Add automatic versioning.

Only the Cocoa application target has a corresponding build script phase at present.

Cocoa/Info.plist

@@ -48,11 +48,11 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.6 cvs</string>
+	<string></string>
 	<key>CFBundleSignature</key>
 	<string>ResK</string>
 	<key>CFBundleVersion</key>
-	<string>19</string>
+	<string></string>
 	<key>NSAppleScriptEnabled</key>
 	<true/>
 	<key>NSMainNibFile</key>

ResKnife.xcodeproj/project.pbxproj

@@ -1604,6 +1604,7 @@
 				E18BF56F069FEA1300F076B8 /* Sources */,
 				E18BF586069FEA1300F076B8 /* Frameworks */,
 				E18BF589069FEA1300F076B8 /* Rez */,
+				0EF0A9D818B18F3D00BF3F47 /* Run Versioning Script */,
 			);
 			buildRules = (
 			);
@@ -2027,6 +2028,24 @@
 		};
 /* End PBXRezBuildPhase section */
 
+/* Begin PBXShellScriptBuildPhase section */
+		0EF0A9D818B18F3D00BF3F47 /* Run Versioning Script */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			name = "Run Versioning Script";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "${PROJECT_DIR}/Scripts/build-version.sh";
+			showEnvVarsInLog = 0;
+		};
+/* End PBXShellScriptBuildPhase section */
+
 /* Begin PBXSourcesBuildPhase section */
 		8415918618AFE39B00306B4F /* Sources */ = {
 			isa = PBXSourcesBuildPhase;

Scripts/build-version.sh

@@ -0,0 +1,62 @@
+#!/bin/sh
+
+# This script automatically sets the version and short version string of
+# an Xcode project from the Git repository containing the project.
+#
+# To use this script in Xcode, add the script's path to a "Run Script" build
+# phase for your application target.
+
+set -o errexit
+set -o nounset
+
+# First, check for git in $PATH
+hash git 2>/dev/null || { echo >&2 "Git required, not installed.  Aborting build number update script."; exit 0; }
+
+# Alternatively, we could use Xcode's copy of the Git binary,
+# but old Xcodes don't have this.
+#GIT=$(xcrun -find git)
+
+# Run Script build phases that operate on product files of the target that defines them should use the value of this build setting [TARGET_BUILD_DIR]. But Run Script build phases that operate on product files of other targets should use “BUILT_PRODUCTS_DIR” instead.
+INFO_PLIST="${TARGET_BUILD_DIR}/${INFOPLIST_PATH}"
+
+# Build version (closest-tag-or-branch "-" commits-since-tag "-" short-hash dirty-flag)
+BUILD_VERSION=$(git describe --tags --always --dirty=+)
+
+# Use the latest tag for short version (expected tag format "n[.n[.n]]")
+LATEST_TAG=$(git describe --tags --abbrev=0)
+COMMIT_COUNT_SINCE_TAG=$(git rev-list --count ${LATEST_TAG}..)
+if [ $LATEST_TAG = "start" ]
+  then LATEST_TAG=0
+fi
+if [ $COMMIT_COUNT_SINCE_TAG = 0 ]
+  then SHORT_VERSION="$LATEST_TAG"
+  else SHORT_VERSION="${LATEST_TAG}d${COMMIT_COUNT_SINCE_TAG}"
+fi
+
+# Bundle version (commits-on-master-until-branch "." commits-on-branch)
+# Assumes that two release branches will not diverge from the same commit on master.
+if [ $(git rev-parse --abbrev-ref HEAD) = "master" ]; then
+  MASTER_COMMIT_COUNT=$(git rev-list --count HEAD)
+  BRANCH_COMMIT_COUNT=0
+  BUNDLE_VERSION="$MASTER_COMMIT_COUNT"
+else
+  MASTER_COMMIT_COUNT=$(git rev-list --count $(git rev-list master.. | tail -n 1)^)
+  BRANCH_COMMIT_COUNT=$(git rev-list --count master..)
+  if [ $BRANCH_COMMIT_COUNT = 0 ]
+    then BUNDLE_VERSION="$MASTER_COMMIT_COUNT"
+    else BUNDLE_VERSION="${MASTER_COMMIT_COUNT}.${BRANCH_COMMIT_COUNT}"
+  fi
+fi
+
+defaults write "$INFO_PLIST" CFBundleBuildVersion "$BUILD_VERSION"
+defaults write "$INFO_PLIST" CFBundleShortVersionString "$SHORT_VERSION"
+defaults write "$INFO_PLIST" CFBundleVersion "$BUNDLE_VERSION"
+
+# For debugging:
+#echo "BUILD VERSION: $BUILD_VERSION"
+#echo "LATEST_TAG: $LATEST_TAG"
+#echo "COMMIT_COUNT_SINCE_TAG: $COMMIT_COUNT_SINCE_TAG"
+#echo "SHORT VERSION: $SHORT_VERSION"
+#echo "MASTER_COMMIT_COUNT: $MASTER_COMMIT_COUNT"
+#echo "BRANCH_COMMIT_COUNT: $BRANCH_COMMIT_COUNT"
+#echo "BUNDLE_VERSION: $BUNDLE_VERSION"