Added agnoster-mercurial theme with support for mercurial

themes/agnoster-mercurial/README.md

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+## agnoster
+
+A ZSH theme optimized for people who use:
+
+* Solarized
+* Git
+* Unicode-compatible fonts and terminals (I use iTerm2 + Menlo)
+
+For Mac users, I highly recommend iTerm 2 + Solarized Dark
+
+![agnoster theme](https://f.cloud.github.com/assets/1765209/255379/452c668e-8c0b-11e2-8a8e-d1d13e57d15f.png)
+
+
+#### Characteristics
+
+* If the previous command failed (✘)
+* User @ Hostname (if user is not DEFAULT_USER, which can then be set in your profile)
+* Git status
+* Branch (⭠) or detached head (➦)
+* Current branch / SHA1 in detached head state
+* Dirty working directory (±, color change)
+* Working directory
+* Elevated (root) privileges (⚡)
+
+
+Ported from https://gist.github.com/agnoster/3712874.

themes/agnoster-mercurial/fish_prompt.fish

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+# name: Agnoster
+# agnoster's Theme - https://gist.github.com/3712874
+# A Powerline-inspired theme for FISH
+#
+# # README
+#
+# In order for this theme to render correctly, you will need a
+# [Powerline-patched font](https://gist.github.com/1595572).
+
+## Set this options in your config.fish (if you want to :])
+# set -g theme_display_user yes
+# set -g default_user your_normal_user
+
+
+
+set -g current_bg NONE
+set segment_separator \uE0B0
+set right_segment_separator \uE0B0
+# ===========================
+# Helper methods
+# ===========================
+
+set -g __fish_git_prompt_showdirtystate 'yes'
+set -g __fish_git_prompt_char_dirtystate '±'
+set -g __fish_git_prompt_char_cleanstate ''
+
+function parse_git_dirty
+  set -l submodule_syntax
+  set submodule_syntax "--ignore-submodules=dirty"
+  set git_dirty (command git status -s $submodule_syntax  2> /dev/null)
+  if [ -n "$git_dirty" ]
+    if [ $__fish_git_prompt_showdirtystate = "yes" ]
+      echo -n "$__fish_git_prompt_char_dirtystate"
+    end
+  else
+    if [ $__fish_git_prompt_showdirtystate = "yes" ]
+      echo -n "$__fish_git_prompt_char_cleanstate"
+    end
+  end
+end
+
+
+# ===========================
+# Segments functions
+# ===========================
+
+function prompt_segment -d "Function to draw a segment"
+  set -l bg
+  set -l fg
+  if [ -n "$argv[1]" ]
+    set bg $argv[1]
+  else
+    set bg normal
+  end
+  if [ -n "$argv[2]" ]
+    set fg $argv[2]
+  else
+    set fg normal
+  end
+  if [ "$current_bg" != 'NONE' -a "$argv[1]" != "$current_bg" ]
+    set_color -b $bg
+    set_color $current_bg
+    echo -n "$segment_separator "
+    set_color -b $bg
+    set_color $fg
+  else
+    set_color -b $bg
+    set_color $fg
+    echo -n " "
+  end
+  set current_bg $argv[1]
+  if [ -n "$argv[3]" ]
+    echo -n -s $argv[3] " "
+  end
+end
+
+function prompt_finish -d "Close open segments"
+  if [ -n $current_bg ]
+    set_color -b normal
+    set_color $current_bg
+    echo -n "$segment_separator "
+  end
+  set -g current_bg NONE
+end
+
+
+# ===========================
+# Theme components
+# ===========================
+
+function prompt_user -d "Display actual user if different from $default_user"
+  if [ "$theme_display_user" = "yes" ]
+    if [ "$USER" != "$default_user" -o -n "$SSH_CLIENT" ]
+      set USER_PROMPT (whoami)@(hostname)
+      prompt_segment black yellow $USER_PROMPT
+    end
+  end
+end
+
+function prompt_dir -d "Display the actual directory"
+  prompt_segment blue black (prompt_pwd)
+end
+
+function prompt_hg -d "Display mercurial state"
+  set -l branch
+  set -l state
+  if command hg id >/dev/null 2>&1
+    if command hg prompt >/dev/null 2>&1
+      set branch (command hg prompt "{branch}")
+      set state (command hg prompt "{status}")
+      set branch_symbol \uE0A0
+      if [ "$state" = "!" ]
+        prompt_segment red white "$branch_symbol $branch ±"
+      else if [ "$state" = "?" ]
+          prompt_segment yellow black "$branch_symbol $branch ±"
+        else
+          prompt_segment green black "$branch_symbol $branch"
+      end
+    end
+  end
+end
+
+
+function prompt_git -d "Display the actual git state"
+  set -l ref
+  set -l dirty
+  if command git rev-parse --is-inside-work-tree >/dev/null 2>&1
+    set dirty (parse_git_dirty)
+    set ref (command git symbolic-ref HEAD 2> /dev/null)
+    set ref (command git symbolic-ref HEAD 2> /dev/null)
+    if [ $status -gt 0 ]
+      set -l branch (command git show-ref --head -s --abbrev |head -n1 2> /dev/null)
+      set ref "➦ $branch "
+    end
+    set branch_symbol \uE0A0
+    set -l branch (echo $ref | sed  "s-refs/heads/-$branch_symbol -")
+    if [ "$dirty" != "" ]
+      prompt_segment yellow black "$branch $dirty"
+    else
+      prompt_segment green black "$branch $dirty"
+    end
+  end
+end
+
+function prompt_status -d "the symbols for a non zero exit status, root and background jobs"
+    if [ $RETVAL -ne 0 ]
+      prompt_segment black red "✘"
+    end
+
+    # if superuser (uid == 0)
+    set -l uid (id -u $USER)
+    if [ $uid -eq 0 ]
+      prompt_segment black yellow "⚡"
+    end
+
+    # Jobs display
+    if [ (jobs -l | wc -l) -gt 0 ]
+      prompt_segment black cyan "⚙"
+    end
+end
+
+# ===========================
+# Apply theme
+# ===========================
+
+function fish_prompt
+  set -g RETVAL $status
+  prompt_status
+  prompt_user
+  prompt_dir
+  prompt_hg
+  prompt_git
+  prompt_finish
+end