NSError+Git.m

//
//  NSError+Git.m
//  ObjectiveGitFramework
//
//  Created by Timothy Clem on 2/17/11.
//
//  The MIT License
//
//  Copyright (c) 2011 Tim Clem
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

#import "NSError+Git.h"
#import "git2/errors.h"

NSString * const GTGitErrorDomain = @"GTGitErrorDomain";
NSString * const GTGitErrorOID = @"GTOID";

@implementation NSError (Git)

+ (NSError *)git_errorFor:(int)code description:(NSString *)desc, ... {
	NSString *formattedDesc = nil;
	if (desc != nil) {
		va_list args;
		va_start(args, desc);

		formattedDesc = [[NSString alloc] initWithFormat:desc arguments:args];
		va_end(args);
	}

	return [self git_errorFor:code description:formattedDesc failureReason:nil];
}

+ (NSError *)git_errorFor:(int)code description:(NSString *)desc failureReason:(NSString *)reason, ... {
	NSMutableDictionary *userInfo = [NSMutableDictionary dictionary];

	if (desc != nil) userInfo[NSLocalizedDescriptionKey] = desc;
	if (reason != nil) {
		va_list args;
		va_start(args, reason);

		NSString *formattedReason = [[NSString alloc] initWithFormat:reason arguments:args];
		va_end(args);

		userInfo[NSLocalizedFailureReasonErrorKey] = formattedReason;
	}

	NSError *underError = [self git_errorFor:code];
	if (underError != nil) {
		userInfo[NSUnderlyingErrorKey] = underError;
		userInfo[NSLocalizedRecoverySuggestionErrorKey] = [underError localizedDescription];
	}

	return [NSError errorWithDomain:GTGitErrorDomain code:code userInfo:userInfo];
}

+ (NSError *)git_errorFor:(int)code description:(NSString *)desc userInfo:(NSDictionary *)additionalUserInfo failureReason:(NSString *)reason, ... {
	NSMutableDictionary *userInfo = [NSMutableDictionary dictionaryWithDictionary:additionalUserInfo];

	if (desc != nil) userInfo[NSLocalizedDescriptionKey] = desc;
	if (reason != nil) {
		va_list args;
		va_start(args, reason);

		NSString *formattedReason = [[NSString alloc] initWithFormat:reason arguments:args];
		va_end(args);

		userInfo[NSLocalizedFailureReasonErrorKey] = formattedReason;
	}

	NSError *underError = [self git_errorFor:code];
	if (underError != nil) userInfo[NSUnderlyingErrorKey] = underError;

	return [NSError errorWithDomain:GTGitErrorDomain code:code userInfo:userInfo];
}

+ (NSError *)git_errorFor:(int)code {
	NSDictionary *userInfo = nil;

	NSString *description = [self git_descriptionForErrorCode:code];
	if (description != nil) userInfo = @{ NSLocalizedDescriptionKey: description };

	return [NSError errorWithDomain:GTGitErrorDomain code:code userInfo:userInfo];
}

+ (NSString *)git_descriptionForErrorCode:(int)code {
	const git_error *gitLastError = giterr_last();
	if (gitLastError != NULL) {
		return @(gitLastError->message);
	} else if (code == GITERR_OS) {
		return @(strerror(errno));
	} else {
		return nil;
	}
}

@end