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git-messenger.vim
=================
[![Build Status][ci-badge]][ci]
[![codecov][codecov-badge]][codecov]
[git-messenger.vim][repo] is a Vim/Neovim plugin to reveal the hidden message from Git under the
cursor quickly. It shows the history of commits under the cursor in popup window.
This plugin shows the message of the last commit in a 'popup window'. If the last commit is not
convenient, you can explore older commits in the popup window. Additionally you can also check diff
of the commit.
The popup window is implemented in
- Floating window on Neovim (0.4 or later)
- Preview window on Vim (8 or later) or Neovim (0.3 or earlier)
The floating window is definitely recommended since it can shows the information near the cursor.
I wrote [a Japanese blogpost for this plugin](https://rhysd.hatenablog.com/entry/2019/03/10/230119).
## Why?
When you're modifying unfamiliar codes, you would sometimes wonder 'why was this line added?' or
'why this value was chosen?' in the source code. The answer sometimes lays in a commit message,
especially in message of the last commit which modifies the line.
## Screenshot
#### Show popup window with Neovim v0.4.0-dev
<img alt="main screenshot" src="https://github.com/rhysd/ss/blob/master/git-messenger.vim/demo.gif?raw=true" width=763 height=556 />
#### Exploring older commits
<img alt="history screenshot" src="https://github.com/rhysd/ss/blob/master/git-messenger.vim/history.gif?raw=true" width=510 height=252 />
#### Exploring diff of the commit (you may be also interested in `g:git_messenger_include_diff`)
<img alt="diff screenshot" src="https://github.com/rhysd/ss/blob/master/git-messenger.vim/diff.gif?raw=true" width=742 height=492 />
#### Switching unified diffs and word diffs
<img alt="word diff screenshot" src="https://github.com/rhysd/ss/blob/master/git-messenger.vim/worddiff.gif?raw=true" width=661 height=492 />
## Installation
Please ensure the following requirement before installing this plugin.
- Git v1.8.5 or later (for `-C` option of `git` command)
If you use any package manager, please follow its instruction.
With [vim-plug](https://github.com/junegunn/vim-plug):
```vim
Plug 'rhysd/git-messenger.vim'
```
With [dein.vim](https://github.com/Shougo/dein.vim):
```vim
call dein#add('rhysd/git-messenger.vim', {
\ 'lazy' : 1,
\ 'on_cmd' : 'GitMessenger',
\ 'on_map' : '<Plug>(git-messenger)',
\ })
```
With [minpac](https://github.com/k-takata/minpac):
```vim
call minpac#add('rhysd/git-messenger.vim')
```
if you use Vim's builtin packager, please follow the instruction at `:help pack-add`.
To enable a floating window support, you need to install Neovim 0.4 or later.
Please follow [the official instruction][nvim-install].
To check if Neovim's floating window feature is available, try `:checkhealth`.
## Usage
Only one mapping (or one command) provides all features of this plugin. Briefly, move cursor to
the position and run `:GitMessenger` or `<Leader>gm`. If you see an error message, please try
[health check](#health-check).
### Commands
```
:GitMessenger
```
Behavior of this command is depending on the situation. You can do every operations only with this
mapping.
- Normally, it opens a popup window with the last commit message
- When a popup window is already open, it moves cursor into the window
- When a cursor is within a popup window, it closes the window
It opens a popup window with the last commit message which modified the line at cursor. The popup
window shows following contents:
- **History:** `History: {page number}` In popup window, `o`/`O` navigates to previous/next commit.
- **Commit:** `Commit: {hash}` The commit hash
- **Author:** `Author: {name}<{email}>` Author name and mail address of the commit
- **Committer:** `Committer: {name}<{email}>` Committer name and mail address of the commit when
committer is different from author
- **Date:** `Date: {date}` Author date of the commit in system format
- When a committer date and an author date are different (e.g. the commit was created again with
`git commit --amend`), both **Author Date:** and **Committer Date:** are shown.
- **Summary:** First line after `Date:` header line is a summary of commit
- **Body:** After summary, commit body is put (if the commit has body)
The popup window will be automatically closed when you move the cursor so you don't need to close
it manually.
Running this command while a popup window is open, it moves the cursor into the window.
This behavior is useful when the commit message is too long and window cannot show the whole content.
