Put Git Branch on Your Bash Prompt / Gitのブランチ名をbashのプロンプトに表示させる

最近仕事でgitを使うようになった(3月からテキサス州オースティンにいます)ので、PS1をいじって以下のようにブランチ名がプロンプトに表示されるようにしてみました。未commitの変更があると赤くなります。

僕は以下に適当な名前をつけて.bashrcからsourceして使っています。Ubuntu12.04とRHEL5では動いてるっぽいです。bash_completionがないと動かないです。色のあたりは完全にgitと関係ないおまけです。

#  Predefined colors.  Makes reading code easier than escape sequences.
#  I don't remember where I found this.

# Reset
Color_Off="\[\033[0m\]"       # Text Reset

# Regular Colors
Black="\[\033[0;30m\]"        # Black
Red="\[\033[0;31m\]"          # Red
Green="\[\033[0;32m\]"        # Green
Yellow="\[\033[0;33m\]"       # Yellow
Blue="\[\033[0;34m\]"         # Blue
Purple="\[\033[0;35m\]"       # Purple
Cyan="\[\033[0;36m\]"         # Cyan
White="\[\033[0;37m\]"        # White

# Bold
BBlack="\[\033[1;30m\]"       # Black
BRed="\[\033[1;31m\]"         # Red
BGreen="\[\033[1;32m\]"       # Green
BYellow="\[\033[1;33m\]"      # Yellow
BBlue="\[\033[1;34m\]"        # Blue
BPurple="\[\033[1;35m\]"      # Purple
BCyan="\[\033[1;36m\]"        # Cyan
BWhite="\[\033[1;37m\]"       # White

# Underline
UBlack="\[\033[4;30m\]"       # Black
URed="\[\033[4;31m\]"         # Red
UGreen="\[\033[4;32m\]"       # Green
UYellow="\[\033[4;33m\]"      # Yellow
UBlue="\[\033[4;34m\]"        # Blue
UPurple="\[\033[4;35m\]"      # Purple
UCyan="\[\033[4;36m\]"        # Cyan
UWhite="\[\033[4;37m\]"       # White

# Background
On_Black="\[\033[40m\]"       # Black
On_Red="\[\033[41m\]"         # Red
On_Green="\[\033[42m\]"       # Green
On_Yellow="\[\033[43m\]"      # Yellow
On_Blue="\[\033[44m\]"        # Blue
On_Purple="\[\033[45m\]"      # Purple
On_Cyan="\[\033[46m\]"        # Cyan
On_White="\[\033[47m\]"       # White

# High Intensty
IBlack="\[\033[0;90m\]"       # Black
IRed="\[\033[0;91m\]"         # Red
IGreen="\[\033[0;92m\]"       # Green
IYellow="\[\033[0;93m\]"      # Yellow
IBlue="\[\033[0;94m\]"        # Blue
IPurple="\[\033[0;95m\]"      # Purple
ICyan="\[\033[0;96m\]"        # Cyan
IWhite="\[\033[0;97m\]"       # White

# Bold High Intensty
BIBlack="\[\033[1;90m\]"      # Black
BIRed="\[\033[1;91m\]"        # Red
BIGreen="\[\033[1;92m\]"      # Green
BIYellow="\[\033[1;93m\]"     # Yellow
BIBlue="\[\033[1;94m\]"       # Blue
BIPurple="\[\033[1;95m\]"     # Purple
BICyan="\[\033[1;96m\]"       # Cyan
BIWhite="\[\033[1;97m\]"      # White

# High Intensty backgrounds
On_IBlack="\[\033[0;100m\]"   # Black
On_IRed="\[\033[0;101m\]"     # Red
On_IGreen="\[\033[0;102m\]"   # Green
On_IYellow="\[\033[0;103m\]"  # Yellow
On_IBlue="\[\033[0;104m\]"    # Blue
On_IPurple="\[\033[10;95m\]"  # Purple
On_ICyan="\[\033[0;106m\]"    # Cyan
On_IWhite="\[\033[0;107m\]"   # White

# Various variables you might want for your PS1 prompt instead
Time12h="\T"
Time12a="\@"
PathShort="\w"
PathFull="\W"
NewLine="\n"
Jobs="\j"

# Put git branch into the prompt

if [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
    export PS1=$NewLine'$(git branch &>/dev/null;\
    if [ $? -eq 0 ]; then \
        echo "$(echo `git status` | grep "nothing to commit" > /dev/null 2>&1; \
        if [ "$?" -eq "0" ]; then \
            # Clean repository - nothing to commit
            echo "'$BGreen'"$(__git_ps1 "(%s)"); \
        else \
            # Changes to working tree
            echo "'$BRed'"$(__git_ps1 "{%s}"); \
        fi) '$BYellow"\u"$BGreen@$UPurple"\h"$Color_Off$BGreen:$BCyan$PathShort" $BWhite(\D{%Y-%m-%d} \t)"$Color_Off$NewLine'\$ "; \
    else \
        # Prompt when not in GIT repo
        echo "'$BYellow"\u"$BGreen@$UPurple"\h"$Color_Off$BGreen:$BCyan$PathShort" $BWhite(\D{%Y-%m-%d} \t)"$Color_Off$NewLine'\$ "; \
    fi)'
else
    export PS1=$NewLine$BYellow"\u"$BGreen@$UPurple"\h"$Color_Off$BGreen:$BCyan$PathShort" $BWhite(\D{%Y-%m-%d} \t)$Color_Off$NewLine\$ "
fi

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