remember CSI color overrides (fixes #59)

terminus-terminal/src/hterm.ts

@@ -67,6 +67,41 @@ hterm.hterm.VT.CSI[' q'] = function (parseState) {
     this.terminal.applyCursorShape()
 }
 
+hterm.hterm.VT.OSC['4'] = function (parseState) {
+    let args = parseState.args[0].split(';')
+
+    let pairCount = args.length / 2
+    let colorPalette = this.terminal.getTextAttributes().colorPalette
+    let responseArray = []
+
+    for (let pairNumber = 0; pairNumber < pairCount; ++pairNumber) {
+        let colorIndex = parseInt(args[pairNumber * 2])
+        let colorValue = args[pairNumber * 2 + 1]
+
+        if (colorIndex >= colorPalette.length) {
+            continue
+        }
+
+        if (colorValue === '?') {
+            colorValue = hterm.lib.colors.rgbToX11(colorPalette[colorIndex])
+            if (colorValue) {
+                responseArray.push(colorIndex + ';' + colorValue)
+            }
+            continue
+        }
+
+        colorValue = hterm.lib.colors.x11ToCSS(colorValue)
+        if (colorValue) {
+            this.terminal.colorPaletteOverrides[colorIndex] = colorValue
+            colorPalette[colorIndex] = colorValue
+        }
+    }
+
+    if (responseArray.length) {
+        this.terminal.io.sendString('\x1b]4;' + responseArray.join(';') + '\x07')
+    }
+}
+
 const _collapseToEnd = Selection.prototype.collapseToEnd
 Selection.prototype.collapseToEnd = function () {
     try {

terminus-terminal/src/terminalContainers/htermContainer.ts

@@ -85,7 +85,10 @@ export class HTermContainer extends TermContainer {
         }
 
         if (config.terminal.colorScheme.colors) {
-            preferenceManager.set('color-palette-overrides', config.terminal.colorScheme.colors)
+            preferenceManager.set(
+                'color-palette-overrides',
+                Object.assign([], config.terminal.colorScheme.colors, this.term.colorPaletteOverrides)
+            )
         }
         if (config.terminal.colorScheme.cursor) {
             preferenceManager.set('cursor-color', config.terminal.colorScheme.cursor)
@@ -222,5 +225,7 @@ export class HTermContainer extends TermContainer {
             size.height += this.configuredLinePadding
             return size
         }
+
+        this.term.colorPaletteOverrides = []
     }
 }