|
|
+ if m.row == l && lineInfo.RowOffset == wl {
|
|
|
+ s.WriteString(style.Render(string(wrappedLine[:lineInfo.ColumnOffset])))
|
|
|
+ if m.col >= len(line) && lineInfo.CharOffset >= m.width {
|
|
|
+ m.virtualCursor.SetChar(" ")
|
|
|
+ s.WriteString(m.virtualCursor.View())
|
|
|
+ } else {
|
|
|
+ m.virtualCursor.SetChar(string(wrappedLine[lineInfo.ColumnOffset]))
|
|
|
+ s.WriteString(style.Render(m.virtualCursor.View()))
|
|
|
+ s.WriteString(style.Render(string(wrappedLine[lineInfo.ColumnOffset+1:])))
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ s.WriteString(style.Render(string(wrappedLine)))
|
|
|
+ }
|
|
|
+ s.WriteString(style.Render(strings.Repeat(" ", max(0, padding))))
|
|
|
+ s.WriteRune('\n')
|
|
|
+ newLines++
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Remove the trailing newline from the last line
|
|
|
+ result := s.String()
|
|
|
+ if len(result) > 0 && result[len(result)-1] == '\n' {
|
|
|
+ result = result[:len(result)-1]
|
|
|
+ }
|
|
|
+
|
|
|
+ return styles.Base.Render(result)
|
|
|
+}
|
|
|
+
|
|
|
+// promptView renders a single line of the prompt.
|
|
|
+func (m Model) promptView(displayLine int) (prompt string) {
|
|
|
+ prompt = m.Prompt
|
|
|
+ if m.promptFunc == nil {
|
|
|
+ return prompt
|
|
|
+ }
|
|
|
+ prompt = m.promptFunc(displayLine)
|
|
|
+ width := lipgloss.Width(prompt)
|
|
|
+ if width < m.promptWidth {
|
|
|
+ prompt = fmt.Sprintf("%*s%s", m.promptWidth-width, "", prompt)
|
|
|
+ }
|
|
|
+
|
|
|
+ return m.activeStyle().computedPrompt().Render(prompt)
|
|
|
+}
|
|
|
+
|
|
|
+// lineNumberView renders the line number.
|
|
|
+//
|
|
|
+// If the argument is less than 0, a space styled as a line number is returned
|
|
|
+// instead. Such cases are used for soft-wrapped lines.
|
|
|
+//
|
|
|
+// The second argument indicates whether this line number is for a 'cursorline'
|
|
|
+// line number.
|
|
|
+func (m Model) lineNumberView(n int, isCursorLine bool) (str string) {
|
|
|
+ if !m.ShowLineNumbers {
|
|
|
+ return ""
|
|
|
+ }
|
|
|
+
|
|
|
+ if n <= 0 {
|
|
|
+ str = " "
|
|
|
+ } else {
|
|
|
+ str = strconv.Itoa(n)
|
|
|
+ }
|
|
|
+
|
|
|
+ // XXX: is textStyle really necessary here?
|
|
|
+ textStyle := m.activeStyle().computedText()
|
|
|
+ lineNumberStyle := m.activeStyle().computedLineNumber()
|
|
|
+ if isCursorLine {
|
|
|
+ textStyle = m.activeStyle().computedCursorLine()
|
|
|
+ lineNumberStyle = m.activeStyle().computedCursorLineNumber()
|
|
|
+ }
|
|
|
+
|
|
|
+ // Format line number dynamically based on the maximum number of lines.
|
|
|
+ digits := len(strconv.Itoa(m.MaxHeight))
|
|
|
+ str = fmt.Sprintf(" %*v ", digits, str)
|
|
|
+
|
|
|
+ return textStyle.Render(lineNumberStyle.Render(str))
|
|
|
+}
|
|
|
+
|
|
|
+// placeholderView returns the prompt and placeholder, if any.
