Add support for fossil branches

Refs #21

README.md

@@ -118,7 +118,7 @@ let g:promptline_preset = {
 " available slices:
 "
 " promptline#slices#cwd() - current dir, truncated to 3 dirs. To configure: promptline#slices#cwd({ 'dir_limit': 4 })
-" promptline#slices#vcs_branch() - branch name only. by default only git branch is enabled. Use promptline#slices#vcs_branch({ 'hg': 1, 'svn': 1}) to enable check for svn and mercurial branches. Note that always checking if inside a branch slows down the prompt
+" promptline#slices#vcs_branch() - branch name only. By default, only git branch is enabled. Use promptline#slices#vcs_branch({ 'hg': 1, 'svn': 1, 'fossil': 1}) to enable check for svn, mercurial and fossil branches. Note that always checking if inside a branch slows down the prompt
 " promptline#slices#last_exit_code() - display exit code of last command if not zero
 " promptline#slices#jobs() - display number of shell jobs if more than zero
 " promptline#slices#battery() - display battery percentage (on OSX and linux) only if below 10%. Configure the threshold with promptline#slices#battery({ 'threshold': 25 })

autoload/promptline/slices/vcs_branch.vim

@@ -3,6 +3,7 @@ fun! promptline#slices#vcs_branch#function_body(options)
   let git = get(a:options, 'git', 1)
   let svn = get(a:options, 'svn', 0)
   let hg = get(a:options, 'hg', 0)
+  let fossil = get(a:options, 'fossil', 0)
 
   let lines = [
         \'function __promptline_vcs_branch {',
@@ -62,6 +63,19 @@ fun! promptline#slices#vcs_branch#function_body(options)
         \'']
   endif
 
+  if fossil
+    let lines += [
+        \'',
+        \'  # fossil',
+        \'  if hash fossil 2>/dev/null; then',
+        \'    if branch=$( fossil branch 2>/dev/null ); then',
+        \'      branch=${branch##* }',
+        \'      printf "%s" "${branch_symbol}${branch:-unknown}"',
+        \'      return',
+        \'    fi',
+        \'  fi']
+  endif
+
   let lines += [
         \'  return 1',
         \'}']