By moving the cursor into the popup window, you can see the rest of contents by scrolling it.
You can also see the older commits.
Following mappings are defined within popup window.
| Mapping | Description |
|---------|--------------------------------------------------------------|
| `q` | Close the popup window |
| `o` | **o**lder. Back to older commit at the line |
| `O` | Opposite to `o`. Forward to newer commit at the line |
| `d` | Toggle unified diff hunks only in current file of the commit |
| `D` | Toggle all unified diff hunks of the commit |
| `r` | Toggle word diff hunks only in current file of the commit |
| `R` | Toggle all word diff hunks of current commit |
| `?` | Show mappings help |
### Mappings
```
<Plug>(git-messenger)
```
The same as running `:GitMessenger` command.
By default, this plugin defines following mapping.
```vim
nmap <Leader>gm <Plug>(git-messenger)
```
If you don't like the default mapping, set `g:git_messenger_no_default_mappings` to `v:true` in
your `.vimrc` or `init.vim` and map the `<Plug>` mapping to your favorite key sequence.
For example:
```vim
nmap <C-w>m <Plug>(git-messenger)
```
Some other additional `<Plug>` mappings. Please read [`:help git-messenger`][doc].
### Variables
Some global variables are available to configure the behavior of this plugin.
#### `g:git_messenger_close_on_cursor_moved` (Default: `v:true`)
When this value is set to `v:false`, a popup window is no longer closed automatically when moving a
cursor after the window is shown up.
#### `g:git_messenger_include_diff` (Default: `"none"`)
One of `"none"`, `"current"`, `"all"`.
When this value is not set to `"none"`, a popup window includes diff hunks of the commit at showing
up. `"current"` includes diff hunks of only current file in the commit. `"all"` includes all diff
hunks in the commit.
Please note that typing `d`/`D` or `r`/`R` in popup window toggle showing diff
hunks even if this value is set to `"none"`.
#### `g:git_messenger_git_command` (Default: `"git"`)
`git` command to retrieve commit messages. If your `git` executable is not in `$PATH` directories,
please specify the path to the executable.
#### `g:git_messenger_no_default_mappings` (Default: `v:false`)
When this value is set to `v:true`, it does not define any key mappings. `<Plug>` mappings are still
defined since they don't make any conflicts with existing mappings.
#### `g:git_messenger_into_popup_after_show` (Default: `v:true`)
When this value is set to `v:false`, running `:GitMessenger` or `<plug>(git-messenger)` again after
showing a popup does not move the cursor in the window.
#### `g:git_messenger_always_into_popup` (Default: `v:false`)
When this value is set to `v:true`, the cursor goes into a popup window when running `:GitMessenger`
or `<Plug>(git-messenger)`.
#### `g:git_messenger_extra_blame_args` (Default: `""`)
When this variable is set the contents will be appended to the git blame
command. Use it to add options (like -w).
#### `g:git_messenger_preview_mods` (Default: `""`)
This variable is effective only when opening preview window (on Neovim (0.3.0 or earlier) or Vim).
Command modifiers for opening preview window. The value will be passed as prefix of `:pedit` command.
For example, setting `"botright"` to the variable opens a preview window at bottom of the current
window. Please see `:help <mods>` for more details.
#### `g:git_messenger_max_popup_height` (Default: `v:null`)
Max lines of popup window in an integer value. Setting `v:null` means no limit.
#### `g:git_messenger_max_popup_width` (Default: `v:null`)
Max characters of popup window in an integer value. Setting `v:null` means no limit.
#### `g:git_messenger_date_format` (Default: `"%c"`)
String value to format dates in popup window. Please see `:help strftime()` to know the details of
the format.
```vim
" Example: '2019 May 26 03:27:43'
let g:git_messenger_date_format = "%Y %b %d %X"
```
#### `g:git_messenger_conceal_word_diff_marker` (Default: `v:true`)
When this value is set to `v:true`, markers for word diffs like `[-`, `-]`, `{+`, `+}` are concealed.
Set `v:false` when you don't want to hide them.
Note: Word diff is enabled by typing "r" in a popup window.
#### `g:git_messenger_floating_win_opts` (Default `{}`)
Options passed to `nvim_open_win()` on opening a popup window. This is useful when you want to
override some window options.
