From dd09a5cabc31d985becc98167722d49077832a8e Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Sat, 20 Jun 2015 21:58:19 +0200
Subject: [PATCH] Use the draft option for microtype

Instead of redefining \usepackage for avoiding the microtype package
when generating previews in dvi mode, the draft option can be used
for disabling it. This also allows to somewhat simplify the
fix_latex_file function.
---
 lib/scripts/lyxpreview2bitmap.py | 68 ++++++++++----------------------
 1 file changed, 21 insertions(+), 47 deletions(-)

diff --git a/lib/scripts/lyxpreview2bitmap.py b/lib/scripts/lyxpreview2bitmap.py
index c2b94d4ed5..9775b0e1d1 100755
--- a/lib/scripts/lyxpreview2bitmap.py
+++ b/lib/scripts/lyxpreview2bitmap.py
@@ -160,59 +160,33 @@ def extract_metrics_info(dvipng_stdout):
 
 def fix_latex_file(latex_file, pdf_output):
     documentclass_re = re.compile("(\\\\documentclass\[)(1[012]pt,?)(.+)")
-    def_re = re.compile(r"(\\newcommandx|\\global\\long\\def)(\\[a-zA-Z]+)(.+)")
-    usepackage_re = re.compile("\\\\usepackage")
-    userpreamble_re = re.compile("User specified LaTeX commands")
-    enduserpreamble_re = re.compile("\\\\makeatother")
+    def_re = re.compile(r"(\\newcommandx|\\global\\long\\def)(\\[a-zA-Z]+)")
 
     tmp = mkstemp()
 
-    in_user_preamble = 0
-    usepkg = 0
-    changed = 0
+    changed = False
     macros = []
     for line in open(latex_file, 'r').readlines():
-        match = documentclass_re.match(line)
-        if match != None:
-            changed = 1
-            tmp.write("%s%s\n" % (match.group(1), match.group(3)))
-            continue
-
-        if not pdf_output and not usepkg:
-            if userpreamble_re.search(line) != None:
-                in_user_preamble = 1
-            elif enduserpreamble_re.search(line) != None:
-                in_user_preamble = 0
-            if usepackage_re.match(line) != None and in_user_preamble:
-                usepkg = 1
-                changed = 1
-                tmp.write("\\def\\t@a{microtype}\n")
-                tmp.write("\\let\\oldusepkg\\usepackage\n")
-                tmp.write("\\def\\usepackage{\\@ifnextchar[\\@usepkg{\\@usepkg[]}}\n")
-                tmp.write("\\def\\@usepkg[#1]#2{\\@ifnextchar[")
-                tmp.write("{\\@@usepkg[#1]{#2}}{\\@@usepkg[#1]{#2}[]}}\n")
-                tmp.write("\\def\@@usepkg[#1]#2[#3]{\\def\\t@b{#2}")
-                tmp.write("\\ifx\\t@a\\t@b\\else\\oldusepkg[#1]{#2}[#3]\\fi}\n")
-                tmp.write(line)
-                continue
-
-        match = def_re.match(line)
-        if match == None:
-            tmp.write(line)
-            continue
-
-        macroname = match.group(2)
-        if not macroname in macros:
-            macros.append(macroname)
-            tmp.write(line)
-            continue
-
-        definecmd = match.group(1)
-        if definecmd == "\\global\\long\\def":
-            tmp.write(line)
+        if line.startswith("\\documentclass"):
+            match = documentclass_re.match(line)
+            if match != None:
+                changed = True
+                line = match.group(1) + match.group(3) + "\n"
+            if not pdf_output:
+                changed = True
+                line += "\\PassOptionsToPackage{draft}{microtype}\n"
         else:
-            changed = 1
-            tmp.write("\\renewcommandx%s%s\n" % (match.group(2), match.group(3)))
+            match = def_re.match(line)
+            if match != None:
+                macroname = match.group(2)
+                if macroname in macros:
+                    definecmd = match.group(1)
+                    if definecmd == "\\newcommandx":
+                        changed = True
+                        line = line.replace(definecmd, "\\renewcommandx")
+                else:
+                    macros.append(macroname)
+        tmp.write(line)
 
     if changed:
         copyfileobj(tmp, open(latex_file,"wb"), 1)