Add support for zsh

[geksiong]

This is my attempt to make bash-git-prompt work with zsh, by modifying the bash scripts without introducing additional scripts. It assumes the zsh colors module is loaded.

Disclaimer: I'm new to zsh scripting as I recently switched to zsh. It seems to work fine on my system so far, but may need more testing.

ps. It still works with bash

[MPLew-is]

I'm also very new to zsh, but couldn't seem to get this to work; am I doing something incorrectly? Here's the excerpt from my ~/.zshrc:

autoload -U colors && colors
  
if [ -f "${HOME}/Projects/bash-git-prompt/gitprompt.sh" ]; then
    __GIT_PROMPT_DIR="${HOME}/Projects/bash-git-prompt"
    source "${HOME}/Projects/bash-git-prompt/gitprompt.sh"
fi

where ${HOME}/Projects/bash-git-prompt is where I have your zsh-support branch checked out.

[geksiong]

Because bash-git-prompt sets $PROMPT_COMMAND which is specific to bash only, you need to add the following to get the prompt to take effect in zsh: precmd() { eval $PROMPT_COMMAND}

[MPLew-is]

Thanks, I was able to get it displaying, and have submitted a pull request into your fork to correct a few issues I found. In addition, one remaining issue that I'm seeing is that my prompt doesn't expand ${GIT_BRANCH}:

~/Projects/bash-git-prompt [${GIT_BRANCH}|✔] 

The root cause of this is the escaped \${GIT_BRANCH} in gitprompt.sh, and going through git blame it looks like this was introduced as a security fix. Removing the indirection (that is, changing \${GIT_BRANCH} to just ${GIT_BRANCH}) fixes the issue, but I do not know enough about the security issue that that fix was designed to prevent to know if that's a good fix.

[MPLew-is]

@magicmonty or @ogr3 do you know if it's safe to just leave ${GIT_BRANCH} unescaped on zsh? It looks like at least one level of evaluation is removed using the different shell, which might eliminate that issue entirely.

[andruten]

I'm also interested in this feature! I've checked out your branch and works like a charm adding @MPLew-is snippet and precmd function at the end of .zshrc. It works like a charm! Thank you!

[sandrotosi]

what's the purpose of this PR? i think this project is a port for bash of https://github.com/olivierverdier/zsh-git-prompt , which provides support for customizing the zsh prompt for git. can you use that instead?