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如何使用shell脚本解析输出命令?

[英]How could I parse an output command with shell scripting?

我正在开发一个shell脚本,该脚本是使用Whiptail的Git接口(shell接口)。

我的问题是,我想创建一个菜单,我们可以在其中选择Git存储库的分支并将此字符串返回到脚本。

我知道如何通过以下方式获得Git分支的不同名称:

git branch

但我不知道如何解析它们以将其传达给Whiptail。

我想统计分支的数量,并以选项的形式逐个进行交流。

例如:

$> git branch
master
asm
release
debug

我想在shell脚本中将Whiptail用作:

                                                     Here the number of branch
                                                                    v
whiptail --tittle "Branch select" --menu "Choose your branch" 20 60 4 \
"1" "master" \
"2" "asm" \ 
"3" "release" \
"4" "debug"

但是我不知道如何解析git branch的输出以将其作为shell脚本获取,请问能帮我吗?

编辑:我终于做到了:) 源代码

我不知道什么是whiptail ,但是前一阵子我写了一个bash函数来列出您最近访问过的所有分支,并为用户提供一个菜单来选择一个。

来源在我在Github上的.bashrc ,我已经在这里复制了它:

# Colors for prompt
COLOR_RED=$(tput sgr0 && tput setaf 1)
COLOR_GREEN=$(tput sgr0 && tput setaf 2)
COLOR_YELLOW=$(tput sgr0 && tput setaf 3)
COLOR_DARK_BLUE=$(tput sgr0 && tput setaf 4)
COLOR_BLUE=$(tput sgr0 && tput setaf 6)
COLOR_PURPLE=$(tput sgr0 && tput setaf 5)
COLOR_PINK=$(tput sgr0 && tput bold && tput setaf 5)
COLOR_LIGHT_GREEN=$(tput sgr0 && tput bold && tput setaf 2)
COLOR_LIGHT_RED=$(tput sgr0 && tput bold && tput setaf 1)
COLOR_LIGHT_CYAN=$(tput sgr0 && tput bold && tput setaf 6)
COLOR_RESET=$(tput sgr0)

# git
function _c() {
    cur=${COMP_WORDS[COMP_CWORD]}
    branches=`git for-each-ref --sort=-committerdate refs/heads/ | head -n 10`

    output=''
    for branch in $branches
    do
        output+=`echo "$branch" | sed 's/.*refs\/heads\///'`
        # creative way to get color here? echo messes everything up
        # (http://unix.stackexchange.com/questions/107417/what-are-the-special-characters-to-print-from-a-script-to-move-the-cursor ?)
        #output+=" '`git show --quiet $(echo $branch | cut -d' ' -f1) --pretty=format:"%C(Yellow)%h %Cred<%an>%Creset %s %C(cyan)(%cr)%Creset'"`"$'\n'
        #echo " \'`git show --quiet $(echo $branch | cut -d' ' -f1) --pretty=format:"%C(Yellow)%h %Cred<%an>%Creset %s %C(cyan)(%cr)%Creset\'"`"$'\n'
        output+=" \'`git show --quiet $(echo $branch | cut -d' ' -f1) --pretty=format:"%h <%an> %s (%cr)\'"`"$'\n'
    done

    response=''
    for branch in $output
    do
        lowerBranch=`echo $branch | tr '[:upper:]' '[:lower:]'`
        if [[ $branch =~ .*$cur.* ]]; then
            response+=$branch$'\n'
        fi
    done

    COMPREPLY=( $( compgen -W "$response" -- $cur ) )
}

function c() {
    newBranch=""
    inputted=""

    if [[ -z "$1" ]]; then
        branchOutput=`git for-each-ref --sort=-committerdate refs/heads/ | head -n 10`

        declare -a branches
        let xx=0

        IFS=$'\n'
        pad=$(printf '%0.1s' " "{1..32})
        padlength=32
        for branch in $branchOutput
        do
            # Show them in a list with a counter
            xx=`expr $xx + 1`
            branches=("${branches[@]}" "$branch")
            branchName=`echo "$branch" | sed 's/.*refs\/heads\///'`
            string1="$COLOR_PURPLE$xx. $COLOR_PINK $branchName"
            uncolor="$xx.  $branchName"
            printf '%s' $string1
            printf '%*.*s' 0 $((padlength - ${#uncolor} )) "$pad"
            printf '%s\n' `git show --quiet $branchName --pretty=format:"%C(Yellow)%h %Cred<%an>%Creset %s %C(cyan)(%cr)%Creset"`
        done

        # Prompt user for file. -n means no line break after echo
        echo -n "$COLOR_YELLOW?$COLOR_RESET "
        read branchNumber

        let "branchNumber+=-1"

        if [[ "$branchNumber" =~ ^[0-9]+$ ]]; then
            newBranch=`echo "${branches[@]:$branchNumber:1}" | sed 's/.*refs\/heads\///'`

            if [[ -z "$newBranch" ]]; then
                echo "Not real."
                return 1
            fi
        else
            echo "Wtf?"
            return 1
        fi
    else
        inputted=1
        newBranch=`echo "$1" | cut -d' ' -f1`
    fi

    if [[ -n "$1" ]]; then
        echo `git show --quiet "$newBranch" --pretty=format:"%C(Yellow)%h %Cred<%an>%Creset %s %C(cyan)(%cr)%Creset"`
    fi

    if [[ $newBranch =~ ^pr ]]; then
        echo -e "\ngit fetch $newBranch && git checkout $newBranch"
        git fetch $newBranch && git checkout $newBranch
    else
        echo -e "\ngit checkout $newBranch"
        git checkout $newBranch
    fi

}

# add autocompletion to the c command
complete -F _c  c

如果将其放在~/.bashrc并在命令行中运行source ~/.bashrc (或打开新的shell),则只需在git repo中运行命令c ,您将获得如下输出:

它能做什么

或者,您可以简单地键入c tab tab来自动完成分支名称:

还有什么

这花了很多天才能完成,我不希望任何人都经历这个过程。 编写bash来制作合理的UI很麻烦。

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