Bash - GIT small snippet for branch management

Question

Stupid Saturday morning code snippet.

I've found online a snippet code that allows me to get the current branch in PS1, wonderful! but...

I'd like to have different colors based on the branch.

I said, "You don't know anything about bash but should be really easy! just an if..."

After 6 hours of tests, here we go.

Could someone explain me where is the problem?

I know that there are many projects on GitHub that do this job for me, but I would like just to understand.

Thank you so much

parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'

}

set_ps1_git_branch_color(){
    BRANCH=$(parse_git_branch)
    if [ $BRANCH == "(master)" ]; then
        echo -e "\W\[\033[35m\] $BRANCH \[\033[00m\]"
    fi
    if [ $BRANCH == "(test)" ]; then
        echo -e "\W\[\033[32m\] $BRANCH \[\033[00m\]"
    fi         
}
export PS1="\u@\h $(set_ps1_git_branch_color) $ "

It works just if I execute source ~/.bash_profile after each git operations ( like checkout ).

But the original snippet parse_git_branch() is able to change the branch name without the source command.

so...what I'm missing here? :(

only one equal symbol = is enough in bash for conditionals and is the right syntax — OscarAkaElvis
– OscarAkaElvis, Commented Jan 28, 2017 at 11:52

CodeWizard · Accepted Answer · 2017-01-28 12:02:23Z

3

You have few errors:

 export PS1="\u@\h $(set_ps1_git_branch_color) $ "

 # should be (added \ before $(set...))
 # the \ will execute the command during runtime and not right now.
 # without the \ it will executed and determined of first run and not every time
 export PS1="\u@\h \$(set_ps1_git_branch_color) $ "

Colors format:

# Output colors
red='\033[0;31m';
green='\033[0;32m';
yellow='\033[0;33m';
default='\033[0;m';

Update script with the colors:

set_ps1_git_branch_color(){
    ...
    echo -e "${green} $BRANCH ${default}"
}

Fixed script to copy and paste

# Output colors
red='\033[0;31m';
green='\033[0;32m';
yellow='\033[0;33m';
default='\033[0;m';

parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'

}

set_ps1_git_branch_color(){
    BRANCH=$(parse_git_branch)
    if [ $BRANCH == "(master)" ]; then
        echo -e "${green} $BRANCH ${default}"
    fi
    if [ $BRANCH == "(test)" ]; then
        echo -e "${yellow} $BRANCH ${default}"
    fi
}

export PS1="\u@\h \$(set_ps1_git_branch_color) $ "

edited Jan 28, 2017 at 12:02

answered Jan 28, 2017 at 11:25

CodeWizard

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3 Comments

Dario Over a year ago

yeah definitely you have saved me from a big fight against shell script. THANK YOU SO MUCH!

CodeWizard Over a year ago

Yep. :-) glad to help.

yaitloutou Over a year ago

the null dive in window is /nul instead of /dev/null, so you may want to redirect the stderr to it with 2> /nul to make sure that the errors will not popup

Dario · Accepted Answer · 2017-01-31 12:50:15Z

2

Just in case someone is interested.

This script show the branch in PS1, if the branch is 'master' the name will be red and blinking if the branch is 'test' the name will be yellow and blinking. For others branches, the colour will be white.

# Output colors
red='\033[31;5m';
white='\033[0;97m';
yellow='\033[33;5m';
default='\033[0;m';
blue='\033[0;34m';
magenta='\033[0;35m';
cyan='\033[0;36m';

parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'
}

set_ps1_git_branch_color(){
    BRANCH=$(parse_git_branch)
    if [ -z $BRANCH ]; then
        return 0
    fi
    if [ $BRANCH = "(master)" ]; then
        echo -e "${red}${BRANCH}${default}"
        return 0
    fi
    if [ $BRANCH = "(test)" ]; then
        echo -e "${yellow}${BRANCH}${default}"
        return 0
    fi
    echo -e "${white}${BRANCH}${default}"
}

export PS1="${cyan}\h ${magenta}\u ${blue}\w\$(set_ps1_git_branch_color)${default} \n\\$ \[$(tput sgr0)\]"

Thank you so much CodeWizard! :)

edited Jan 31, 2017 at 12:50

answered Jan 28, 2017 at 14:51

Dario

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1 Comment

CodeWizard Over a year ago

Cool :-) glad to help up out. Feel free to vote on the original answer so people will know why its working for you now.

Collectives™ on Stack Overflow

Bash - GIT small snippet for branch management

2 Answers 2

You have few errors:

Colors format:

Update script with the colors:

Fixed script to copy and paste

3 Comments

1 Comment

Your Answer

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Collectives™ on Stack Overflow

2 Answers 2

You have few errors:

Colors format:

Update script with the colors:

Fixed script to copy and paste

3 Comments

1 Comment

Your Answer

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