Move current_branch() from git plugin to core lib/git.zsh

Fixes #4085: core -> plugin dependency issue.
Rename it to git_current_branch for clarity that it's git-specific.
Update all plugins that were calling it to use new name.
Fix variable leaks by making more variables in lib/git.zsh local.
Have lib/git.zsh use [[ ]] instead of [ ] everywhere.

lib/git.zsh

-# get the name of the branch we are on
+# Outputs current branch info in prompt format
 function git_prompt_info() {
+  local ref
   if [[ "$(command git config --get oh-my-zsh.hide-status 2>/dev/null)" != "1" ]]; then
     ref=$(command git symbolic-ref HEAD 2> /dev/null) || \
     ref=$(command git rev-parse --short HEAD 2> /dev/null) || return 0
@@ -7,9 +8,8 @@ function git_prompt_info() {
   fi
 }
 
-
 # Checks if working tree is dirty
-parse_git_dirty() {
+function parse_git_dirty() {
   local STATUS=''
   local FLAGS
   FLAGS=('--porcelain')
@@ -29,32 +29,26 @@ parse_git_dirty() {
   fi
 }
 
-# get the difference between the local and remote branches
-git_remote_status() {
+# Gets the difference between the local and remote branches
+function git_remote_status() {
+    local remote ahead behind git_remote_status git_remote_status_detailed
     remote=${$(command git rev-parse --verify ${hook_com[branch]}@{upstream} --symbolic-full-name 2>/dev/null)/refs\/remotes\/}
-    if [[ -n ${remote} ]] ; then
+    if [[ -n ${remote} ]]; then
         ahead=$(command git rev-list ${hook_com[branch]}@{upstream}..HEAD 2>/dev/null | wc -l)
         behind=$(command git rev-list HEAD..${hook_com[branch]}@{upstream} 2>/dev/null | wc -l)
 
-        if [ $ahead -eq 0 ] && [ $behind -eq 0 ]
-        then
-          	git_remote_status="$ZSH_THEME_GIT_PROMPT_EQUAL_REMOTE"
-        elif [ $ahead -gt 0 ] && [ $behind -eq 0 ]
-        then
+        if [[ $ahead -gt 0 ]] && [[ $behind -eq 0 ]]; then
             git_remote_status="$ZSH_THEME_GIT_PROMPT_AHEAD_REMOTE"
             git_remote_status_detailed="$ZSH_THEME_GIT_PROMPT_AHEAD_REMOTE_COLOR$ZSH_THEME_GIT_PROMPT_AHEAD_REMOTE$((ahead))%{$reset_color%}"
-        elif [ $behind -gt 0 ] && [ $ahead -eq 0 ] 
-        then
+        elif [[ $behind -gt 0 ]] && [[ $ahead -eq 0 ]]; then
             git_remote_status="$ZSH_THEME_GIT_PROMPT_BEHIND_REMOTE"
             git_remote_status_detailed="$ZSH_THEME_GIT_PROMPT_BEHIND_REMOTE_COLOR$ZSH_THEME_GIT_PROMPT_BEHIND_REMOTE$((behind))%{$reset_color%}"
-        elif [ $ahead -gt 0 ] && [ $behind -gt 0 ]
-        then
+        elif [[ $ahead -gt 0 ]] && [[ $behind -gt 0 ]]; then
             git_remote_status="$ZSH_THEME_GIT_PROMPT_DIVERGED_REMOTE"
             git_remote_status_detailed="$ZSH_THEME_GIT_PROMPT_AHEAD_REMOTE_COLOR$ZSH_THEME_GIT_PROMPT_AHEAD_REMOTE$((ahead))%{$reset_color%}$ZSH_THEME_GIT_PROMPT_BEHIND_REMOTE_COLOR$ZSH_THEME_GIT_PROMPT_BEHIND_REMOTE$((behind))%{$reset_color%}"
         fi
 
-        if [ $ZSH_THEME_GIT_PROMPT_REMOTE_STATUS_DETAILED ]
-        then
+        if [[ -n $ZSH_THEME_GIT_PROMPT_REMOTE_STATUS_DETAILED ]]; then
             git_remote_status="$ZSH_THEME_GIT_PROMPT_REMOTE_STATUS_PREFIX$remote$git_remote_status_detailed$ZSH_THEME_GIT_PROMPT_REMOTE_STATUS_SUFFIX"
         fi
 
