GitRevList -- Try to read the encoding of the commit message

This tries to read the encoding of the commit message, if it's specified by
git (using i18n.commitEncoding at the time of committing). It uses an ugly
hack to try to convert the encoding string to an NSStringEncoding, and then
uses that for the subject and committer name.

I'm not sure how expensive this is. If it's too expensive, we might need to
cache this value.

Author: pieter

PBGitRevList.mm

@@ -76,9 +76,9 @@ - (void) walkRevisionListWithSpecifier: (PBGitRevSpecifier*) rev
 	BOOL showSign = [rev hasLeftRight];
 
 	if (showSign)
-		arguments = [NSMutableArray arrayWithObjects:@"log", @"-z", @"--early-output", @"--topo-order", @"--pretty=format:%H\01%an\01%s\01%P\01%at\01%m", nil];
+		arguments = [NSMutableArray arrayWithObjects:@"log", @"-z", @"--early-output", @"--topo-order", @"--pretty=format:%H\01%e\01%an\01%s\01%P\01%at\01%m", nil];
 	else
-		arguments = [NSMutableArray arrayWithObjects:@"log", @"-z", @"--early-output", @"--topo-order", @"--pretty=format:%H\01%an\01%s\01%P\01%at", nil];
+		arguments = [NSMutableArray arrayWithObjects:@"log", @"-z",  @"--early-output", @"--topo-order", @"--pretty=format:%H\01%e\01%an\01%s\01%P\01%at", nil];
 
 	if (!rev)
 		[arguments addObject:@"HEAD"];
@@ -120,6 +120,12 @@ - (void) walkRevisionListWithSpecifier: (PBGitRevSpecifier*) rev
 		}
 
 		// From now on, 1.2 seconds
+		string encoding_str;
+		getline(stream, encoding_str, '\1');
+		NSStringEncoding encoding = NSUTF8StringEncoding;
+		if (encoding_str.length())
+			encoding = CFStringConvertEncodingToNSStringEncoding(CFStringConvertIANACharSetNameToEncoding((CFStringRef)[NSString stringWithUTF8String:encoding_str.c_str()]));
+
 		git_oid oid;
 		git_oid_mkstr(&oid, sha.c_str());
 		PBGitCommit* newCommit = [[PBGitCommit alloc] initWithRepository:repository andSha:oid];
@@ -152,8 +158,8 @@ - (void) walkRevisionListWithSpecifier: (PBGitRevSpecifier*) rev
 		stream >> time;
 
 
-		[newCommit setSubject:[NSString stringWithUTF8String:subject.c_str()]];
-		[newCommit setAuthor:[NSString stringWithUTF8String:author.c_str()]];
+		[newCommit setSubject:[NSString stringWithCString:subject.c_str() encoding:encoding]];
+		[newCommit setAuthor:[NSString stringWithCString:author.c_str() encoding:encoding]];
 		[newCommit setTimestamp:time];
 
 		if (showSign)