Add Google Antigravity editor support (agy CLI, workspace-enabled)

Co-authored-by: ivanviragine <9950727+ivanviragine@users.noreply.github.com>

Author: Copilot

README.md

@@ -135,7 +135,7 @@ While `git worktree` is powerful, it's verbose and manual. `git gtr` adds qualit
 - **Simple commands** - Create and manage worktrees with intuitive CLI
 - **Repository-scoped** - Each repo has independent worktrees
 - **Configuration over flags** - Set defaults once, use simple commands
-- **Editor integration** - Open worktrees in Cursor, VS Code, Zed, and more
+- **Editor integration** - Open worktrees in Cursor, VS Code, Antigravity, Zed, and more
 - **AI tool support** - Launch Aider, Claude Code, or other AI coding tools
 - **Smart file copying** - Selectively copy configs/env files to new worktrees
 - **Hooks system** - Run custom commands after create/remove
@@ -323,7 +323,7 @@ All configuration is stored via `git config`. For team settings, create a `.gtrc
 ### Quick Setup
 
 ```bash
-# Set your editor (cursor, vscode, zed)
+# Set your editor (antigravity, cursor, vscode, zed)
 git gtr config set gtr.editor.default cursor
 
 # Set your AI tool (aider, auggie, claude, codex, continue, copilot, cursor, gemini, opencode)

completions/_git-gtr

@@ -121,7 +121,7 @@ _git-gtr() {
   elif (( CURRENT >= 5 )); then
     case "$words[3]" in
       editor)
-        _arguments '--editor[Editor to use]:editor:(atom cursor emacs idea nano none nvim pycharm sublime vim vscode webstorm zed)'
+        _arguments '--editor[Editor to use]:editor:(antigravity atom cursor emacs idea nano none nvim pycharm sublime vim vscode webstorm zed)'
         ;;
       ai)
         _arguments '--ai[AI tool to use]:tool:(aider auggie claude codex continue copilot cursor gemini none opencode)'

completions/git-gtr.fish

@@ -91,7 +91,7 @@ complete -c git -n '__fish_git_gtr_using_command list' -l porcelain -d 'Machine-
 complete -c git -n '__fish_git_gtr_using_command ls' -l porcelain -d 'Machine-readable output'
 
 # Editor command options
-complete -c git -n '__fish_git_gtr_using_command editor' -l editor -d 'Editor to use' -r -a 'atom cursor emacs idea nano none nvim pycharm sublime vim vscode webstorm zed'
+complete -c git -n '__fish_git_gtr_using_command editor' -l editor -d 'Editor to use' -r -a 'antigravity atom cursor emacs idea nano none nvim pycharm sublime vim vscode webstorm zed'
 
 # AI command options
 complete -c git -n '__fish_git_gtr_using_command ai' -l ai -d 'AI tool to use' -r -a 'aider auggie claude codex continue copilot cursor gemini none opencode'
@@ -139,7 +139,7 @@ complete -f -c git -n '__fish_git_gtr_using_command config' -a "
   gtr.worktrees.prefix	'Worktree folder prefix'
   gtr.defaultBranch	'Default branch'
   gtr.provider	'Hosting provider (github, gitlab)'
-  gtr.ui.color	'Color output mode (auto, always, never)'
+  gtr.ui.color	'gtr.ui.color'
 "
 
 # Helper function to get branch names and special '1' for main repo

completions/gtr.bash

@@ -55,7 +55,7 @@ _git_gtr() {
       if [[ "$cur" == -* ]]; then
         COMPREPLY=($(compgen -W "--editor" -- "$cur"))
       elif [ "$prev" = "--editor" ]; then
-        COMPREPLY=($(compgen -W "atom cursor emacs idea nano none nvim pycharm sublime vim vscode webstorm zed" -- "$cur"))
+        COMPREPLY=($(compgen -W "antigravity atom cursor emacs idea nano none nvim pycharm sublime vim vscode webstorm zed" -- "$cur"))
       else
         local branches all_options
         branches=$(git branch --format='%(refname:short)' 2>/dev/null || true)

docs/configuration.md

@@ -134,10 +134,10 @@ git gtr config set gtr.provider github
 ## Editor Settings
 