|
|
|
+func (m Model) placeholderView() string {
|
|
|
+ var (
|
|
|
+ s strings.Builder
|
|
|
+ p = m.Placeholder
|
|
|
+ styles = m.activeStyle()
|
|
|
+ )
|
|
|
+ // word wrap lines
|
|
|
+ pwordwrap := ansi.Wordwrap(p, m.width, "")
|
|
|
+ // hard wrap lines (handles lines that could not be word wrapped)
|
|
|
+ pwrap := ansi.Hardwrap(pwordwrap, m.width, true)
|
|
|
+ // split string by new lines
|
|
|
+ plines := strings.Split(strings.TrimSpace(pwrap), "\n")
|
|
|
+
|
|
|
+ // Only render the actual placeholder lines, not padded to m.height
|
|
|
+ maxLines := max(len(plines), 1) // At least show one line for cursor
|
|
|
+ for i := range maxLines {
|
|
|
+ isLineNumber := len(plines) > i
|
|
|
+
|
|
|
+ lineStyle := styles.computedPlaceholder()
|
|
|
+ if len(plines) > i {
|
|
|
+ lineStyle = styles.computedCursorLine()
|
|
|
+ }
|
|
|
+
|
|
|
+ // render prompt
|
|
|
+ prompt := m.promptView(i)
|
|
|
+ prompt = styles.computedPrompt().Render(prompt)
|
|
|
+ s.WriteString(lineStyle.Render(prompt))
|
|
|
+
|
|
|
+ // when show line numbers enabled:
|
|
|
+ // - render line number for only the cursor line
|
|
|
+ // - indent other placeholder lines
|
|
|
+ // this is consistent with vim with line numbers enabled
|
|
|
+ if m.ShowLineNumbers {
|
|
|
+ var ln int
|
|
|
+
|
|
|
+ switch {
|
|
|
+ case i == 0:
|
|
|
+ ln = i + 1
|
|
|
+ fallthrough
|
|
|
+ case len(plines) > i:
|
|
|
+ s.WriteString(m.lineNumberView(ln, isLineNumber))
|
|
|
+ default:
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ switch {
|
|
|
+ // first line
|
|
|
+ case i == 0:
|
|
|
+ // first character of first line as cursor with character
|
|
|
+ m.virtualCursor.TextStyle = styles.computedPlaceholder()
|
|
|
+ m.virtualCursor.SetChar(string(plines[0][0]))
|
|
|
+ s.WriteString(lineStyle.Render(m.virtualCursor.View()))
|
|
|
+
|
|
|
+ // the rest of the first line
|
|
|
+ placeholderTail := plines[0][1:]
|
|
|
+ gap := strings.Repeat(" ", max(0, m.width-uniseg.StringWidth(plines[0])))
|
|
|
+ renderedPlaceholder := styles.computedPlaceholder().Render(placeholderTail + gap)
|
|
|
+ s.WriteString(lineStyle.Render(renderedPlaceholder))
|
|
|
+ // remaining lines
|
|
|
+ case len(plines) > i:
|
|
|
+ // current line placeholder text
|
|
|
+ if len(plines) > i {
|
|
|
+ placeholderLine := plines[i]
|
|
|
+ gap := strings.Repeat(" ", max(0, m.width-uniseg.StringWidth(plines[i])))
|
|
|
+ s.WriteString(lineStyle.Render(placeholderLine + gap))
|
|
|
+ }
|
|
|
+ default:
|
|
|
+ // end of line buffer character
|
|
|
+ eob := styles.computedEndOfBuffer().Render(string(m.EndOfBufferCharacter))
|
|
|
+ s.WriteString(eob)
|
|
|
+ }
|
|
|
+
|
|
|
+ // terminate with new line (except for last line)
|
|
|
+ if i < maxLines-1 {
|
|
|
+ s.WriteRune('\n')
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return styles.Base.Render(s.String())
|
|
|
+}
|
|
|
+
|
|
|
+// Blink returns the blink command for the virtual cursor.
|
|
|
+func Blink() tea.Msg {
|
|
|
+ return cursor.Blink()
|
|
|
+}
|
|
|
+
|
|
|
+// Cursor returns a [tea.Cursor] for rendering a real cursor in a Bubble Tea
|
|
|
+// program. This requires that [Model.VirtualCursor] is set to false.
|
|
|
+//
|
|
|
+// Note that you will almost certainly also need to adjust the offset cursor
|
|
|
+// position per the textarea's per the textarea's position in the terminal.