@@ -62,31 +56,47 @@ git_remote_status() {
     fi
 }
 
+# Outputs the name of the current branch
+# Usage example: git pull origin $(git_current_branch)
+# Using '--quiet' with 'symbolic-ref' will not cause a fatal error (128) if
+# it's not a symbolic ref, but in a Git repo.
+function git_current_branch() {
+  local ref
+  ref=$(command git symbolic-ref --quiet HEAD 2> /dev/null)
+  local ret=$?
+  if [[ $ret != 0 ]]; then
+    [[ $ret == 128 ]] && return  # no git repo.
+    ref=$(command git rev-parse --short HEAD 2> /dev/null) || return
+  fi
+  echo ${ref#refs/heads/}
+}
+
+
 # Gets the number of commits ahead from remote
 function git_commits_ahead() {
   if $(echo "$(command git log @{upstream}..HEAD 2> /dev/null)" | grep '^commit' &> /dev/null); then
-    COMMITS=$(command git log @{upstream}..HEAD | grep '^commit' | wc -l | tr -d ' ')
+    local COMMITS=$(command git log @{upstream}..HEAD | grep '^commit' | wc -l | tr -d ' ')
     echo "$ZSH_THEME_GIT_COMMITS_AHEAD_PREFIX$COMMITS$ZSH_THEME_GIT_COMMITS_AHEAD_SUFFIX"
   fi
 }
 
 # Outputs if current branch is ahead of remote
 function git_prompt_ahead() {
-  if [[ -n "$(command git rev-list origin/$(current_branch)..HEAD 2> /dev/null)" ]]; then
+  if [[ -n "$(command git rev-list origin/$(git_current_branch)..HEAD 2> /dev/null)" ]]; then
     echo "$ZSH_THEME_GIT_PROMPT_AHEAD"
   fi
 }
 
 # Outputs if current branch is behind remote
 function git_prompt_behind() {
-  if [[ -n "$(command git rev-list HEAD..origin/$(current_branch) 2> /dev/null)" ]]; then
+  if [[ -n "$(command git rev-list HEAD..origin/$(git_current_branch) 2> /dev/null)" ]]; then
     echo "$ZSH_THEME_GIT_PROMPT_BEHIND"
   fi
 }
 
 # Outputs if current branch exists on remote or not
 function git_prompt_remote() {
-  if [[ -n "$(command git show-ref origin/$(current_branch) 2> /dev/null)" ]]; then
+  if [[ -n "$(command git show-ref origin/$(git_current_branch) 2> /dev/null)" ]]; then
     echo "$ZSH_THEME_GIT_PROMPT_REMOTE_EXISTS"
   else
     echo "$ZSH_THEME_GIT_PROMPT_REMOTE_MISSING"
@@ -95,16 +105,17 @@ function git_prompt_remote() {
 
 # Formats prompt string for current git commit short SHA
 function git_prompt_short_sha() {
-  SHA=$(command git rev-parse --short HEAD 2> /dev/null) && echo "$ZSH_THEME_GIT_PROMPT_SHA_BEFORE$SHA$ZSH_THEME_GIT_PROMPT_SHA_AFTER"
+  local SHA=$(command git rev-parse --short HEAD 2> /dev/null) && echo "$ZSH_THEME_GIT_PROMPT_SHA_BEFORE$SHA$ZSH_THEME_GIT_PROMPT_SHA_AFTER"
 }
 
 # Formats prompt string for current git commit long SHA
 function git_prompt_long_sha() {
-  SHA=$(command git rev-parse HEAD 2> /dev/null) && echo "$ZSH_THEME_GIT_PROMPT_SHA_BEFORE$SHA$ZSH_THEME_GIT_PROMPT_SHA_AFTER"
+  local SHA=$(command git rev-parse HEAD 2> /dev/null) && echo "$ZSH_THEME_GIT_PROMPT_SHA_BEFORE$SHA$ZSH_THEME_GIT_PROMPT_SHA_AFTER"
 }
 
 # Get the status of the working tree
-git_prompt_status() {
+function git_prompt_status() {
+  local INDEX STATUS
   INDEX=$(command git status --porcelain -b 2> /dev/null)
   STATUS=""
   if $(echo "$INDEX" | command grep -E '^\?\? ' &> /dev/null); then
@@ -150,9 +161,9 @@ git_prompt_status() {
   echo $STATUS
 }
 
-#compare the provided version of git to the version installed and on path
-#prints 1 if input version <= installed version
-#prints -1 otherwise
+# Compares the provided version of git to the version installed and on path
+# Outputs -1, 0, or 1 if the installed version is less than, equal to, or
+# greater than the input version, respectively.
 function git_compare_version() {
   local INPUT_GIT_VERSION=$1;
   local INSTALLED_GIT_VERSION
@@ -173,7 +184,7 @@ function git_compare_version() {
   echo 0
 }
 