 ```bash
-# Default editor: cursor, vscode, zed, or none
+# Default editor: antigravity, cursor, vscode, zed, or none
 gtr.editor.default = cursor
 
-# Workspace file for VS Code/Cursor (relative path from worktree root)
+# Workspace file for Antigravity/VS Code/Cursor (relative path from worktree root)
 # If set, opens the workspace file instead of the folder
 # If not set, auto-detects *.code-workspace files in worktree root
 # Set to "none" to disable workspace lookup entirely
@@ -146,13 +146,14 @@ gtr.editor.workspace = project.code-workspace
 
 **Setup editors:**
 
+- **Antigravity**: Install from [antigravity.google](https://antigravity.google), `agy` command available after installation
 - **Cursor**: Install from [cursor.com](https://cursor.com), enable shell command
 - **VS Code**: Install from [code.visualstudio.com](https://code.visualstudio.com), enable `code` command
 - **Zed**: Install from [zed.dev](https://zed.dev), `zed` command available automatically
 
 **Workspace files:**
 
-VS Code and Cursor support `.code-workspace` files for multi-root workspaces, custom settings, and recommended extensions. When opening a worktree:
+Antigravity, VS Code, and Cursor support `.code-workspace` files for multi-root workspaces, custom settings, and recommended extensions. When opening a worktree:
 
 1. If `gtr.editor.workspace` is set to a path, opens that file (relative to worktree root)
 2. If set to `none`, disables workspace lookup (always opens folder)

lib/adapters.sh

@@ -17,6 +17,7 @@
 #
 # Loading: file override (adapters/editor/<name>.sh) → registry → generic PATH fallback
 _EDITOR_REGISTRY="
+antigravity|agy|standard|Antigravity 'agy' command not found. Install from https://antigravity.google|workspace
 atom|atom|standard|Atom not found. Install from https://atom.io|
 cursor|cursor|standard|Cursor not found. Install from https://cursor.com or enable the shell command.|workspace
 emacs|emacs|terminal|Emacs not found. Install from https://www.gnu.org/software/emacs/|background
@@ -252,7 +253,7 @@ _editor_define_terminal() {
   }
 }
 
-# Resolve workspace file for VS Code/Cursor editors
+# Resolve workspace file for Antigravity/VS Code/Cursor editors
 # Returns the workspace file path if found, empty otherwise
 resolve_workspace_file() {
   local worktree_path="$1"

lib/commands/help.sh

@@ -56,8 +56,8 @@ Special:
   Use '1' to open the main repo root: git gtr editor 1
 
 Available editors:
-  atom, cursor, emacs, idea, nano, nvim, pycharm, sublime, vim, vscode,
-  webstorm, zed, none (or any command in your PATH)
+  antigravity, atom, cursor, emacs, idea, nano, nvim, pycharm, sublime,
+  vim, vscode, webstorm, zed, none (or any command in your PATH)
 
 Examples:
   git gtr editor my-feature                     # Uses default editor
@@ -593,10 +593,10 @@ CONFIGURATION OPTIONS:
   gtr.worktrees.prefix     Worktree folder prefix (default: "")
   gtr.defaultBranch        Default branch (default: auto)
   gtr.editor.default       Default editor
-                           Options: cursor, vscode, zed, idea, pycharm,
-                           webstorm, vim, nvim, emacs, sublime, nano,
-                           atom, none
-  gtr.editor.workspace     Workspace file for VS Code/Cursor
+                           Options: antigravity, cursor, vscode, zed, idea,
+                           pycharm, webstorm, vim, nvim, emacs, sublime,
+                           nano, atom, none
+  gtr.editor.workspace     Workspace file for Antigravity/VS Code/Cursor
                            (relative path, auto-detects, or "none")
   gtr.ai.default           Default AI tool
                            Options: aider, auggie, claude, codex, continue,