Add support for setting command-line options via a JSON config file

ddcli/DDGetoptLongParser.h

@@ -85,6 +85,7 @@ typedef struct
     int mCurrentOption;
     NSMutableArray * mUtf8Data;
     DDGetoptFunction mGetoptFunction;
+    NSString *mArgumentsFilename;
 }
 
 /**
@@ -176,6 +177,15 @@ typedef struct
 - (NSArray *) parseOptionsWithArguments: (NSArray *) arguments
                                 command: (NSString *) command;
 
+/**
+ * If set, provides the name of a file, located in the current working
+ * directory, containing command-line arguments in a simple JSON array
+ *
+ * @param filename Name of the file to look for in the current working directory
+ */
+
+- (void)setArgumentsFilename:(NSString*)filename;
+
 @end
 
 /**

ddcli/DDGetoptLongParser.m

@@ -73,6 +73,7 @@ - (void) dealloc
     [mOptionString release];
     [mOptionsData release];
     [mUtf8Data release];
+    [mArgumentsFilename release];
 
     [super dealloc];
 }
@@ -87,6 +88,10 @@ - (void) setTarget: (id) target
     mTarget = target;
 }
 
+- (void) setArgumentsFilename:(NSString *)filename
+{
+    mArgumentsFilename = [filename copy];
+}
 
 - (void) setGetoptLongOnly: (BOOL) getoptLongOnly
 {
@@ -163,6 +168,33 @@ - (NSArray *) parseOptions
 {
     NSProcessInfo * processInfo = [NSProcessInfo processInfo];
     NSArray * arguments = [processInfo arguments];
+
+    if (mArgumentsFilename != nil) {
+        if (NSClassFromString(@"NSJSONSerialization") == nil) {
+            fprintf(stderr, "Warning: ignoring %s, feature supported from OS X 10.7 onwards\n", [mArgumentsFilename UTF8String]);
+        } else {
+            NSFileManager *fm = [NSFileManager defaultManager];
+            NSString *argumentsFilePath = [[fm currentDirectoryPath] stringByAppendingPathComponent:mArgumentsFilename];
+            if ([fm fileExistsAtPath:argumentsFilePath]) {
+                NSError *error;
+                NSArray *argumentsFromFile = [NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfFile:argumentsFilePath] options:0 error:&error];
+                if (argumentsFromFile != nil) {
+                    NSAssert([arguments count] > 0, @"Process has no arguments (not even the command). Weird.");
+                    NSString *command = [arguments objectAtIndex:0];
+                    arguments = [arguments subarrayWithRange:NSMakeRange(1, [arguments count] - 1)];
+
+                    NSMutableArray *mutableArguments = [NSMutableArray arrayWithObject:command];
+                    [mutableArguments addObjectsFromArray:argumentsFromFile];
+                    [mutableArguments addObjectsFromArray:arguments];
+                    arguments = [NSArray arrayWithArray:mutableArguments];
+                } else {
+                    fprintf(stderr, "Error reading %s: %s\n", [mArgumentsFilename UTF8String], [[error localizedDescription] UTF8String]);
+                    exit(1);
+                }
+            }
+        }
+    }
+
     NSString * command = [processInfo processName];
     return [self parseOptionsWithArguments: arguments command: command];
 }

mogenerator.m

@@ -608,6 +608,7 @@ - (void)application:(DDCliApplication*)app
     {nil,                   0,      0},
     };
     [optionsParser addOptionsFromTable:optionTable];
+    [optionsParser setArgumentsFilename:@".mogenerator-args"];
 }
 
 - (void)printUsage {