iOS automatic version script

version.sh

#!/bin/sh

###
# Version: $Major.$Minor.$Commit
#
# How it works:
# 1. To roll minor number, tag each App Store release with a message.
# 2. To roll major number, create an additional tag on the last App Store
#    release (e.g. "2.17.9") with new major number (e.g. "3").
# 3. `Release` builds require a clean working directory.
# 4. Non-`Release` builds have a commit number of '0'.
#
# Where it goes:
# 1. Pass no arguments to write to the target's derived Info.plist
# 2. Pass 'print marketing' or 'print build' to echo that version number to stdout
# 3. Pass 'pch' to write to a project-level PCH file for Info.plist preprocessing
###

# Calculate version numbers
build=`git describe | sed -e "s/^[^0-9]*//" | awk '{split($0,d,"-"); split(d[1],v,"."); print v[1] "." ((v[2] == "") ? "0" : (v[2] + 1)) "." d[2]}'`
marketing=`echo $build | awk '{split($0,v,"."); print v[1] "." v[2]}'`

# Send status using stderr
status() { >&2 echo $1; }

# Fix numbers for Release vs Non-Release builds
if [ "Release" = "${CONFIGURATION}" ]; then
    if [[ -n $(git status --porcelain 2> /dev/null | tail -n1) ]]; then
        status "error: The git working directory is dirty. Release version number is calculated for clean builds only."
        exit 1
    else
        status "note: Setting the marketing version to $marketing and the build version to $build."
    fi
else
    status "warning: Changing version from $build to $marketing.0."
    build="$marketing.0"
fi

# Output
if [ "print" = "$1" ]; then
    if [ "marketing" = "$2" ]; then
        echo $marketing
    else
        echo $build
    fi
elif [ "pch" = "$1" ]; then
    # Write version numbers to a project-wide Info.plist preprocessor PCH file
    echo "#define VERSION_BUILD $build" > $PROJECT_TEMP_DIR/VersionNumbers.pch
    echo "#define VERSION_MARKETING $marketing" >> $PROJECT_TEMP_DIR/VersionNumbers.pch
    status "note: Wrote version values to project-level PCH preprocessor file."
else
    # Write version numbers to the target's build-time Info.plist
    plist="$BUILT_PRODUCTS_DIR/$INFOPLIST_PATH"
    `defaults write "$plist" CFBundleShortVersionString "$marketing"`
    `defaults write "$plist" CFBundleVersion "$build"`
    status "note: Wrote version values to target's generated Info.plist."
fi