fish script for fetching, building, switching between different LLVM branches

main.fish

#!/usr/bin/fish
# ----------------------------------------------------------------------------
# "THE BEER-WARE LICENSE" (Revision 42):
# <contact@f0rki.at> wrote this file. As long as you retain this notice you
# can do whatever you want with this stuff. If we meet some day, and you think
# this stuff is worth it, you can buy me a beer in return.
# ----------------------------------------------------------------------------

# prefered git mirror
set -g GIT_MIRROR "https://github.com/llvm-mirror/"
# default version
set -g VERSION "master"
# default number of jobs
set -g JOBS 2
# set the compiler
set -x CC clang
set -x CXX clang++
# build command
set -g BUILD_COMMAND "reslimit ninja"
set -g BUILD_COMMAND_CMAKE "Ninja"
set -g BUILD_COMMAND_JOBS "-j"
# additional cmake options
set -g CMAKE_OPTIONS "-DLLVM_BINUTILS_INCDIR=/usr/include/"
# llvm projects
set -g LLVM_PROJECTS llvm llvm/tools/clang llvm/projects/compiler-rt
# default build dir
set -g BUILD_DIR "llvm-build-master-cmake"

set -g RM_BUILD_DIR 1


###### functions

function fetch_llvm

    echo "[+] git clone/pull'ing"

    for proj in $LLVM_PROJECTS
        set p (basename $proj)
        set pd $p-git
        echo "[+] fetching $p"
        if test -d "./$pd";
            pushd $pd
            git pull
            popd
        else
            git clone "$GIT_MIRROR/$p" $pd
        end
    end

    echo "[+] symlinking if needed"

    for proj in $LLVM_PROJECTS
        set pd (basename $proj)-git
        if test -L $proj; or test -d $proj
            ;
        else
            echo "[+] symlinking $proj to $pd"
            ln -s (realpath ./$pd) $proj
        end
    end

end


function switch_llvm

    set -l argc (count $argv)
    set -l v $VERSION

    if test $argc -ge 1
        set -g VERSION $argv[1]
    end

    set v $VERSION
    if echo "$VERSION" | grep "\." >/dev/null
        set v (echo "release_$VERSION" | sed 's/\.//g')
    end

    fetch_llvm

    for proj in $LLVM_PROJECTS
        set p (basename $proj)
        set pd $p-git
        echo "[+] checking out latest $v for $p"

        pushd $pd
        git checkout $v
        git pull
        popd
    end

    if test $argc -ge 1; and test $argv[1] != "master"
        set -g BUILD_DIR "llvm-build-$argv[1]-cmake"
    end

    echo "[+] setting llvm-build symlink to $BUILD_DIR"
    rm llvm-build
    ln -s (realpath "$BUILD_DIR") llvm-build

end


function build_llvm

    set -l argc (count $argv)
    set -l j $JOBS
    set -l v $VERSION

    if test $argc -ge 2
        set j $argv[2]
    end

    if test $argc -ge 1
        set v $argv[1]
        echo "[+] switching to llvm version $v"
        switch_llvm $v
    else
        pushd llvm-git
        set v (git rev-parse --abbrev-ref HEAD)
        popd
        switch_llvm $v
    end

    echo "[+] Building $v with $j jobs"
    echo "[+] using build dir $BUILD_DIR"
    echo "[+] using $CXX for building"

    if test $RM_BUILD_DIR -eq 1
        echo "[+] cleaning previous build files"
        rm -rf "$BUILD_DIR"
        mkdir "$BUILD_DIR"
    end

    if not pushd "$BUILD_DIR"
        echo "failed to cd into $BUILD_DIR, you can try";
        echo "  ./build-llvm $argv"
        exit 1;
    end

    if test $RM_BUILD_DIR -eq 1
        echo "[+] cmake"
        cmake $CMAKE_OPTIONS -G $BUILD_COMMAND_CMAKE ../llvm-git/
    end

    echo "[+] starting build process: '$BUILD_COMMAND $BUILD_COMMAND_JOBS $j'"
    eval $BUILD_COMMAND $BUILD_COMMAND_JOBS $j
    if test $status -ne 0
        echo "[+] build process failed, retrying with 1 build process"
        eval $BUILD_COMMAND $BUILD_COMMAND_JOBS 1
    end

    popd
    echo "[+] done building llvm $v"
end


#### main

set curfn (basename (status --current-filename))
set argc (count $argv)


if test $curfn = "build-llvm"
    set -g RM_BUILD_DIR 1
    build_llvm $argv
    exit $status
else if test $curfn = "switch-llvm"
    switch_llvm $argv
    exit $status
else if test $curfn = "fetch-llvm"
    fetch_llvm $argv
    exit $status
else if test $curfn = "rebuild-llvm"
    set -g RM_BUILD_DIR 0
    build_llvm $argv
    exit $status
else if test $curfn = "main.fish"
    set -l cmdargv $argv[(seq 2 (count $argv))]
    echo $cmdargv
    if test $argv[1] = "install"
        if test $argc -ge 2
            set dst $argv[2]
            chmod +x (status --current-filename)
            ln -s (realpath $curfn) $dst/build-llvm; or true
            ln -s (realpath $curfn) $dst/rebuild-llvm; or true
            ln -s (realpath $curfn) $dst/switch-llvm; or true
            ln -s (realpath $curfn) $dst/fetch-llvm; or true
        else
            echo "invalid arguments $argv"
            exit 1
        end
    else if test $argv[1] = "build-llvm"
        set -g RM_BUILD_DIR 1
        build_llvm $cmdargv
        exit $status
    else if test $argv[1] = "rebuild-llvm"
        set -g RM_BUILD_DIR 0
        build_llvm $cmdargv
        exit $status
    else if test $argv[1] = "switch-llvm"
        switch_llvm $cmdargv
        exit $status
    else if test $argv[1] = "fetch-llvm"
        fetch_llvm $cmdargv
        exit $status
    end
end

echo "ERROR: cannot handle command $curfn $argv"
exit 1