Support system light and dark themes in Ghostty, Pi, and Bash

bash/.bash/prompt

@@ -81,13 +81,22 @@ prompt_leading_padding() {
     [[ -z "$VIRTUAL_ENV" || -z "$DIRENV_DIR" ]] && printf ' '
 }
 
-# Use Dracula+'s ANSI palette. A subtly lighter surface separates the prompt
-# context segments from the terminal background.
-BACKGROUND="\e[48;2;40;42;54m"
-VENV_STYLE="${BACKGROUND}\e[38;5;1m" # red
-GIT_STYLE="${BACKGROUND}\e[38;5;6m"  # cyan
-PATH_STYLE="${BACKGROUND}\e[38;5;15m" # foreground
-PROMPT_FG="\e[1;38;5;15m"             # foreground
+# Match Ghostty's system appearance with a subtly filled context strip.
+# macOS leaves AppleInterfaceStyle unset in light mode. Check once per prompt;
+# other platforms retain the dark background without querying the terminal.
+prompt_background() {
+    if [[ "$OSTYPE" == darwin* ]] && [[ "$(defaults read -g AppleInterfaceStyle 2>/dev/null)" != Dark ]]; then
+        printf '\e[48;2;230;233;239m' # Catppuccin Latte mantle (#e6e9ef)
+    else
+        printf '\e[48;2;40;42;54m' # Dracula gray (#282a36)
+    fi
+}
+
+# Foreground colors still follow the terminal's current palette.
+VENV_STYLE="\e[31m"  # red
+GIT_STYLE="\e[36m"   # cyan
+PATH_STYLE="\e[39m"  # default foreground
+PROMPT_FG="\e[1;39m" # bold default foreground
 RESET="\e[0m"
 
 # ============================================================================
@@ -98,9 +107,9 @@ fi
 
 # Variables must be outside single quotes so their escape sequences expand while
 # the command substitutions remain dynamic for every prompt.
-PS1='\['"${PATH_STYLE}"'\]$(prompt_leading_padding)'
+PS1='\[$(prompt_background)'"${PATH_STYLE}"'\]$(prompt_leading_padding)'
 PS1+='\['"${VENV_STYLE}"'\]$(prompt_venv)'
 PS1+='\['"${GIT_STYLE}"'\]$(prompt_git_branch)'
-PS1+='\['"${PATH_STYLE}"'\]\w\e[K'
+PS1+='\['"${PATH_STYLE}"'\]\w\[\e[K\]'
 PS1+='\['"${RESET}"'\]'
 PS1+='\n\['"${PROMPT_FG}"'\] λ \['"${RESET}"'\]'

ghostty/.config/ghostty/config

@@ -13,7 +13,8 @@
 
 # theme = Zenbones Dark
 # theme = Carbonfox
-theme = Dracula+
+# Follow the system appearance, preserving Dracula+ in dark mode.
+theme = light:Catppuccin Latte,dark:Dracula+
 
 # Keep typography explicit so the terminal looks the same on every machine.
 # On macOS: `brew install --cask font-iosevka`

