Add query component to scm URL

Previously when constructing a scm URL from a path, if scm was not enabled
we returned a file URL. This could result in some unexpected behavior.
For instance, when a directory was selected in the file browser,
activating "SCM Status" would just open the untracked directory.
This patch, insteads, adds a query to the scm URL that can be parsed to
determine how to handle the scm status request later on.

Frameworks/OakFileBrowser/src/io/FSSCMDataSource.mm

@@ -78,7 +78,13 @@ _Iter prune_path_children (_Iter it, _Iter last)
 	std::string root = scm::root_for_path([aPath fileSystemRepresentation]);
 	if(root != NULL_STR)
 		return [NSURL URLWithString:[NSString stringWithCxxString:"scm://localhost" + encode::url_part(root, "/") + "/"]];
-	return [NSURL fileURLWithPath:aPath];
+	return [NSURL URLWithString:[@"scm://locahost" stringByAppendingString:[aPath stringByAppendingString:@"?status=unversioned"]]];
+}
+
++ (NSString*)parseSCMURLStatusQuery:(NSURL*)anURL
+{
+	NSArray* query = [[anURL query] componentsSeparatedByString:@"="];
+	return [query lastObject] ?: @"all";
 }
 
 - (NSArray*)repositoryStatus
@@ -104,13 +110,13 @@ _Iter prune_path_children (_Iter it, _Iter last)
 	std::sort(unstagedPaths.begin(), unstagedPaths.end(), text::less_t());
 	std::sort(untrackedPaths.begin(), untrackedPaths.end(), text::less_t());
 
-	FSItem* unstagedItem  = [FSItem itemWithURL:URLAppend(self.rootItem.url, @".unstaged/")];
+	FSItem* unstagedItem  = [FSItem itemWithURL:URLAppend(self.rootItem.url, @"?status=unstaged")];
 	unstagedItem.icon     = SCMFolderIcon();
 	unstagedItem.name     = @"Uncommitted Changes";
 	unstagedItem.group    = YES;
 	unstagedItem.children = convert(unstagedPaths, scmInfo->root_path(), options);
 
-	FSItem* untrackedItem  = [FSItem itemWithURL:URLAppend(self.rootItem.url, @".untracked/")];
+	FSItem* untrackedItem  = [FSItem itemWithURL:URLAppend(self.rootItem.url, @"?status=untracked")];
 	untrackedItem.icon     = SCMFolderIcon();
 	untrackedItem.name     = @"Untracked Items";
 	untrackedItem.group    = YES;
@@ -134,9 +140,21 @@ _Iter prune_path_children (_Iter it, _Iter last)
 		options = someOptions;
 
 		std::string const rootPath = [[anURL path] fileSystemRepresentation];
+		std::string name = path::display_name(rootPath);
+
+		NSString* status = [FSSCMDataSource parseSCMURLStatusQuery:anURL];
+		if([status isEqualToString:@"unversioned"])
+		{
+			self.rootItem          = [FSItem itemWithURL:nil];
+			self.rootItem.icon     = [NSImage imageNamed:NSImageNameFolderSmart];
+			self.rootItem.name     = [NSString stringWithCxxString:text::format("%s (%s)", name.c_str(), "Unversioned")];
+			self.rootItem.children = nil;
+
+			return self;
+		}
+
 		if(scmInfo = scm::info(rootPath))
 		{
-			std::string name = path::display_name(rootPath);
 			if(!scmInfo->dry())
 			{
 				auto const& vars = scmInfo->scm_variables();
@@ -145,10 +163,27 @@ _Iter prune_path_children (_Iter it, _Iter last)
 					name = text::format("%s (%s)", path::display_name(scmInfo->root_path()).c_str(), branch->second.c_str());
 			}
 
-			self.rootItem          = [FSItem itemWithURL:anURL];
+			if([status isEqualToString:@"all"])
-			self.rootItem.icon     = [NSImage imageNamed:NSImageNameFolderSmart];
+			{
-			self.rootItem.name     = [NSString stringWithCxxString:name];
+				self.rootItem          = [FSItem itemWithURL:anURL];
-			self.rootItem.children = [self repositoryStatus];
+				self.rootItem.icon     = [NSImage imageNamed:NSImageNameFolderSmart];
+				self.rootItem.name     = [NSString stringWithCxxString:name];
+				self.rootItem.children = [self repositoryStatus];
+			}
+			else
+			{
+				name = path::display_name(rootPath);
+				for(FSItem* item in [self repositoryStatus])
+				{
+					if([[FSSCMDataSource parseSCMURLStatusQuery:item.url] isEqualToString:status])
+					{
+						self.rootItem          = [FSItem itemWithURL:anURL];
+						self.rootItem.icon     = [NSImage imageNamed:NSImageNameFolderSmart];
+						self.rootItem.name     = [NSString stringWithFormat:@"%@ (%@)", [NSString stringWithCxxString:name], item.name];
+						self.rootItem.children = item.children;
+					}
+				}
+			}
 
 			__weak FSSCMDataSource* weakSelf = self;
 			scmInfo->add_callback(^(scm::info_t const&){
@@ -161,6 +196,6 @@ _Iter prune_path_children (_Iter it, _Iter last)
 
 - (NSArray*)expandedURLs
 {
-	return @[ URLAppend(self.rootItem.url, @".unstaged/"), URLAppend(self.rootItem.url, @".untracked/") ];
+	return @[ URLAppend(self.rootItem.url, @"?status=unstaged"), URLAppend(self.rootItem.url, @"?status=untracked") ];
 }
 @end