gitx/PBEasyPipe.m

//
//  PBEasyPipe.m
//  GitX
//
//  Created by Pieter de Bie on 16-06-08.
//  Copyright 2008 __MyCompanyName__. All rights reserved.
//

#import "PBEasyPipe.h"

@implementation PBEasyPipe

+ (NSFileHandle*) handleForCommand: (NSString*) cmd withArgs: (NSArray*) args
{
	return [self handleForCommand:cmd withArgs:args inDir:nil];
}

+ (NSTask *) taskForCommand:(NSString *)cmd withArgs:(NSArray *)args inDir:(NSString *)dir
{
	NSMutableArray *filteredArguments = [[NSMutableArray alloc] init];
	for (NSString *param in args) {
		if ([param length] > 0) {
			[filteredArguments addObject:param];
		}
	}
	
	NSTask* task = [[NSTask alloc] init];
	[task setLaunchPath:cmd];
	[task setArguments:filteredArguments];
	[filteredArguments release];
	if (dir)
		[task setCurrentDirectoryPath:dir];

	if ([[NSUserDefaults standardUserDefaults] boolForKey:@"Show Debug Messages"])
		DLog(@"Starting command `%@ %@` in dir %@", cmd, [args componentsJoinedByString:@" "], dir);
#ifdef CLI
	DLog(@"Starting command `%@ %@` in dir %@", cmd, [args componentsJoinedByString:@" "], dir);
#endif

	NSPipe* pipe = [NSPipe pipe];
	[task setStandardOutput:pipe];
	[task setStandardError:pipe];
	return task;
}

+ (NSFileHandle*) handleForCommand: (NSString*) cmd withArgs: (NSArray*) args inDir: (NSString*) dir
{
	NSTask *task = [self taskForCommand:cmd withArgs:args inDir:dir];
	NSFileHandle* handle = [[task standardOutput] fileHandleForReading];
	
	[task launch];
	return handle;
}



+ (NSString*) outputForCommand:(NSString *) cmd
					  withArgs:(NSArray *)  args
						 inDir:(NSString *) dir
				      retValue:(int *)      ret
{
	return [self outputForCommand:cmd withArgs:args inDir:dir byExtendingEnvironment:nil inputString:nil retValue:ret];
}	

+ (NSString*) outputForCommand:(NSString *) cmd
					  withArgs:(NSArray *)  args
						 inDir:(NSString *) dir
				   inputString:(NSString *) input
				      retValue:(int *)      ret
{
	return [self outputForCommand:cmd withArgs:args inDir:dir byExtendingEnvironment:nil inputString:input retValue:ret];
}

+ (NSString*) outputForCommand:(NSString *)    cmd
					  withArgs:(NSArray *)     args
						 inDir:(NSString *)    dir
		byExtendingEnvironment:(NSDictionary *)dict
				   inputString:(NSString *)    input
					  retValue:(int *)         ret
{
	NSTask *task = [self taskForCommand:cmd withArgs:args inDir:dir];

	if (dict) {
		NSMutableDictionary *env = [[[NSProcessInfo processInfo] environment] mutableCopy];
		[env addEntriesFromDictionary:dict];
		[task setEnvironment:env];
	}

	NSFileHandle* handle = [[task standardOutput] fileHandleForReading];

	if (input) {
		[task setStandardInput:[NSPipe pipe]];
		NSFileHandle *inHandle = [[task standardInput] fileHandleForWriting];
		[inHandle writeData:[input dataUsingEncoding:NSUTF8StringEncoding]];
		[inHandle closeFile];
	}
	
	[task launch];
	
	NSData* data = [handle readDataToEndOfFile];
	NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
	if (!string)
		string = [[NSString alloc] initWithData:data encoding:NSISOLatin1StringEncoding];
	
	// Strip trailing newline
	if ([string hasSuffix:@"\n"])
		string = [string substringToIndex:[string length]-1];
	
	[task waitUntilExit];
	if (ret)
		*ret = [task terminationStatus];
	return string;
}	

// We don't use the above function because then we'd have to wait until the program was finished
// with running

+ (NSString*) outputForCommand: (NSString*) cmd withArgs: (NSArray*) args  inDir: (NSString*) dir
{
	NSTask *task = [self taskForCommand:cmd withArgs:args inDir:dir];
	NSFileHandle* handle = [[task standardOutput] fileHandleForReading];
	
	[task launch];
	// This can cause a "Bad file descriptor"... when?
	NSData *data;
	@try {
		data = [handle readDataToEndOfFile];
	}
	@catch (NSException * e) {
		DLog(@"Got a bad file descriptor in %@!", NSStringFromSelector(_cmd));
		if ([NSThread currentThread] != [NSThread mainThread])
			[task waitUntilExit];

		return nil;
	}
	NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
	if (!string)
		string = [[NSString alloc] initWithData:data encoding:NSISOLatin1StringEncoding];
	
	// Strip trailing newline
	if ([string hasSuffix:@"\n"])
		string = [string substringToIndex:[string length]-1];

	if ([NSThread currentThread] != [NSThread mainThread])
		[task waitUntilExit];

	return string;
}


+ (NSString*) outputForCommand: (NSString*) cmd withArgs: (NSArray*) args
{
	return [self outputForCommand:cmd withArgs:args inDir:nil];
}

@end