pi/.pi/agent/packages/pi-minimal-prompt/README.md

@@ -24,4 +24,6 @@ Once published to npm:
 pi install npm:pi-minimal-prompt
 ```
 
-The package is designed for the Dracula+ theme and does not bundle it.
+The prompt and status bar follow Pi's active theme. Set `"theme": "system"` in
+`~/.pi/agent/settings.json` to follow the terminal palette, including live
+light/dark appearance changes. No theme is bundled.

pi/.pi/agent/packages/pi-minimal-prompt/extensions/editor.ts

@@ -12,13 +12,6 @@ import {
   visibleWidth,
 } from "@earendil-works/pi-tui";
 
-// Dracula+ colors shared with the Bash prompt and Ghostty theme.
-const STATUS_BACKGROUND = "\x1b[48;2;40;42;54m";
-const STATUS_WHITE = "\x1b[38;2;248;248;242m";
-const STATUS_RED = "\x1b[38;2;255;110;110m";
-const STATUS_CYAN = "\x1b[38;2;139;233;253m";
-const STATUS_GIT = "\x1b[38;5;6m";
-const STATUS_MUTED = "\x1b[38;2;98;114;164m";
 const HOME_DIRECTORY = homedir();
 
 function displayPath(path: string): string {
@@ -50,17 +43,6 @@ function scrollLabel(line: string): string | undefined {
   return stripAnsi(line).match(/([↑↓]\s+\d+\s+more)/)?.[1];
 }
 
-function statusForeground(color: string, text: string): string {
-  return `${color}${text}\x1b[39m`;
-}
-
-function statusBackground(text: string): string {
-  return `${STATUS_BACKGROUND}${text.replace(
-    /\x1b\[0m/g,
-    `\x1b[0m${STATUS_BACKGROUND}`,
-  )}\x1b[49m`;
-}
-
 function alignStatus(left: string, right: string, width: number): string {
   let leftText = left;
   let rightText = right;
@@ -106,29 +88,29 @@ class StatusEditor extends CustomEditor {
     const usage = this.ctx.getContextUsage();
     const context = usage ? `${Math.round(usage.percent)}%` : "";
     const contextForeground = (usage?.percent ?? 0) >= 90
-      ? STATUS_RED
-      : STATUS_WHITE;
+      ? "error"
+      : "text";
 
     const cost = this.ctx.sessionManager.getBranch().reduce((total, entry) => {
       if (entry.type !== "message" || entry.message.role !== "assistant") return total;
       return total + entry.message.usage.cost.total;
     }, 0);
     const delimiter = " ";
-    const modelLabel = statusForeground(
-      STATUS_WHITE,
+    const modelLabel = theme.fg(
+      "text",
       thinking ? `${model} (${thinking})` : model,
     );
-    const usageLabel = context ? statusForeground(contextForeground, context) : "";
-    const costLabel = statusForeground(contextForeground, `$${cost.toFixed(2)}`);
+    const usageLabel = context ? theme.fg(contextForeground, context) : "";
+    const costLabel = theme.fg(contextForeground, `$${cost.toFixed(2)}`);
     const viewportLabel = [
       scrollLabel(base[0] ?? ""),
       scrollLabel(base[bottom] ?? ""),
     ].filter(Boolean).join(delimiter);
     const gitBranch = this.getGitBranch();
     const leftLabel = [
-      gitBranch ? statusForeground(STATUS_GIT, gitBranch) : "",
-      this.ctx.cwd ? statusForeground(STATUS_WHITE, displayPath(this.ctx.cwd)) : "",
-      viewportLabel ? statusForeground(STATUS_MUTED, viewportLabel) : "",
+      gitBranch ? theme.fg("accent", gitBranch) : "",
+      this.ctx.cwd ? theme.fg("text", displayPath(this.ctx.cwd)) : "",
+      viewportLabel ? theme.fg("dim", viewportLabel) : "",
     ].filter(Boolean).join(delimiter);
     const rightLabel = [
       modelLabel,
@@ -155,7 +137,8 @@ class StatusEditor extends CustomEditor {
     const promptSpacer = theme.bg("userMessageBg", " ".repeat(width));
 
     return [
-      statusBackground(status),
+      // Keep the status bar on the terminal's current background.
+      `\x1b[49m${status}`,
       promptSpacer,
       ...promptLines,
       ...autocompleteLines,

pi/.pi/agent/settings.json

@@ -9,7 +9,7 @@
     "./packages/pi-remote"
   ],
   "defaultThinkingLevel": "medium",
-  "theme": "dracula-plus",
+  "theme": "system",
   "hideThinkingBlock": true,
   "treeFilterMode": "no-tools",
   "outputPad": 0,