Parse and bump version strings

bump.sh

#!/usr/bin/env bash

set -euo pipefail

if test -z "$*"; then
    echo "Missing argument, e.g. $0 classic/Fastbind" >&2
    exit 1
fi

if ! test -d "$1"; then
    echo "$1 is not a directory" >&2
    exit 1
fi

platform="$(dirname "$1")"
name="$(basename "$1")"
toc="$platform/$name/$name.toc"

if ! test -f "$toc"; then
    echo "$toc is not a file" >&2
    exit 1
fi

version="$(grep -Po "Version: \K.+" "$toc")"
major="$(echo "$version" | cut -f1 -d.)"
minor="$(echo "$version" | cut -f2 -d.)"
patch="$(echo "$version" | cut -f3 -d.)"

if test $# -eq 1 || test "$2" = "patch"; then
    patch=$((patch + 1))
elif test "$2" = "minor"; then
    patch=0
    minor=$((minor + 1))
elif test "$2" = "major"; then
    patch=0
    minor=0
    major=$((major + 1))
fi

if echo sed -i "'s/Version: $version/Version: $major.$minor.$patch/'" "$toc"; then
    echo "Bumping $1 from $version to $major.$minor.$patch"
    git commit -m "Bumping $1 from $version to $major.$minor.$patch" "$toc"
    git tag "$platform/$name/$major.$minor.$patch"
fi