|
|
|
+//
|
|
|
+// Example:
|
|
|
+//
|
|
|
+// // In your top-level View function:
|
|
|
+// f := tea.NewFrame(m.textarea.View())
|
|
|
+// f.Cursor = m.textarea.Cursor()
|
|
|
+// f.Cursor.Position.X += offsetX
|
|
|
+// f.Cursor.Position.Y += offsetY
|
|
|
+func (m Model) Cursor() *tea.Cursor {
|
|
|
+ if m.VirtualCursor {
|
|
|
+ return nil
|
|
|
+ }
|
|
|
+
|
|
|
+ lineInfo := m.LineInfo()
|
|
|
+ w := lipgloss.Width
|
|
|
+ baseStyle := m.activeStyle().Base
|
|
|
+
|
|
|
+ xOffset := lineInfo.CharOffset +
|
|
|
+ w(m.promptView(0)) +
|
|
|
+ w(m.lineNumberView(0, false)) +
|
|
|
+ baseStyle.GetMarginLeft() +
|
|
|
+ baseStyle.GetPaddingLeft() +
|
|
|
+ baseStyle.GetBorderLeftSize()
|
|
|
+
|
|
|
+ yOffset := m.cursorLineNumber() -
|
|
|
+ baseStyle.GetMarginTop() +
|
|
|
+ baseStyle.GetPaddingTop() +
|
|
|
+ baseStyle.GetBorderTopSize()
|
|
|
+
|
|
|
+ c := tea.NewCursor(xOffset, yOffset)
|
|
|
+ c.Blink = m.Styles.Cursor.Blink
|
|
|
+ c.Color = m.Styles.Cursor.Color
|
|
|
+ c.Shape = m.Styles.Cursor.Shape
|
|
|
+ return c
|
|
|
+}
|
|
|
+
|
|
|
+func (m Model) memoizedWrap(runes []rune, width int) [][]rune {
|
|
|
+ input := line{runes: runes, width: width}
|
|
|
+ if v, ok := m.cache.Get(input); ok {
|
|
|
+ return v
|
|
|
+ }
|
|
|
+ v := wrap(runes, width)
|
|
|
+ m.cache.Set(input, v)
|
|
|
+ return v
|
|
|
+}
|
|
|
+
|
|
|
+// cursorLineNumber returns the line number that the cursor is on.
|
|
|
+// This accounts for soft wrapped lines.
|
|
|
+func (m Model) cursorLineNumber() int {
|
|
|
+ line := 0
|
|
|
+ for i := range m.row {
|
|
|
+ // Calculate the number of lines that the current line will be split
|
|
|
+ // into.
|
|
|
+ line += len(m.memoizedWrap(m.value[i], m.width))
|
|
|
+ }
|
|
|
+ line += m.LineInfo().RowOffset
|
|
|
+ return line
|
|
|
+}
|
|
|
+
|
|
|
+// mergeLineBelow merges the current line the cursor is on with the line below.
|
|
|
+func (m *Model) mergeLineBelow(row int) {
|
|
|
+ if row >= len(m.value)-1 {
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ // To perform a merge, we will need to combine the two lines and then
|
|
|
+ m.value[row] = append(m.value[row], m.value[row+1]...)
|
|
|
+
|
|
|
+ // Shift all lines up by one
|
|
|
+ for i := row + 1; i < len(m.value)-1; i++ {
|
|
|
+ m.value[i] = m.value[i+1]
|
|
|
+ }
|
|
|
+
|
|
|
+ // And, remove the last line
|
|
|
+ if len(m.value) > 0 {
|
|
|
+ m.value = m.value[:len(m.value)-1]
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+// mergeLineAbove merges the current line the cursor is on with the line above.
|
|
|
+func (m *Model) mergeLineAbove(row int) {
|
|
|
+ if row <= 0 {
|
|
|
+ return
|
|
|
+ }
|
|
|
+
|
|
|
+ m.col = len(m.value[row-1])
|
|
|
+ m.row = m.row - 1
|
|
|
+
|
|
|
+ // To perform a merge, we will need to combine the two lines and then
|
|
|
+ m.value[row-1] = append(m.value[row-1], m.value[row]...)
|
|
|
+
|
|
|
+ // Shift all lines up by one
|
|
|
+ for i := row; i < len(m.value)-1; i++ {
|
|
|
+ m.value[i] = m.value[i+1]
|
|
|
+ }
|
|
|
+
|
|
|
+ // And, remove the last line
|
|
|
+ if len(m.value) > 0 {
|
|
|
+ m.value = m.value[:len(m.value)-1]
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+func (m *Model) splitLine(row, col int) {
|
|
|
+ // To perform a split, take the current line and keep the content before
|
|
|
+ // the cursor, take the content after the cursor and make it the content of
|
|
|
+ // the line underneath, and shift the remaining lines down by one
|
|
|
+ head, tailSrc := m.value[row][:col], m.value[row][col:]
|
|
|
+ tail := make([]rune, len(tailSrc))
|
|
|
+ copy(tail, tailSrc)
|
|
|
+
|
|
|
+ m.value = append(m.value[:row+1], m.value[row:]...)
|
|
|
+
|
|
|
+ m.value[row] = head
|
|
|
+ m.value[row+1] = tail
|
|
|
+
|
|
|
+ m.col = 0
|
|
|
+ m.row++
|
|
|
+}
|
|
|
+
|
|
|
+// Paste is a command for pasting from the clipboard into the text input.
