feat(ui): add yank register copy action (#3)

* feat(ui): add yank register copy action

- add "[y] Copy to yank register" action in UI content
- map "y" key to copy commit message to yank register with notification

* docs(ui): update documentation for yank register support

- add references to yank register in README and help docs
- document new `y` keymap for copying to yank register
- clarify clipboard and yank register functionality in UI descriptions
- update feature lists to include yank register support

Closes #123

Author: jinzhongjia

README.md

@@ -5,7 +5,7 @@ A CodeCompanion extension that generates AI-powered git commit messages followin
 ## Features
 
 - 🤖 AI-powered commit message generation using CodeCompanion's LLM adapters
-- 📋 Interactive UI with copy and commit options
+- 📋 Interactive UI with copy to clipboard and yank register options
 - ✅ Conventional Commits specification compliance
 - 🔍 Automatic git repository detection
 - 📝 Support for both user commands and slash commands
@@ -128,8 +128,8 @@ Manages LLM interaction:
 Provides interactive user interface:
 
 - Floating window display with markdown formatting
-- Interactive keyboard shortcuts (`c`, `s`, `Enter`, `q/Esc`)
-- Copy to clipboard functionality
+- Interactive keyboard shortcuts (`c`, `y`, `s`, `Enter`, `q/Esc`)
+- Copy to clipboard and yank register functionality
 - Responsive window sizing
 
 ### `buffer.lua`
@@ -176,10 +176,21 @@ Main extension coordinator:
 3. Review the generated commit message in the floating window
 4. Choose an action:
    - `c` - Copy to clipboard
+   - `y` - Copy to yank register
    - `s` - Submit (commit changes)
    - `Enter` - Copy and close
    - `q/Esc` - Close without action
 
+### Interactive Keymaps
+
+When the floating window is displayed with the generated commit message, the following keymaps are available:
+
+- **`c`** - Copy the commit message to the system clipboard (`+` register)
+- **`y`** - Copy the commit message to Vim's default yank register (`"` register)
+- **`s`** - Submit the commit message immediately (executes `git commit`)
+- **`Enter`** - Copy to clipboard and close the floating window
+- **`q` or `Esc`** - Close the floating window without taking any action
+
 ### GitCommit Buffer Workflow
 1. Stage your changes with `git add`
 2. Run `git commit` to open the commit buffer

doc/codecompanion-gitcommit.txt

@@ -31,7 +31,7 @@ analyze your staged changes and create appropriate commit messages.
 2. FEATURES					*codecompanion-gitcommit-features*
 
 • AI-powered commit message generation using CodeCompanion's LLM adapters
-• Interactive UI with copy and commit options
+• Interactive UI with copy to clipboard and yank register options
 • Conventional Commits specification compliance
 • Automatic git repository detection
 • Support for both user commands and slash commands
@@ -154,6 +154,7 @@ Traditional Workflow:~
 3. Review the generated commit message in the floating window
 4. Choose an action:
    • `c` - Copy to clipboard
+   • `y` - Copy to yank register
    • `s` - Submit (commit changes)
    • `Enter` - Copy and close
    • `q/Esc` - Close without action
@@ -174,6 +175,31 @@ Amend Workflow:~
    appropriate message
 6. Edit if needed and save to complete the amend
 
+5.5 Interactive Keymaps				*codecompanion-gitcommit-keymaps*
+
+When the floating window is displayed with the generated commit message,
+the following keymaps are available:
+
+`c`						*gitcommit-keymap-c*
+	Copy the commit message to the system clipboard. This uses the `+` 
+	register and also copies to `*` register if clipboard support is 
+	available.
+
+`y`						*gitcommit-keymap-y*
+	Copy the commit message to Vim's default yank register (`"`). This
+	allows you to paste the message using `p` or `P` commands within Vim.
+
+`s`						*gitcommit-keymap-s*
+	Submit the commit message immediately. This will execute `git commit`
+	with the generated message and close the floating window if successful.
+
+`<Enter>`					*gitcommit-keymap-enter*
+	Copy the commit message to clipboard (same as `c`) and close the 
+	floating window.
+
+`q` or `<Esc>`					*gitcommit-keymap-q*
+	Close the floating window without taking any action.
+
 ==============================================================================
 6. COMMANDS					*codecompanion-gitcommit-commands*
 
@@ -278,7 +304,7 @@ generator.lua~
 ui.lua~
 	Provides interactive user interface including floating window display
 	with markdown formatting, interactive keyboard shortcuts, copy to 
-	clipboard functionality, and responsive window sizing.
+	clipboard and yank register functionality, and responsive window sizing.
 
 buffer.lua~
 	Handles gitcommit buffer integration including automatic keymap setup

lua/codecompanion/_extensions/gitcommit/generator.lua

@@ -83,11 +83,21 @@ Please only return a commit message that strictly follows the Conventional Commi
 4. Body (optional): use bullet points (-) to list specific changes
 
 Example format:
+
 feat(scope): add new feature
+
 - implement X functionality
 - update Y module
 - add tests for Z
 
+The message need follow this :
+
+<type>(<scope>): <subject>
+<BLANK LINE>
+<body>
+<BLANK LINE>
+<footer>
+
 Note: You need to answer in %s.
 
 Based on the git diff provided below, generate a standardized commit message.

lua/codecompanion/_extensions/gitcommit/ui.lua

@@ -54,6 +54,7 @@ function UI._prepare_content(message)
   table.insert(content, "## Actions")
   table.insert(content, "")
   table.insert(content, "- **[c]** Copy to clipboard")
+  table.insert(content, "- **[y]** Copy to yank register")
   table.insert(content, "- **[s]** Submit (commit changes)")
   table.insert(content, "- **[Enter]** Copy and close")
   table.insert(content, "- **[q/Esc]** Close")
@@ -126,12 +127,17 @@ function UI._setup_keymaps(buf, win, message, on_commit)
     vim.api.nvim_win_close(win, true)
   end, opts)
 
-  -- Copy to clipboard
   vim.keymap.set("n", "c", function()
     copy_to_clipboard(message)
     vim.notify("📋 Commit message copied to clipboard", vim.log.levels.INFO)
   end, opts)
 
+  -- Copy to yank register
+  vim.keymap.set("n", "y", function()
+    vim.fn.setreg('"', message)
+    vim.notify("📝 Commit message copied to yank register", vim.log.levels.INFO)
+  end, opts)
+
   -- Submit commit
   vim.keymap.set("n", "s", function()
     local success = on_commit(message)