Add a "Generate Icons" build phase

Author: mattrubin

Authenticator.xcodeproj/project.pbxproj

@@ -341,6 +341,7 @@
 			buildConfigurationList = 1D6058960D05DD3E006BFB54 /* Build configuration list for PBXNativeTarget "Authenticator" */;
 			buildPhases = (
 				7D745802100A4933AC7F63D5 /* Check Pods Manifest.lock */,
+				C959A63F190A6CB10042DEC0 /* Generate Icons */,
 				1D60588D0D05DD3D006BFB54 /* Resources */,
 				1D60588E0D05DD3D006BFB54 /* Sources */,
 				1D60588F0D05DD3D006BFB54 /* Frameworks */,
@@ -457,6 +458,21 @@
 			shellScript = "\"${SRCROOT}/Pods/Pods-resources.sh\"\n";
 			showEnvVarsInLog = 0;
 		};
+		C959A63F190A6CB10042DEC0 /* Generate Icons */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputPaths = (
+			);
+			name = "Generate Icons";
+			outputPaths = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/bash;
+			shellScript = "PATH=${PATH}:/usr/local/bin\ncd \"${SRCROOT}/Authenticator/Resources/\"\n./GenerateIcons.sh";
+			showEnvVarsInLog = 0;
+		};
 /* End PBXShellScriptBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */

Authenticator/Resources/GenerateIcons.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+hash inkscape 2>/dev/null || { echo >&2 "Icon generation requires inkscape. Using existing icons instead."; exit 0; }
+hash pngcrush 2>/dev/null || { echo >&2 "Icon generation requires pngcrush. Using existing icons instead."; exit 0; }
+
 # Generate App Icons
 inkscape -z -e "Icon-29@2x.png" -w 58 "Icon.svg";
 inkscape -z -e "Icon-40@2x.png" -w 80 "Icon.svg";