add support for fossil

README.md

@@ -10,7 +10,7 @@ It's __fast__, __highly configurable__ and __well documented__.
 
 Features:
 
-- supports git, mercurial, darcs, bazaar, subversion, cvs, rcs
+- supports git, mercurial, darcs, bazaar, subversion, cvs, rcs, fossil
 - quick jumping between changed lines
 - apart from signs there is also optional line highlighting
 - fully configurable through global variables (options and mappings)
@@ -97,6 +97,7 @@ Current the following VCS are supported:
 - subversion (svn)
 - cvs
 - rcs
+- fossil
 
 #### quick jumping between changed lines
 

doc/signify.txt

@@ -53,6 +53,7 @@ version control system:
     - subversion
     - cvs
     - rcs
+    - fossil
 
 The plugin defines 4 new kinds of signs and their corresponding highlighting
 groups. It tries to inherent existing colors from the SignColumn group, if
@@ -96,7 +97,7 @@ not defaults.
 
     let g:signify_vcs_list = [ 'git', 'hg' ]
 
-Default: ['git', 'hg', 'svn', 'darcs', 'bzr', 'cvs', 'rcs']
+Default: ['git', 'hg', 'svn', 'darcs', 'bzr', 'fossil', 'cvs', 'rcs']
 
 This variable determines the VCS to check for and in what order. If you only
 use git and mercurial, you can shorten the list to the shown example. If you

plugin/signify.vim

@@ -14,7 +14,7 @@ let s:other_signs_line_numbers = {}
 
 " overwrite non-signify signs by default
 let s:sign_overwrite = get(g:, 'signify_sign_overwrite', 1)
-let s:vcs_list       = get(g:, 'signify_vcs_list', [ 'git', 'hg', 'svn', 'darcs', 'bzr', 'cvs', 'rcs' ])
+let s:vcs_list       = get(g:, 'signify_vcs_list', [ 'git', 'hg', 'svn', 'darcs', 'bzr', 'fossil', 'cvs', 'rcs' ])
 
 let s:id_start = 0x100
 let s:id_top   = s:id_start
@@ -292,6 +292,14 @@ function! s:repo_get_diff_darcs(path) abort
   endif
 endfunction
 
+" Function: s:repo_get_diff_fossil {{{1
+function! s:repo_get_diff_fossil(path) abort
+  if executable('fossil')
+    let diff = system('cd '. s:escape(fnamemodify(a:path, ':h')) .' && fossil set diff-command "'. s:difftool .' -U 0" && fossil diff --unified -c 0 -- '. s:escape(a:path))
+    return v:shell_error ? '' : diff
+  endif
+endfunction
+
 " Function: s:repo_get_diff_cvs {{{1
 function! s:repo_get_diff_cvs(path) abort
   if executable('cvs')