Load Visual Studio environment in MSYS2.

load-visual-studio-environment.sh

# Visual Studio Environemnt Loader
#
# For MSYS2/Cygwin/etc..
#
# Set the following in your ~/.bashrc:
#
# ENVIRONMENT CONFIGURATION:
#
# To enable static linking where possible:
#
# export VS_ENV_PREFER_STATIC=1
#
# MSVC CONFIGURATION:
#
# See vcvarsall.bat for possible values:
#
# export MSVC_ARCH=x64
#
# VCPKG CONFIGURATION:
#
# VCPKG_ROOT='C:\Users\bob\source\repos\vcpkg'
# VCPKG_TARGET_TRIPLET=x64-windows-static
#

vs_env_main() {
    [ -z "$MSVC_ARCH" ] && set_msvc_arch
    [ -z "$VSCMD_VER" ] && load_vs_environment
    [ -n "$VCPKG_ROOT" ] && setup_vcpkg_environment
    find_cccl || install_cccl && find_cccl
    setup_cccl_environment
}

set_msvc_arch() {
    # Arch defaults to x64.
    export MSVC_ARCH=x64

    if [ "$(uname -o)" = "Msys" ]; then
	case "$MSYSTEM" in
	    MINGW32|CLANG32)
		export MSVC_ARCH=x86
		;;
	esac
    fi
}

load_vs_environment() {
    OLDPWD=$PWD
    cd 'c:/program files/microsoft visual studio/2022/community/vc/auxiliary/build'

    msvc_env_raw=$(mktemp vs_env_rawXXXXX)
    current_vars=$(mktemp vs_env_current_varsXXXXX)
    msvc_env_vars=$(mktemp vs_env_varsXXXXX)

    # Find the set of new vars from the MSVC environment that are
    # not in the present environment.
    env | sed 's/=.*//' | sort > "$current_vars"

    cmd /c 'vcvarsall.bat '"$MSVC_ARCH"' & set' | \
	grep -E '^[^=()]+=' > "$msvc_env_raw"

    sed 's/=.*//' < "$msvc_env_raw" | sort > "$msvc_env_vars"

    # Get only new vars from MSVC env but include PATH.
    trie="PATH|$(comm -23 "$msvc_env_vars" "$current_vars" | \
	paste -sd '|')"

    # Make a map of Windows drives to converted paths.
    drive_map=
    if command -v cygpath >/dev/null; then
	drive_map=$(mount | \
	    sed -n '/^\w: /{s/ .*//p}' | \
	    while read -r drive; do \
		printf '%s\n' "s,$drive,$(cygpath "$drive")/,g"; \
	    done \
	)
    fi

    # Load the MSVC environment with some edits.
    eval "$(grep -E '^('"$trie"')=' "$msvc_env_raw" | sed -E '
	# Quote var values in single quotes, because they use the
        # Windows \ path-part separator.

        s/=(.+)/='\''\1'\''/

        # Setting PATH is special.

        /^PATH=/{
	    # Map Windows drives to converted paths.

	    '"$drive_map"'

            # Prepend existing PATH.

            s/=/="\$PATH:"/

            # Convert Windows ; path entry separator to the :
            # UNIX path entry separator.

            s/;/:/g
	}

        # Export the var.

        s/^/export /
    ')"

    # Remove duplicates from PATH.
    # From: https://unix.stackexchange.com/a/40755/340856
    export PATH="$(printf %s "$PATH" | awk -v RS=: '{
	if (!arr[$0]++) {
	    printf("%s%s", !ln++ ? "" : ":", $0)
	}
    }')"

    # Remove temp files.
    rm -f "$msvc_env_raw" "$current_vars" "$msvc_env_vars"

    cd "$OLDPWD"

    unset OLDPWD msvc_env_raw current_vars msvc_env_vars \
	  trie drive_map
}

find_cccl() {
    if command -v cccl >/dev/null; then
	return 0
    elif [ -x ~/.local/bin/cccl ]; then
	export PATH="$PATH:~/.local/bin"
	return 0
    fi
    return 1
}

install_cccl() {
    OLDPWD=$PWD

    mkdir -p /tmp/cccl-build
    cd /tmp/cccl-build

    curl -sLO "https://github.com/$(\
	curl -sLo - 'https://github.com/swig/cccl/tags' | \
	sed -nE 's/.*"([^"]+\.tar\.gz)".*/\1/p' | \
	head -1 \
    )"

    tar zxf cccl*.tar.gz
    rm cccl*.tar.gz
    cd cccl*

    mkdir -p ~/.local/bin

    cp -f cccl ~/.local/bin
    chmod +x ~/.local/bin/cccl

    cd "$OLDPWD"

    rm -rf /tmp/cccl-build

    unset OLDPWD
}

setup_cccl_environment() {
    for var in CC CXX LD; do
	eval val="\$var"

	case "$val" in
	    cccl|"cccl "*)
		;;
	    *)
		eval "$var"=cccl
		;;
	esac

	unset val
    done

    case "$CCCL_OPTIONS" in
	"/FS"|"* /FS"|"/FS *"|"* /FS *")
	    ;;
	*)
	    if [ -n "$CCCL_OPTIONS" ]; then
		export CCCL_OPTIONS="$CCCL_OPTIONS /FS"
	    else
		export CCCL_OPTIONS="/FS"
	    fi
	    ;;
    esac
}

setup_vcpkg_environment() {
    if [ -z "$VCPKG_TARGET_TRIPLET" ]; then
	export VCPKG_TARGET_TRIPLET="${MSVC_ARCH}-windows${VS_ENV_PREFER_STATIC+-static}"
    fi

    case "$INCLUDE" in
	*[Vv][Cc][Pp][Kk][Gg]*)
	    ;;
	*)
	    export INCLUDE="$INCLUDE;$VCPKG_ROOT"'\installed\'"$VCPKG_TARGET_TRIPLET"'\include'
	    ;;
    esac

    case "$LIB" in
	*[Vv][Cc][Pp][Kk][Gg]*)
	    ;;
	*)
	    export LIB="$LIB;$VCPKG_ROOT"'\installed\'"$VCPKG_TARGET_TRIPLET"'\lib'
	    ;;
    esac
}

vs_env_main "$@"

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