-#this is unlikely to change so make it all statically assigned
+# This is unlikely to change so make it all statically assigned
 POST_1_7_2_GIT=$(git_compare_version "1.7.2")
-#clean up the namespace slightly by removing the checker function
+# Clean up the namespace slightly by removing the checker function
 unset -f git_compare_version

plugins/git/git.plugin.zsh

@@ -6,19 +6,12 @@ zstyle -s ":vcs_info:git:*:-all-" "command" _omz_git_git_cmd
 # Functions
 #
 
-# The current branch name
-# Usage example: git pull origin $(current_branch)
-# Using '--quiet' with 'symbolic-ref' will not cause a fatal error (128) if
-# it's not a symbolic ref, but in a Git repo.
+# The name of the current branch
+# Back-compatibility wrapper for when this function was defined here in
+# the plugin, before being pulled in to core lib/git.zsh as git_current_branch()
+# to fix the core -> git plugin dependency.
 function current_branch() {
-  local ref
-  ref=$($_omz_git_git_cmd symbolic-ref --quiet HEAD 2> /dev/null)
-  local ret=$?
-  if [[ $ret != 0 ]]; then
-    [[ $ret == 128 ]] && return  # no git repo.
-    ref=$($_omz_git_git_cmd rev-parse --short HEAD 2> /dev/null) || return
-  fi
-  echo ${ref#refs/heads/}
+  git_current_branch
 }
 # The list of remotes
 function current_repository() {
@@ -99,7 +92,7 @@ alias gfo='git fetch origin'
 alias gg='git gui citool'
 alias gga='git gui citool --amend'
 ggf() {
-[[ "$#" != 1 ]] && local b="$(current_branch)"
+[[ "$#" != 1 ]] && local b="$(git_current_branch)"
 git push --force origin "${b:=$1}"
 }
 compdef _git ggf=git-checkout
@@ -107,23 +100,23 @@ ggl() {
 if [[ "$#" != 0 ]] && [[ "$#" != 1 ]]; then
 git pull origin "${*}"
 else
-[[ "$#" == 0 ]] && local b="$(current_branch)"
+[[ "$#" == 0 ]] && local b="$(git_current_branch)"
 git pull origin "${b:=$1}"
 fi
 }
 compdef _git ggl=git-checkout
-alias ggpull='git pull origin $(current_branch)'
+alias ggpull='git pull origin $(git_current_branch)'
 compdef _git ggpull=git-checkout
 ggp() {
 if [[ "$#" != 0 ]] && [[ "$#" != 1 ]]; then
 git push origin "${*}"
 else
-[[ "$#" == 0 ]] && local b="$(current_branch)"
+[[ "$#" == 0 ]] && local b="$(git_current_branch)"
 git push origin "${b:=$1}"
 fi
 }
 compdef _git ggp=git-checkout
-alias ggpush='git push origin $(current_branch)'
+alias ggpush='git push origin $(git_current_branch)'
 compdef _git ggpush=git-checkout
 ggpnp() {
 if [[ "$#" == 0 ]]; then
@@ -133,9 +126,9 @@ ggl "${*}" && ggp "${*}"
 fi
 }
 compdef _git ggpnp=git-checkout
-alias ggsup='git branch --set-upstream-to=origin/$(current_branch)'
+alias ggsup='git branch --set-upstream-to=origin/$(git_current_branch)'
 ggu() {
-[[ "$#" != 1 ]] && local b="$(current_branch)"
+[[ "$#" != 1 ]] && local b="$(git_current_branch)"
 git pull --rebase origin "${b:=$1}"
 }
 compdef _git ggu=git-checkout

themes/eastwood.zsh-theme

@@ -14,9 +14,9 @@ ZSH_THEME_GIT_PROMPT_CLEAN=""
 
 # Customized git status, oh-my-zsh currently does not allow render dirty status before branch
 git_custom_status() {
-  local cb=$(current_branch)
+  local cb=$(git_current_branch)
   if [ -n "$cb" ]; then
-    echo "$(parse_git_dirty)$ZSH_THEME_GIT_PROMPT_PREFIX$(current_branch)$ZSH_THEME_GIT_PROMPT_SUFFIX"
+    echo "$(parse_git_dirty)$ZSH_THEME_GIT_PROMPT_PREFIX$(git_current_branch)$ZSH_THEME_GIT_PROMPT_SUFFIX"
   fi
 }
 

themes/gallois.zsh-theme

+# Depends on the git plugin for work_in_progress()
+
 ZSH_THEME_GIT_PROMPT_PREFIX="%{$reset_color%}%{$fg[green]%}["
 ZSH_THEME_GIT_PROMPT_SUFFIX="]%{$reset_color%}"
 ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[red]%}*%{$reset_color%}"
@@ -5,9 +7,9 @@ ZSH_THEME_GIT_PROMPT_CLEAN=""
 
