syl20bnr theme improvements

themes/syl20bnr/README.md

 # syl20bnr theme
 
-Sylvain Benner personal, compact (hmmm...) yet complete (almost :-)) oh-my-fish theme.
+A semi-compact oh-my-fish theme with [nice support for git](#git).
+
+The theme has been tested on `Ubuntu 14.04 (Trusty)` and `Mac OS X 10.10 (Yosemite)`.
+It is also compatible with [Cygwin with the appropriate packages](#cygwin-compatibility).
 
 **Table of Contents**  *generated with [DocToc](http://doctoc.herokuapp.com/)*
 
@@ -47,28 +50,44 @@ replaced by the `git` segment (I should know where I am).
 The `git` segment format is `X:YI@Z:P(N)` where:
 - `X` is `git`
 - `Y` is the current branch name
-- `I` is the information about the current repository state
+- `I` is some information about the current repository state
 - `Z` is the name of the repository
 - `P` is the current working path basename (name of the current directory)
 If `P` = `Z` then `P(N)` is not displayed
 - `N` is the depth of the path starting from base directory of the repository
 
 The displayed information `I` is:
-- Dirtiness is indicated by a little dot after the branch name.
-- Unpushed commits are indicated with up arrows
-- The number of unpushed commits is indicated right after the up arrows
+- Unpushed commits are indicated with an up arrow like this `[↑1]`
+- Unmerged fetched commits are indicated with a down arrow like this `[↓1]`
+
+**Note:** The dirtiness of the current branch is indicated by its color:
+- red: it is dirty
+- green: it is up to date
 
+**Note:** The unmerged commits count appears only if the changes in the
+upstream branch as been fetched.
 
 #### Examples
 
-Dirty:
-![dirty](http://raw2.github.com/syl20bnr/oh-my-fish-theme-syl20bnr/master/screenshots/prompt_fish-syl20bnr-git-dirty.png)
+Dirty (changes not committed):
+
+![dirty](http://raw2.github.com/syl20bnr/oh-my-fish-theme-syl20bnr/master/screenshots/prompt_fish-syl20bnr-git-dirty2.png)
 
 Unpushed commits:
-![unpushed_commits](http://raw2.github.com/syl20bnr/oh-my-fish-theme-syl20bnr/master/screenshots/prompt_fish-syl20bnr-git-ucommit-count.png)
+
+![unpushed_commits](http://raw2.github.com/syl20bnr/oh-my-fish-theme-syl20bnr/master/screenshots/prompt_fish-syl20bnr-git-unpushed.png)
+
+Unmerged commits:
+
+![unmerged_commits](http://raw2.github.com/syl20bnr/oh-my-fish-theme-syl20bnr/master/screenshots/prompt_fish-syl20bnr-git-unmerged.png)
+
+Both unpushed and unmerged commits:
+
+![unmerged_commits](http://raw2.github.com/syl20bnr/oh-my-fish-theme-syl20bnr/master/screenshots/prompt_fish-syl20bnr-git-unpushed_unmerged.png)
 
 In a sub-directory of the repository:
-![repo_subdir](http://raw2.github.com/syl20bnr/oh-my-fish-theme-syl20bnr/master/screenshots/prompt_fish-syl20bnr-git-subdir.png)
+
+![repo_subdir](http://raw2.github.com/syl20bnr/oh-my-fish-theme-syl20bnr/master/screenshots/prompt_fish-syl20bnr-git-subdir2.png)
 
 ### vi-mode
 

themes/syl20bnr/fish_prompt.fish

@@ -28,31 +28,16 @@ function __syl20bnr_git_repo_base -d "Return the current repository name"
   echo (command git rev-parse --show-toplevel ^/dev/null)
 end
 
-function __syl20bnr_is_git_dirty -d "Check if there is uncommited changes"
-  echo (command git status -s --ignore-submodules=dirty ^/dev/null)
-end
-
-function __syl20bnr_is_git_ahead -d "Check if there is unpushed commits"
-  echo (command git status -s -b ^/dev/null | grep ahead)
+function __syl20bnr_git_status -d "git status command"
+  git status -b -s --ignore-submodules=dirty
 end
 
 function __syl20bnr_unpushed_commit_count -d "Return the number of unpushed commits"
-  git status -s -b ^/dev/null | grep -E -o "ahead\ [0-9]+" | awk '{print $2}'
+  echo $argv[1] | grep -E -o "ahead\ [0-9]+" | awk '{print $2}'
 end
 
