Add configuration option to disable key maps.

And add a little documentation.

README.mkd

@@ -93,6 +93,12 @@ nmap <Leader>ha <Plug>GitGutterStageHunk
 nmap <Leader>hu <Plug>GitGutterRevertHunk
 ```
 
+If you don't want vim-gitgutter to set up any mappings at all, use this:
+
+```viml
+let g:gitgutter_map_keys = 0
+```
+
 Finally, you can force vim-gitgutter to update its signs across all visible buffers with `:GitGutterAll`.
 
 See the customisation section below for how to change the defaults.
@@ -121,6 +127,7 @@ You can customise:
 * The signs' colours and symbols
 * Line highlights
 * Extra arguments for `git diff`
+* Key mappings
 * Whether or not to escape `grep` (default to no)
 * Whether or not vim-gitgutter is on initially (defaults to on)
 * Whether or not signs are shown (defaults to yes)
@@ -197,6 +204,17 @@ If you want to pass extra arguments to `git diff`, for example to ignore whitesp
 let g:gitgutter_diff_args = '-w'
 ```
 
+#### Key mappings
+
+To disable all key mappings:
+
+```viml
+let g:gitgutter_map_keys = 0`
+```
+
+See above for configuring maps for hunk-jumping and staging/reverting.
+
+
 #### Whether or not to escape `grep`
 
 If you have `grep` aliased to something which changes its output, for example `grep --color=auto -H`, you will need to tell vim-gitgutter to use raw grep:

doc/gitgutter.txt

@@ -103,6 +103,7 @@ You can customise:
 - The signs' colours and symbols
 - Line highlights
 - Extra arguments for git-diff
+- Key mappings
 - Whether or not to escape grep (defaults to no)
 - Whether or not vim-gitgutter is on initially (defaults to on)
 - Whether or not signs are shown (defaults to yes)
@@ -189,6 +190,25 @@ To pass extra arguments to git-diff, add this to your |vimrc|:
   let g:gitgutter_diff_args = '-w'
 <
 
+KEY MAPPINGS
+
+To disable all key maps:
+>
+  let g:gitgutter_map_keys = 0
+<
+
+To change the hunk-jumping maps:
+>
+  nmap [h <Plug>GitGutterPrevHunk
+  nmap ]h <Plug>GitGutterNextHunk
+<
+
+To change the hunk-staging/reverting maps:
+>
+  nmap <Leader>hs <Plug>GitGutterStageHunk
+  nmap <Leader>hr <Plug>GitGutterRevertHunk
+<
+
 TO ESCAPE GREP
 
 To avoid any alias you have for grep, use this:

plugin/gitgutter.vim

@@ -27,6 +27,7 @@ call s:set('g:gitgutter_sign_removed',          '_')
 call s:set('g:gitgutter_sign_modified_removed', '~_')
 call s:set('g:gitgutter_diff_args',             '')
 call s:set('g:gitgutter_escape_grep',           0)
+call s:set('g:gitgutter_map_keys',              1)
 
 call highlight#define_sign_column_highlight()
 call highlight#define_highlights()
@@ -248,20 +249,24 @@ endfunction
 nnoremap <silent> <Plug>GitGutterNextHunk :<C-U>execute v:count1 . "GitGutterNextHunk"<CR>
 nnoremap <silent> <Plug>GitGutterPrevHunk :<C-U>execute v:count1 . "GitGutterPrevHunk"<CR>
 
-if !hasmapto('<Plug>GitGutterNextHunk') && maparg(']h', 'n') ==# ''
+if g:gitgutter_map_keys
+  if !hasmapto('<Plug>GitGutterNextHunk') && maparg(']h', 'n') ==# ''
     nmap ]h <Plug>GitGutterNextHunk
     nmap [h <Plug>GitGutterPrevHunk
+  endif
 endif
 
 
 nnoremap <silent> <Plug>GitGutterStageHunk :GitGutterStageHunk<CR>
 nnoremap <silent> <Plug>GitGutterRevertHunk :GitGutterRevertHunk<CR>
 
-if !hasmapto('<Plug>GitGutterStageHunk') && maparg('<Leader>ha', 'n') ==# ''
+if g:gitgutter_map_keys
+  if !hasmapto('<Plug>GitGutterStageHunk') && maparg('<Leader>ha', 'n') ==# ''
     nmap <Leader>ha <Plug>GitGutterStageHunk
-endif
-if !hasmapto('<Plug>GitGutterRevertHunk') && maparg('<Leader>hr', 'n') ==# ''
+  endif
+  if !hasmapto('<Plug>GitGutterRevertHunk') && maparg('<Leader>hr', 'n') ==# ''
     nmap <Leader>hr <Plug>GitGutterRevertHunk
+  endif
 endif