How to display Git branch names in the shell prompt _linux Shell

One of the benefits of Git is that the branch management of the code becomes an extremely convenient thing, the branch only retains the difference, does not have to copy any files, does not connect the network, quickly creates, uses is deleted. The GIT branch has nothing to do with the complexity of the project, no matter how complicated your project is, creating a git branch is always an instant thing. At the same time, because the information of the parent class branch is preserved, the merging of branches becomes very simple.

When more than one branch is used frequently in a project, you can use the git status command to query which branch you are currently working under, but it is inevitable that when your brain is faint, you forget which branch you are under, and thus have a cup of misoperation.

Then it is no doubt convenient to display the branches in the Shell prompt, no longer need to use the git status command frequently ...

The implementation principle is simple, basically querying the name of the Git branch under the current directory and embedding it in the PS1 variable. Then, the Git branch name can be easily obtained by using the following script:

Copy Code code as follows:

Git branch--no-color 2>/dev/null | Sed-e '/^[^*]/d '-e ' s/* \ (. *\)/(\1)/'

Encapsulate the above script into a function, modify the PS1 variable, embed the function ... This is generally the case. But it also means that every shell activity (such as switching directories, or even just knocking down a carriage return) performs a git ... sed command, so it's a bit of a bummer to start 2 processes at a time.

Fortunately, you can get the GIT branch name in another way, and in each Git project, there is a. git directory, which has a file called Head, which contains the path information for the current branch:

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Ref:refs/heads/branch-name

All we have to do is read the file and then match the path to each other to know the correct branch name. Don't simply split the last branch-name from the head content, because it's not necessarily correct.

Here's how Aaron Crane is implemented:

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# # Parses out of the branch name from. Git/head:
Find_git_branch () {
Local dir=. Head
Until ["$dir"-ef/]; Todo
If [f "$dir/.git/head"]; Then
Head=$ (< "$dir/.git/head")
if [[$head = Ref:\ refs/heads/*]]; Then
Git_branch= "→${head#*/*/}"
elif [[$head!= ']]; Then
Git_branch= "→ (detached)"
Else
Git_branch= "→ (unknow)"
Fi
Return
Fi
Dir= ". /$dir "
Done
Git_branch= '
}

Next, add this function to Prompt_command to ensure that Bash calls this function to get the branch name before creating PROMPT:

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Prompt_command= "Find_git_branch; $PROMPT _command "

Finally, just redefine the PS1 variable:

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# Here's bash color codes can use
black=$ ' \[\e[1;30m\] '
red=$ ' \[\e[1;31m\] '
green=$ ' \[\e[1;32m\] '
yellow=$ ' \[\e[1;33m\] '
blue=$ ' \[\e[1;34m\] '
magenta=$ ' \[\e[1;35m\] '
cyan=$ ' \[\e[1;36m\] '
white=$ ' \[\e[1;37m\] '
normal=$ ' \[\e[m\] '

Ps1= "$white [$magenta \u$white@ $green \h$white: $cyan \w$yellow\ $git _branch$white]\$ $normal"

The above code you can put in ~/.profile or ~/.bash_profile file, my system is Snow Leopard,ps1 defined in/ETC/BASHRC, so I directly modify this file.

The final effect is as follows:

UPDATE–2010/06/23:

If you install the git-completion.sh script that comes with Git, you can also use the method provided by the script:

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Export ps1= "[\u@\h \w" ' $ (__git_ps1 "(%s)") ']\$ '

Ubuntu system, please refer to:/etc/bash_completion.d/git