-function fish_vi_prompt_cm --description "Displays the current mode"
-  switch $fish_bind_mode
-    case default
-      set_color --bold --background red white
-      echo "[N]"
-    case insert
-      set_color --bold --background green white
-      echo "[I]"
-    case visual
-      set_color --bold --background magenta white
-      echo "[V]"
-  end
-  set_color normal
+function __syl20bnr_unmerged_commit_count -d "Return the number of unmerged commits"
+  echo $argv[1] | grep -E -o "behind\ [0-9]+" | awk '{print $2}'
 end
 
 # ----------------------------------------------------------------------------
@@ -94,27 +79,34 @@ function fish_prompt -d "Write out the left prompt of the syl20bnr theme"
   #   P is the current working path basename (name of the current directory)
   #   C is the depth of the path starting from base directory of the repo
   # The displayed information is:
-  #   Dirtiness is indicated by a little dot after the branch name.
   #   Unpushed commits are indicated with up arrows
   #   The number of unpushed commits is indicated right after the up arrows
+  # Note: 
+  #   Dirtiness is indicated by the color of the branch name, red is dirty,
+  #   green is up-to-date.
   # If P = Z then P(C) is not displayed
   set -l ps_git ""
   set -l git_branch_name (__syl20bnr_git_branch_name)
   if test -n "$git_branch_name"
     set -l git_repo_name (__syl20bnr_git_repo_name)
     set -l git_info ""
-    if test -n (__syl20bnr_is_git_ahead)
-      set git_info $colbgreen"↑↑↑"$colnormal"("(__syl20bnr_unpushed_commit_count)")"
+    set -l git_status (__syl20bnr_git_status)
+    if echo $git_status | grep ahead > /dev/null
+      set git_info "["$colbgreen"↑"(__syl20bnr_unpushed_commit_count $git_status)$colnormal"]"
     end
-    if test -n (__syl20bnr_is_git_dirty)
-      set git_info $git_info$colbred"·"
+    if echo $git_status | grep behind > /dev/null
+      set git_info "$git_info""["$colbred"↓"(__syl20bnr_unmerged_commit_count $git_status)$colnormal"]"
     end
-    set ps_git $colbwhite"git:"$colbcyan$git_branch_name$git_info$colnormal"@"$colbred$git_repo_name
+    set -l colbranch $colbgreen
+    if echo $git_status | grep -E "\s\?\?\s|\sM\s|\sD\s" > /dev/null
+      set colbranch $colbred
+    end
+    set ps_git $colbwhite"git:"$colbcyan$git_branch_name$git_info$colnormal"@"$colbranch$git_repo_name
     if test "$basedir_name" != "$git_repo_name"
         set -l basedir_depth (echo (__syl20bnr_git_repo_base) | sed "s/\// /g" | wc -w)
         set -l depth (echo (pwd) | sed "s/\// /g" | wc -w)
         set depth (math $depth - $basedir_depth)
-        set ps_git $ps_git$colbwhite":"$colbgreen$basedir_name$colnormal"("$depth")"
+        set ps_git $ps_git$colnormal":"$colbwhite$basedir_name$colnormal"("$depth")"
     end
   end
 
@@ -151,7 +143,14 @@ function fish_prompt -d "Write out the left prompt of the syl20bnr theme"
     set ps_vi $colnormal"["$vi_mode$colnormal"]"
   end
   if test "$fish_key_bindings" = "fish_vi_key_bindings" -o "$fish_key_bindings" = "my_fish_key_bindings" 
-    set ps_vi (fish_vi_prompt_cm)
+    switch $fish_bind_mode
+      case default
+        set ps_vi $colnormal"("$colred"N"$colnormal")"
+      case insert
+        set ps_vi $colnormal"("$colgreen"I"$colnormal")"
+      case visual
+        set ps_vi $colnormal"("$colwhite"V"$colnormal")"
+    end
   end
 
   # end of prompt