Change the :J describe behaviour to open an editable buffer instead of an input box (#6)

Co-authored-by: fautore <fautore@protonmail.com>

README.md

@@ -16,7 +16,7 @@ This plugin aims to be something like vim-fugitive but for driving the jj-vcs CL
 - Terminal-based output display for jj commands
 - Support jj subcommands including your aliases through the cmdline.
 - First class citizens with ui integration
-  - `describe` - Set change descriptions
+  - `describe` - Set change descriptions with a Git-style commit message editor
   - `status` / `st` - Show repository status
   - `log` - Display log history with configurable options
   - `diff` - Show changes
@@ -91,11 +91,66 @@ The plugin provides a `:J` command that accepts jj subcommands:
     snacks = {
 
     }
+  },
+  
+  -- Choose the editor mode for describe command
+  -- "buffer" - Opens a Git-style commit message buffer with syntax highlighting (default)
+  -- "input" - Uses a simple vim.ui.input prompt
+  describe_editor = "buffer",
+
+  -- Customize syntax highlighting colors for the describe buffer
+  highlights = {
+    added = { fg = "#3fb950", ctermfg = "Green" },      -- Added files
+    modified = { fg = "#56d4dd", ctermfg = "Cyan" },    -- Modified files
+    deleted = { fg = "#f85149", ctermfg = "Red" },      -- Deleted files
+    renamed = { fg = "#d29922", ctermfg = "Yellow" },   -- Renamed files
   }
 }
 
 ```
 
+### Describe Editor Modes
+
+The `describe_editor` option lets you choose how you want to write commit descriptions:
+
+- **`"buffer"`** (default) - Opens a full buffer editor similar to Git's commit message editor
+  - Shows file changes with syntax highlighting
+  - Multi-line editing with proper formatting
+  - Close with `q` or `<Esc>`, save with `:w` or `:wq`
+  
+- **`"input"`** - Simple single-line input prompt
+  - Quick and minimal
+  - Good for short, single-line descriptions
+  - Uses `vim.ui.input()` which can be customized by UI plugins like dressing.nvim
+
+Example:
+```lua
+require("jj").setup({
+  describe_editor = "input", -- Use simple input mode
+})
+```
+
+### Highlight Customization
+
+The `highlights` option allows you to customize the colors used in the describe buffer's file status display. Each highlight accepts standard Neovim highlight attributes:
+
+- `fg` - Foreground color (hex or color name)
+- `bg` - Background color
+- `ctermfg` - Terminal foreground color
+- `ctermbg` - Terminal background color
+- `bold`, `italic`, `underline` - Text styles
+
+Example with custom colors:
+
+```lua
+require("jj").setup({
+  highlights = {
+    modified = { fg = "#89ddff", bold = true },
+    added = { fg = "#c3e88d", ctermfg = "LightGreen" },
+  }
+})
+```
+
 ## Example config
 
 ```lua
@@ -105,35 +160,38 @@ The plugin provides a `:J` command that accepts jj subcommands:
     "folke/snacks.nvim", -- Optional only if you use picker's
   },
   config = function()
-    require("jj").setup({})
-    local cmd = require "jj.cmd"
-    vim.keymap.set("n", "<leader>jd", cmd.describe, { desc = "JJ describe" })
-    vim.keymap.set("n", "<leader>jl", cmd.log, { desc = "JJ log" })
-    vim.keymap.set("n", "<leader>je", cmd.edit, { desc = "JJ edit" })
-    vim.keymap.set("n", "<leader>jn", cmd.new, { desc = "JJ new" })
-    vim.keymap.set("n", "<leader>js", cmd.status, { desc = "JJ status" })
-    vim.keymap.set("n", "<leader>dj", cmd.diff, { desc = "JJ diff" })
-    vim.keymap.set("n", "<leader>sj", cmd.squash, { desc = "JJ squash" })
+    require("jj").setup({
+      highlights = {
+        -- Customize colors if desired
+        modified = { fg = "#89ddff" },
+      }
+    })
+
+    -- Use the exposed functions directly from the main module
+    local jj = require("jj")
+    vim.keymap.set("n", "<leader>jd", jj.describe, { desc = "JJ describe" })
+    vim.keymap.set("n", "<leader>jl", jj.log, { desc = "JJ log" })
+    vim.keymap.set("n", "<leader>je", jj.edit, { desc = "JJ edit" })
+    vim.keymap.set("n", "<leader>jn", jj.new, { desc = "JJ new" })
+    vim.keymap.set("n", "<leader>js", jj.status, { desc = "JJ status" })
+    vim.keymap.set("n", "<leader>dj", jj.diff, { desc = "JJ diff" })
+    vim.keymap.set("n", "<leader>sj", jj.squash, { desc = "JJ squash" })
 
     -- Pickers
-    vim.keymap.set("n", "<leader>gj", function()
-        require("jj.picker").status()
-    end, { desc = "JJ Picker status" })
-    vim.keymap.set("n", "<leader>gl", function()
-        require("jj.picker").file_history()
-    end, { desc = "JJ Picker file history" })
-
-
+    local picker = require("jj.picker")
+    vim.keymap.set("n", "<leader>gj", picker.status, { desc = "JJ Picker status" })
+    vim.keymap.set("n", "<leader>gl", picker.file_history, { desc = "JJ Picker file history" })
 
     -- Some functions like `describe` or `log` can take parameters
-    vim.keymap.set("n", "<leader>jl", function()
-      cmd.log {
+    vim.keymap.set("n", "<leader>jL", function()
+      jj.log {
         revisions = "all()",
       }
-    end, { desc = "JJ log" })
+    end, { desc = "JJ log all" })
 
     -- This is an alias i use for moving bookmarks its so good
     vim.keymap.set("n", "<leader>jt", function()
+      local cmd = require("jj.cmd")
       cmd.j "tug"
       cmd.log {}
     end, { desc = "JJ tug" })