git-xcode-tag

#!/bin/bash

COMMAND="$(basename "$0")"

OPTIONS="${COMMAND} [-n] [-t vers] plist-files...

Apply semantic versioning to an Xcode project.  The semantic version
may be specified on the command line or extracted from annotated tags
in the repository.

If there are no files supplied on the command-line, $COMMAND
will use the contents of the environment variable INFOPLIST_FILE.
This behavior is deprecated and will generate a warning.
--
    General Flags

h,help!         show help
t,tag!=semver   set the semantic version to be used

    Diagnostics

n,dry-run!      do not modify the files; just show the commands
v,verbose       increase verbosity
"

eval "$(
     echo "$OPTIONS" |
          git rev-parse --parseopt -- "$@" ||
     echo exit $?
)"

DRY_RUN=0 VERBOSE=0

log_note () {
    echo >&2 "${COMMAND}: note: $*"
}

log_debug () {
    ((VERBOSE > 0)) && log_note "$*"
}

log_trace () {
    ((VERBOSE > 1)) && log_note "$*"
}

log_warning () {
    echo >&2 "${COMMAND}: warning: $*"
}

log_error () {
    echo >&2 "${COMMAND}: error: $*"
}

while (($# > 0))
do
    OPT="$1"; shift

    case "${OPT}" in
        --) break;;
        -n) DRY_RUN=1;;
        -t) export SEMANTIC_VERSION="$1"; shift;;
        -v) ((++VERBOSE));;

        --no-verbose) VERBOSE=0;;

        *) log_warning "ignoring unsupported flag '${OPT}'";;
    esac
done

if [[ $# == 0 && -f "${INFOPLIST_FILE}" ]]; then
    log_warning "Using INFOPLIST_FILE as target file"
    set -- "${INFOPLIST_FILE}"
fi

if [[ $# == 0 ]]; then
    log_error "no files specified on command line"
    exit 2
fi

# If --dry-run was specified but the verbosity was not, set the
# verbosity to 1.

((DRY_RUN && !VERBOSE)) && VERBOSE=1

# In most cases, the git-semver utility should be bundled with this
# script in the repository.

GIT_SEMVER="$(dirname "$0")/git-semver"

# On the off-chance it is not, fall back on an installed version.

[[ ! -x "${GIT_SEMVER}" ]] && GIT_SEMVER="git semver"

SEMANTIC_VERSION="$($GIT_SEMVER)" || exit $?

get_info () {
    local result
    result="$(/usr/libexec/PlistBuddy -c "Print :$1" "${PLIST_FILE}")"
    log_trace "${PLIST_FILE}: get $1 => ${result}"
    echo "${result}"
}

set_info () {
    if ((DRY_RUN)); then
        log_note "${PLIST_FILE}: would set $1 to $2"
    else
        log_debug "${PLIST_FILE}: set $1 to $2"
        /usr/libexec/PlistBuddy -c "Set :$1 $2" "${PLIST_FILE}"
    fi
}

# Determine the workspace status BEFORE modifying any Info.plist
# files, or we will get spurious version bumps.

DIRTY=0

if [[ "$(git describe --always --dirty)" == *-dirty ]]; then
    DIRTY=1
    log_trace "workspace dirty; will bump build number"
fi

for PLIST_FILE; do
    if ! /usr/bin/plutil -convert xml1 "${PLIST_FILE}"; then
        log_warning "${PLIST_FILE}: No such file, skipped"
        continue
    fi

    BUILD_NUM="$(get_info CFBundleVersion)"
    CURRENT_VERSION="$(get_info CFBundleShortVersionString)"

    if ((DIRTY)); then
        set_info CFBundleVersion $((BUILD_NUM + 1))
    fi

    if [[ "x${CURRENT_VERSION}" != "x${SEMANTIC_VERSION}" ]]; then
        set_info CFBundleShortVersionString "'${SEMANTIC_VERSION}'"
    fi
done