Improve the git prompt

- Fix branch for older git version (--short for symbolic-ref was not
  available on git 1.7.9.5)
- Use index (git status) for checking if staged
- Add status indication for copied
- Remove variables for statuses (less litter in the variables)
- Remove usage of eval to echo and set_color
- Replace printf where possible with echo -n

share/functions/__terlar_git_prompt.fish

@@ -1,75 +1,79 @@
 set -gx fish_color_git_clean green
-set -gx fish_color_git_dirty red
-set -gx fish_color_git_ahead red
 set -gx fish_color_git_staged yellow
+set -gx fish_color_git_dirty red
 
 set -gx fish_color_git_added green
 set -gx fish_color_git_modified blue
 set -gx fish_color_git_renamed magenta
+set -gx fish_color_git_copied magenta
 set -gx fish_color_git_deleted red
-set -gx fish_color_git_unmerged yellow
-set -gx fish_color_git_untracked cyan
-
-set -gx fish_prompt_git_status_added '✚'
-set -gx fish_prompt_git_status_modified '*'
-set -gx fish_prompt_git_status_renamed '➜'
-set -gx fish_prompt_git_status_deleted '✖'
-set -gx fish_prompt_git_status_unmerged '═'
-set -gx fish_prompt_git_status_untracked '.'
+set -gx fish_color_git_untracked yellow
+set -gx fish_color_git_unmerged red
 
 function __terlar_git_prompt --description 'Write out the git prompt'
-  set -l branch (git symbolic-ref --quiet --short HEAD 2>/dev/null)
+  set -l branch (git rev-parse --abbrev-ref HEAD ^/dev/null)
   if test -z $branch
     return
   end
 
   echo -n '|'
 
-  set -l index (git status --porcelain 2>/dev/null)
+  set -l index (git status --porcelain ^/dev/null|cut -c 1-2|uniq)
+
   if test -z "$index"
     set_color $fish_color_git_clean
-    printf $branch'✓'
+    echo -n $branch'✓'
     set_color normal
     return
   end
 
-  git diff-index --quiet --cached HEAD 2>/dev/null
-  set -l staged $status
-  if test $staged = 1
+  if printf '%s\n' $index|grep '^[ADRCM]' >/dev/null
     set_color $fish_color_git_staged
   else
     set_color $fish_color_git_dirty
   end
 
-  printf $branch'⚡'
+  echo -n $branch'⚡'
 
-  set -l info
   for i in $index
     switch $i
-      case 'A  *'
-        set i added
-      case 'M  *' ' M *'
-        set i modified
-      case 'R  *'
-        set i renamed
-      case 'D  *' ' D *'
-        set i deleted
-      case 'U  *'
-        set i unmerged
-      case '?? *'
-        set i untracked
-    end
-
-    if not contains $i $info
-      set info $info $i
+      case 'A '               ; set added
+      case 'M ' ' M'          ; set modified
+      case 'R '               ; set renamed
+      case 'C '               ; set copied
+      case 'D ' ' D'          ; set deleted
+      case '??'               ; set untracked
+      case 'U*' '*U' 'DD' 'AA'; set unmerged
     end
   end
 
-  for i in added modified renamed deleted unmerged untracked
-    if contains $i $info
-      eval 'set_color $fish_color_git_'$i
-      eval 'printf $fish_prompt_git_status_'$i
-    end
+  if set -q added
+    set_color $fish_color_git_added
+    echo -n '✚'
+  end
+  if set -q modified
+    set_color $fish_color_git_modified
+    echo -n '*'
+  end
+  if set -q renamed
+    set_color $fish_color_git_renamed
+    echo -n '➜'
+  end
+  if set -q copied
+    set_color $fish_color_git_copied
+    echo -n '⇒'
+  end
+  if set -q deleted
+    set_color $fish_color_git_deleted
+    echo -n '✖'
+  end
+  if set -q untracked
+    set_color $fish_color_git_untracked
+    echo -n '?'
+  end
+  if set -q unmerged
+    set_color $fish_color_git_unmerged
+    echo -n '!'
   end
 
   set_color normal