|
|
|
+func Paste() tea.Msg {
|
|
|
+ str, err := clipboard.ReadAll()
|
|
|
+ if err != nil {
|
|
|
+ return pasteErrMsg{err}
|
|
|
+ }
|
|
|
+ return pasteMsg(str)
|
|
|
+}
|
|
|
+
|
|
|
+func wrap(runes []rune, width int) [][]rune {
|
|
|
+ var (
|
|
|
+ lines = [][]rune{{}}
|
|
|
+ word = []rune{}
|
|
|
+ row int
|
|
|
+ spaces int
|
|
|
+ )
|
|
|
+
|
|
|
+ // Word wrap the runes
|
|
|
+ for _, r := range runes {
|
|
|
+ if unicode.IsSpace(r) {
|
|
|
+ spaces++
|
|
|
+ } else {
|
|
|
+ word = append(word, r)
|
|
|
+ }
|
|
|
+
|
|
|
+ if spaces > 0 { //nolint:nestif
|
|
|
+ if uniseg.StringWidth(string(lines[row]))+uniseg.StringWidth(string(word))+spaces > width {
|
|
|
+ row++
|
|
|
+ lines = append(lines, []rune{})
|
|
|
+ lines[row] = append(lines[row], word...)
|
|
|
+ lines[row] = append(lines[row], repeatSpaces(spaces)...)
|
|
|
+ spaces = 0
|
|
|
+ word = nil
|
|
|
+ } else {
|
|
|
+ lines[row] = append(lines[row], word...)
|
|
|
+ lines[row] = append(lines[row], repeatSpaces(spaces)...)
|
|
|
+ spaces = 0
|
|
|
+ word = nil
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ // If the last character is a double-width rune, then we may not be able to add it to this line
|
|
|
+ // as it might cause us to go past the width.
|
|
|
+ lastCharLen := rw.RuneWidth(word[len(word)-1])
|
|
|
+ if uniseg.StringWidth(string(word))+lastCharLen > width {
|
|
|
+ // If the current line has any content, let's move to the next
|
|
|
+ // line because the current word fills up the entire line.
|
|
|
+ if len(lines[row]) > 0 {
|
|
|
+ row++
|
|
|
+ lines = append(lines, []rune{})
|
|
|
+ }
|
|
|
+ lines[row] = append(lines[row], word...)
|
|
|
+ word = nil
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if uniseg.StringWidth(string(lines[row]))+uniseg.StringWidth(string(word))+spaces >= width {
|
|
|
+ lines = append(lines, []rune{})
|
|
|
+ lines[row+1] = append(lines[row+1], word...)
|
|
|
+ // We add an extra space at the end of the line to account for the
|
|
|
+ // trailing space at the end of the previous soft-wrapped lines so that
|
|
|
+ // behaviour when navigating is consistent and so that we don't need to
|
|
|
+ // continually add edges to handle the last line of the wrapped input.
|
|
|
+ spaces++
|
|
|
+ lines[row+1] = append(lines[row+1], repeatSpaces(spaces)...)
|
|
|
+ } else {
|
|
|
+ lines[row] = append(lines[row], word...)
|
|
|
+ spaces++
|
|
|
+ lines[row] = append(lines[row], repeatSpaces(spaces)...)
|
|
|
+ }
|
|
|
+
|
|
|
+ return lines
|
|
|
+}
|
|
|
+
|
|
|
+func repeatSpaces(n int) []rune {
|
|
|
+ return []rune(strings.Repeat(string(' '), n))
|
|
|
+}
|
|
|
+
|
|
|
+// numDigits returns the number of digits in an integer.
|
|
|
+func numDigits(n int) int {
|
|
|
+ if n == 0 {
|
|
|
+ return 1
|
|
|
+ }
|
|
|
+ count := 0
|
|
|
+ num := abs(n)
|
|
|
+ for num > 0 {
|
|
|
+ count++
|
|
|
+ num /= 10
|
|
|
+ }
|
|
|
+ return count
|
|
|
+}
|
|
|
+
|
|
|
+func clamp(v, low, high int) int {
|
|
|
+ if high < low {
|
|
|
+ low, high = high, low
|
|
|
+ }
|
|
|
+ return min(high, max(low, v))
|
|
|
+}
|
|
|
+
|
|
|
+func abs(n int) int {
|
|
|
+ if n < 0 {
|
|
|
+ return -n
|
|
|
+ }
|
|
|
+ return n
|
|
|
+}
|