The following example will add single border line to the window.
```vim
let g:git_messenger_floating_win_opts = { 'border': 'single' }
```
#### `g:git_messenger_popup_content_margins` (Default: `v:true`)
Setting `v:true` means adding margins in popup window. Blank lines at the top and bottom of popup
content are inserted. And every line is indented with one whitespace character.
Setting `v:false` to this variable removes all the margins.
### Popup Window Highlight
This plugin uses color definitions from your colorscheme for highlighting stuffs in popup window by
default. This is done by linking highlight groups in [syntax/gitmessengerpopup.vim](syntax/gitmessengerpopup.vim)
on `gitmessengerpopup` filetype. Highlights for diff are common with normal `diff` filetype syntax
highlighting.
If the groups don't fit, please rearrange the highlight with `:hi link`. For example:
```vim
" Normal color in popup window with 'CursorLine'
hi link gitmessengerPopupNormal CursorLine
" Header such as 'Commit:', 'Author:' with 'Statement' highlight group
hi link gitmessengerHeader Statement
" Commit hash at 'Commit:' header with 'Special' highlight group
hi link gitmessengerHash Special
" History number at 'History:' header with 'Title' highlight group
hi link gitmessengerHistory Title
```
For another example, if you want to define colors directly, defining the colors with `:hi` works
fine as follows.
```vim
hi gitmessengerPopupNormal term=None guifg=#eeeeee guibg=#333333 ctermfg=255 ctermbg=234
hi gitmessengerHeader term=None guifg=#88b8f6 ctermfg=111
hi gitmessengerHash term=None guifg=#f0eaaa ctermfg=229
hi gitmessengerHistory term=None guifg=#fd8489 ctermfg=210
```
Note: If your colorscheme does not allocate proper color for `NormalFloat`, you may need to set
proper color to `gitmessengerPopupNormal`.
Note: `gitmessengerPopupNormal` is only available on Neovim since `winhighlight` option is used.
On Vim, simply `Normal` highlight group is used for normal color.
### Configuration for Popup Window
Filetype `gitmessengerpopup` is set in the popup window. Please hook `FileType` event to do some
local setup within a popup window.
For example:
```vim
function! s:setup_git_messenger_popup() abort
" Your favorite configuration here
" For example, set go back/forward history to <C-o>/<C-i>
nmap <buffer><C-o> o
nmap <buffer><C-i> O
endfunction
autocmd FileType gitmessengerpopup call <SID>setup_git_messenger_popup()
```
Recent Neovim supports adding border lines to floating windows. `git_messenger_floating_win_opts`
is available to set the options. And `g:git_messenger_popup_content_margins` can remove margins
within popup content if you feel margins are unnecessary.
```vim
let g:git_messenger_floating_win_opts = { 'border': 'single' }
let g:git_messenger_popup_content_margins = v:false
```
<img alt="popup with border" src="https://github.com/rhysd/ss/blob/master/git-messenger.vim/border_popup.png?raw=true" width=684 height=203 />
### Health Check
This plugin supports a health checker on Neovim. When you see some error, please run `:checkhealth`
to check your environment is ready for use of this plugin.
On Vim, please install [vim-healthcheck](https://github.com/rhysd/vim-healthcheck) and run
`:CheckHealth`. It's a plugin to run `:checkhealth` on Vim.
### Known Issues
- On Windows, `git` command installed via MSYS does not work. Please use [Git for Windows][git-win]
for now. This issue is tracked at [#57](https://github.com/rhysd/git-messenger.vim/issues/57).
## License
Distributed under [the MIT License](LICENSE)
[repo]: https://github.com/rhysd/git-messenger.vim
[ci-badge]: https://github.com/rhysd/git-messenger.vim/workflows/CI/badge.svg?branch=master&event=push
[ci]: https://github.com/rhysd/git-messenger.vim/actions?query=workflow%3ACI+branch%3Amaster
[codecov]: https://codecov.io/gh/rhysd/git-messenger.vim
[codecov-badge]: https://codecov.io/gh/rhysd/git-messenger.vim/branch/master/graph/badge.svg
[doc]: ./doc/git-messenger.txt
[nvim-install]: https://github.com/neovim/neovim/wiki/Installing-Neovim
[git-win]: https://gitforwindows.org/