[PATCH 3/3] prompt: colorize ZSH prompt

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Add colors suitable for use in the ZSH prompt.  Having learnt that the
ZSH equivalent of PROMPT_COMMAND is precmd (), you can now use
GIT_PS1_SHOWCOLORHINTS with ZSH.

Signed-off-by: Ramkumar Ramachandra <artagnon@xxxxxxxxx>
---
 contrib/completion/git-prompt.sh | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index 6943f86..e2dd8a8 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@ -20,7 +20,8 @@
 #        <post>, which are strings you would put in $PS1 before
 #        and after the status string generated by the git-prompt
 #        machinery.  e.g.
-#           PROMPT_COMMAND='__git_ps1 "\u@\h:\w" "\\\$ "'
+#        Bash: PROMPT_COMMAND='__git_ps1 "\u@\h:\w" "\\\$ "'
+#        ZSH:  precmd () { __git_ps1 "%n" ":%~$ " "|%s" }
 #        will show username, at-sign, host, colon, cwd, then
 #        various status string, followed by dollar and SP, as
 #        your prompt.
@@ -227,6 +228,43 @@ __git_ps1_show_upstream ()
 # places.
 __git_ps1_colorize_gitstring ()
 {
+	if [[ -n ${ZSH_VERSION-} ]]; then
+		local c_red='%F{red}'
+		local c_green='%F{green}'
+		local c_lblue='%F{blue}'
+		local c_clear='%f'
+		local bad_color=$c_red
+		local ok_color=$c_green
+		local branch_color="$c_clear"
+		local flags_color="$c_lblue"
+		local branchstring="$c${b##refs/heads/}"
+
+		if [ $detached = no ]; then
+			branch_color="$ok_color"
+		else
+			branch_color="$bad_color"
+		fi
+
+		gitstring="$branch_color$branchstring$c_clear"
+
+		if [ -n "$w$i$s$u$r$p" ]; then
+			gitstring="$gitstring$z"
+		fi
+		if [ "$w" = "*" ]; then
+			gitstring="$gitstring$bad_color$w"
+		fi
+		if [ -n "$i" ]; then
+			gitstring="$gitstring$ok_color$i"
+		fi
+		if [ -n "$s" ]; then
+			gitstring="$gitstring$flags_color$s"
+		fi
+		if [ -n "$u" ]; then
+			gitstring="$gitstring$bad_color$u"
+		fi
+		gitstring="$gitstring$c_clear$r$p"
+		return
+	fi
 	local c_red='\e[31m'
 	local c_green='\e[32m'
 	local c_lblue='\e[1;34m'
-- 
1.8.3.rc1.57.g4ac1522

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