 #Customized git status, oh-my-zsh currently does not allow render dirty status before branch
 git_custom_status() {
-  local cb=$(current_branch)
+  local cb=$(git_current_branch)
   if [ -n "$cb" ]; then
-    echo "$(parse_git_dirty)%{$fg_bold[yellow]%}$(work_in_progress)%{$reset_color%}$ZSH_THEME_GIT_PROMPT_PREFIX$(current_branch)$ZSH_THEME_GIT_PROMPT_SUFFIX"
+    echo "$(parse_git_dirty)%{$fg_bold[yellow]%}$(work_in_progress)%{$reset_color%}$ZSH_THEME_GIT_PROMPT_PREFIX$(git_current_branch)$ZSH_THEME_GIT_PROMPT_SUFFIX"
   fi
 }
 

themes/josh.zsh-theme

@@ -9,7 +9,7 @@ function josh_prompt {
   (( spare_width = ${COLUMNS} ))
   prompt=" "
 
-  branch=$(current_branch)
+  branch=$(git_current_branch)
   ruby_version=$(rvm_prompt_info || rbenv_prompt_info)
   path_size=${#PWD}
   branch_size=${#branch}
@@ -31,7 +31,7 @@ function josh_prompt {
     prompt=" $prompt"
   done
   
-  prompt="%{%F{green}%}$PWD$prompt%{%F{red}%}$(rvm_prompt_info || rbenv_prompt_info)%{$reset_color%} $(current_branch)"
+  prompt="%{%F{green}%}$PWD$prompt%{%F{red}%}$(rvm_prompt_info || rbenv_prompt_info)%{$reset_color%} $(git_current_branch)"
   
   echo $prompt
 }

themes/juanghurtado.zsh-theme

-# Needs Git plugin for current_branch method
-
 # Color shortcuts
 RED=$fg[red]
 YELLOW=$fg[yellow]
@@ -40,4 +38,4 @@ ZSH_THEME_GIT_PROMPT_SHA_AFTER="%{$WHITE%}]"
 PROMPT='
 %{$GREEN_BOLD%}%n@%m%{$WHITE%}:%{$YELLOW%}%~%u$(parse_git_dirty)$(git_prompt_ahead)%{$RESET_COLOR%}
 %{$BLUE%}>%{$RESET_COLOR%} '
-RPROMPT='%{$GREEN_BOLD%}$(current_branch)$(git_prompt_short_sha)$(git_prompt_status)%{$RESET_COLOR%}'
+RPROMPT='%{$GREEN_BOLD%}$(git_current_branch)$(git_prompt_short_sha)$(git_prompt_status)%{$RESET_COLOR%}'

themes/mortalscumbag.zsh-theme

@@ -5,7 +5,7 @@ function my_git_prompt() {
   STATUS=""
 
   # is branch ahead?
-  if $(echo "$(git log origin/$(current_branch)..HEAD 2> /dev/null)" | grep '^commit' &> /dev/null); then
+  if $(echo "$(git log origin/$(git_current_branch)..HEAD 2> /dev/null)" | grep '^commit' &> /dev/null); then
     STATUS="$STATUS$ZSH_THEME_GIT_PROMPT_AHEAD"
   fi
 
@@ -37,7 +37,7 @@ function my_git_prompt() {
 }
 
 function my_current_branch() {
-  echo $(current_branch || echo "(no branch)")
+  echo $(git_current_branch || echo "(no branch)")
 }
 
 function ssh_connection() {

themes/peepcode.zsh-theme

@@ -28,7 +28,7 @@ git_dirty() {
 }
 
 git_prompt() {
-  local cb=$(current_branch)
+  local cb=$(git_current_branch)
   if [ -n "$cb" ]; then
     local repo_path=$(git_repo_path)
     echo " %{$fg_bold[grey]%}$cb %{$fg[white]%}$(git_commit_id)%{$reset_color%}$(git_mode)$(git_dirty)"

themes/sunrise.zsh-theme

 # Sunrise theme for oh-my-zsh
 # Intended to be used with Solarized: http://ethanschoonover.com/solarized
-# (Needs Git plugin for current_branch method)
 
 # Color shortcuts
 R=$fg_no_bold[red]