# Copyright (C) 2022 The Syncthing Authors.
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at https://mozilla.org/MPL/2.0/.

#!/bin/sh

# List known operating system/architecture combos, removing the
# architecture, and making constants of them.

osname() {
    echo "$1" | awk '{print toupper(substr($1, 1, 1)) substr($1, 2)}' \
        | sed s/aix/AIX/i \
        | sed s/bsd/BSD/i \
        | sed s/ios/IOS/i \
        | sed s/js/JS/i
}

osconstants() {
    echo "// Code generated by runtimeos.sh. DO NOT EDIT."
    echo "package build"
    echo "import \"runtime\""

    echo "const ("
    for OS in $(go tool dist list | sed 's|/.*||' | sort | uniq) ; do
        name=$(osname "$OS")
        echo "$name = \"$OS\""
    done
    echo ")"
    echo

    echo "const ("
    for OS in $(go tool dist list | sed 's|/.*||' | sort | uniq) ; do
        name=$(osname "$OS")
        echo "Is$name = runtime.GOOS == $name"
    done
    echo ")"
}

osconstants > runtimeos.gen.go

gofmt -w -s runtimeos.gen.go