Add initial implement

Author: lambdalisue

LICENSE

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+Copyright 2020 Alisue, hashnote.net
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

README.md

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+# fern-mapping-git.vim
+
+[![fern plugin](https://img.shields.io/badge/🌿%20fern-plugin-yellowgreen)](https://github.com/lambdalisue/fern.vim)
+
+[fern.vim](https://github.com/lambdalisue/fern.vim) plugin which add Git related mappings on `file://` scheme.
+
+**UNDER DEVELOPMENT**
+
+## Usage
+
+This plugin automatically add the following actions to `file` scheme.
+
+| Mapping | Action        | Description                         |
+| ------- | ------------- | ----------------------------------- |
+| `<<`    | `git-stage`   | Stage the selected/cursor node(s)   |
+| `>>`    | `git-unstage` | Unstage the selected/cursor node(s) |
+
+## See also
+
+- [fern-git-status](https://github.com/lambdalisue/fern-git-status) - Add Git status badge

autoload/fern/scheme/file/mapping/git.vim

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+let s:Process = vital#fern#import('Async.Promise.Process')
+
+function! fern#scheme#file#mapping#git#init(disable_default_mappings) abort
+  nnoremap <buffer><silent> <Plug>(fern-action-git-stage) :<C-u>call <SID>call('stage')<CR>
+  nnoremap <buffer><silent> <Plug>(fern-action-git-unstage) :<C-u>call <SID>call('unstage')<CR>
+
+  if !a:disable_default_mappings
+        \ && !g:fern#scheme#file#mapping#git#disable_default_mappings
+    nmap <buffer><nowait> << <Plug>(fern-action-git-stage)
+    nmap <buffer><nowait> >> <Plug>(fern-action-git-unstage)
+  endif
+endfunction
+
+function! s:call(name, ...) abort
+  return call(
+        \ 'fern#mapping#call',
+        \ [funcref(printf('s:map_%s', a:name))] + a:000,
+        \)
+endfunction
+
+function! s:map_stage(helper) abort
+  if a:helper.sync.get_scheme() !=# 'file'
+    throw printf("git-stage action requires 'file' scheme")
+  endif
+  let root = a:helper.sync.get_root_node()
+  let nodes = a:helper.sync.get_selected_nodes()
+  let nodes = empty(nodes) ? [a:helper.sync.get_cursor_node()] : nodes
+  let paths = map(copy(nodes), { -> v:val._path })
+
+  call s:Process.start(['git', '-C', root._path, 'add', '--ignore-errors', '--'] + paths)
+        \.then({ -> a:helper.async.update_marks([]) })
+        \.then({ -> a:helper.async.redraw() })
+endfunction
+
+function! s:map_unstage(helper) abort
+  if a:helper.sync.get_scheme() !=# 'file'
+    throw printf("git-unstage action requires 'file' scheme")
+  endif
+  let root = a:helper.sync.get_root_node()
+  let nodes = a:helper.sync.get_selected_nodes()
+  let nodes = empty(nodes) ? [a:helper.sync.get_cursor_node()] : nodes
+  let paths = map(copy(nodes), { -> v:val._path })
+
+  call s:Process.start(['git', '-C', root._path, 'reset', '--quiet', '--'] + paths)
+        \.then({ -> a:helper.async.update_marks([]) })
+        \.then({ -> a:helper.async.redraw() })
+endfunction
+
+
+let g:fern#scheme#file#mapping#git#disable_default_mappings = get(g:, 'fern#scheme#file#mapping#git#disable_default_mappings', 0)

plugin/fern_mapping_git.vim

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+if exists('g:fern_mapping_project_top_loaded')
+  finish
+endif
+let g:fern_mapping_project_top_loaded = 1
+
+call add(g:fern#scheme#file#mapping#mappings, 'git')