syntax/magit.vim: make title limit configurable

README.md

@@ -309,6 +309,12 @@ Git command, may be simply simply "git" if git is in your path. Defualt is "git"
 To disable chatty inline help in magit buffer (default 1)
 > let g:magit_show_help=[01]
 
+#### g:magit_commit_title_limit
+
+Text is grayed if first line of commit message exceed this number of character (default 50)
+
+> let g:magit_commit_title_limit=[0..300]
+
 #### g:magit_default_show_all_files
 
 When this variable is set to 0, all diff files are hidden by default.

doc/vimagit.txt

@@ -351,6 +351,13 @@ let g:magit_git_cmd="git"
 To disable chatty inline help in magit buffer (default 1)
 let g:magit_show_help=[01]
 
+                                            *vimagit-g:magit_commit_title_limit*
+
+Text is grayed if first line of commit message exceed this number of character
+(default 50)
+
+let g:magit_commit_title_limit=[0..300]
+
                                         *vimagit-g:magit_default_show_all_files*
 When this variable is set to 0, all diff files are hidden by default.
 When this variable is set to 1, all diff for modified files are shown by default.

plugin/magit.vim

@@ -59,6 +59,9 @@ let g:magit_discard_untracked_do_delete = get(g:, 'magit_discard_untracked_do_de
 let g:magit_refresh_gutter         = get(g:, 'magit_refresh_gutter'   ,         1)
 " Should deprecate the following
 let g:magit_refresh_gitgutter      = get(g:, 'magit_refresh_gitgutter',         0)
+
+let g:magit_commit_title_limit     = get(g:, 'magit_commit_title_limit',        50)
+
 let g:magit_warning_max_lines      = get(g:, 'magit_warning_max_lines',         10000)
 
 let g:magit_git_cmd                = get(g:, 'magit_git_cmd'          ,         "git")

syntax/magit.vim

@@ -13,7 +13,7 @@ syn include @diff syntax/diff.vim
 execute 'syn match titleEntry "' . g:magit_section_re . '\n=\+"'
 hi def link titleEntry Comment
 
-execute 'syn match commitMsgExceed "\(=\+\n.\{50}\)\@<=.*$"'
+execute 'syn match commitMsgExceed "\(=\+\n.\{' . g:magit_commit_title_limit . '}\)\@<=.*$"'
 hi def link commitMsgExceed Comment
 
 execute 'syn match stashEntry "' . g:magit_stash_re . '"'