Allow preambles to omit the tikzit-specific preview stuff

The editable preambles include a bunch of things that *have* to be there
for previews to work, which makes figuring out what you can edit hard.

We now add a \documentclass automagically if it is missing, and if
\begin{document} is missing, we assume the preview-specific stuff should
be added.

OSX changes are untested.

3 files changed, 7 insertions, 4 deletions

diff --git a/tikzit/src/osx/PreambleController.h b/tikzit/src/osx/PreambleController.h
index 2d5a8ab..fca52ae 100644
--- a/tikzit/src/osx/PreambleController.h
+++ b/tikzit/src/osx/PreambleController.h
@@ -48,6 +48,7 @@
 - (void)savePreambles:(NSString*)plist;
 - (NSString*)currentPreamble;
 - (NSString*)currentPostamble;
+- (NSString*)buildDocumentForTikz:(NSString*)tikz;
 - (IBAction)setPreamble:(id)sender;
 - (IBAction)insertDefaultStyles:(id)sender;
 
diff --git a/tikzit/src/osx/PreambleController.m b/tikzit/src/osx/PreambleController.m
index e424e7b..af9a778 100644
--- a/tikzit/src/osx/PreambleController.m
+++ b/tikzit/src/osx/PreambleController.m
@@ -108,6 +108,11 @@
 	return [preambles currentPostamble];
 }
 
+- (NSString*)buildDocumentForTikz:(NSString*)tikz {
+	[self flushText];
+	return [preambles buildDocumentForTikz:tikz];
+}
+
 - (void)setSelectionIndexes:(NSIndexSet *)idx {
 	[self willChangeValueForKey:@"selectionIndexes"];
 	selectionIndexes = idx;
diff --git a/tikzit/src/osx/PreviewController.m b/tikzit/src/osx/PreviewController.m
index 7c41562..94a80a4 100644
--- a/tikzit/src/osx/PreviewController.m
+++ b/tikzit/src/osx/PreviewController.m
@@ -52,10 +52,7 @@ static PreviewController *preview = nil;
     
 	int fnum = typesetCount++;
 	
-	NSString *tex = [NSString stringWithFormat:@"%@%@%@",
-					 [preambleController currentPreamble],
-					 tikz,
-					 [preambleController currentPostamble]];
+	NSString *tex = [preambleController buildDocumentForTikz:tikz];
 	
 	NSString *texFile = [NSString stringWithFormat:@"%@/tikzit_%d.tex", tempDir, fnum];
 	NSString *pdfFile = [NSString stringWithFormat:@"%@/tikzit_%d.pdf", tempDir, fnum];