From a8b53dde92c9dec0cfd74acb29b5066813827193 Mon Sep 17 00:00:00 2001
From: Jon Bergli Heier <snakebite@jvnv.net>
Date: Mon, 13 Mar 2017 19:31:15 +0100
Subject: Cleaned up lexer logic a bit.

Lexer logic now moved to get_formatted. This method raises
UnknownSyntaxError if an unknown syntax name is provided.
---
 pastepy.py | 43 ++++++++++++++++++++++---------------------
 1 file changed, 22 insertions(+), 21 deletions(-)

diff --git a/pastepy.py b/pastepy.py
index 1583bed..5d734fb 100644
--- a/pastepy.py
+++ b/pastepy.py
@@ -14,12 +14,16 @@ try:
 	has_markdown = True
 except ImportError:
 	has_markdown = False
+import pygments
 from pygments import highlight
 from pygments.lexers import get_all_lexers, get_lexer_by_name
 from pygments.formatters import HtmlFormatter
 
 base62_alphabet = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
 
+class PasteError(Exception): pass
+class UnknownSyntaxError(PasteError): pass
+
 class CustomHtmlFormatter(HtmlFormatter):
 	def wrap(self, source, outfile):
 		yield 0, '<pre>'
@@ -82,16 +86,10 @@ class Paste(object):
 			}))]
 
 	def preview(self, mp):
-		if mp['syntax'].value == 'md-render' and has_markdown:
-			text = markdown.markdown(mp['text'].value)
-			lexername = 'Rendered markdown'
-		else:
-			try:
-				lex = get_lexer_by_name(mp['syntax'].value.decode('utf8'))
-				lexername = lex.name
-				text = highlight(mp['text'].value.decode('utf8'), lex, self.formatter)
-			except:
-				return self.message('Could not find the lexer "%s".' % mp['syntax'].value, 'Error')
+		try:
+			lexername, text = self.get_formatted(mp['syntax'].value.decode('utf8'), mp['text'].value.decode('utf8'))
+		except UnknownSyntaxError:
+			return self.message('Could not find lexer "%s".' % mp['syntax'].value, 'Error')
 
 		self.start_response('200 OK', [('Content-Type', 'text/html; charset=utf-8')])
 		return [str(templates.view(searchList = {
@@ -131,17 +129,20 @@ class Paste(object):
 		self.start_response('302 Found', headers)
 		return []
 
-	def view(self):
-		def get_formatted(syntax, text):
-			if syntax == 'md-render' and has_markdown:
-				text = markdown.markdown(text)
-				lexername = 'Rendered markdown'
-			else:
+	def get_formatted(self, syntax, text):
+		if syntax == 'md-render' and has_markdown:
+			text = markdown.markdown(text)
+			lexername = 'Rendered markdown'
+		else:
+			try:
 				lex = get_lexer_by_name(syntax or 'text')
-				lexername = lex.name
-				text = highlight(text, lex, self.formatter)
-			return (lexername, text)
+			except pygments.util.ClassNotFound:
+				raise UnknownSyntaxError(syntax)
+			lexername = lex.name
+			text = highlight(text, lex, self.formatter)
+		return (lexername, text)
 
+	def view(self):
 		hash = self.path[1]
 
 		try:
@@ -156,8 +157,8 @@ class Paste(object):
 					self.start_response('404 Not Found', [])
 					return []
 				try:
-					lexername, text = get_formatted(paste.syntax, paste.text if type(paste.text) == unicode else paste.text.decode('utf8'))
-				except:
+					lexername, text = self.get_formatted(paste.syntax, paste.text if type(paste.text) == unicode else paste.text.decode('utf8'))
+				except UnknownSyntaxError:
 					return self.message('Could not find the lexer "%s".' % paste.syntax, 'Error')
 				cache = db.Cache(hash, lexername, text)
 				session.add(cache)
-- 
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