Merge pull request rxi#70 from lite-xl/improve-tex-syntax

Attempt to improve tex syntax highlighting

Author: franko

plugins/language_tex.lua

@@ -5,13 +5,22 @@ syntax.add {
   files = { "%.tex$" },
   comment = "%%",
   patterns = {
-    { pattern = {"%%", "\n"},     type = "comment"  },
-    { pattern = "&",              type = "operator" },
-    { pattern = "\\\\",           type = "operator" },
-    { pattern = {"%$", "%$"},     type = "operator" },
-    { pattern = {"\\%[", "\\]"},  type = "operator" },
-    { pattern = {"{", "}"},       type = "keyword"  },
-    { pattern = "\\%w*",          type = "keyword2" },
+    { pattern = "%%.-\n",                  type = "comment"  },
+    { pattern = "\\documentclass().-{()%a%w+()}",  type = {"keyword", "symbol", "function", "symbol"} },
+    { pattern = "\\usepackage",            type = "keyword"  },
+    { pattern = "\\chapter",               type = "keyword"  },
+    { pattern = "\\section",               type = "keyword"  },
+    { pattern = "\\subsection",            type = "keyword"  },
+    { pattern = "\\paragraph",             type = "keyword"  },
+    { pattern = "\\subparagraph",          type = "keyword"  },
+    { pattern = "\\begin(){()%a%w+()}",    type = {"keyword2", "symbol", "function", "symbol"} },
+    { pattern = "\\end(){()%a%w+()}",      type = {"keyword2", "symbol", "function", "symbol"} },
+    { pattern = "\\%a%w+()%*",             type = {"keyword2", "operator"} },
+    { pattern = "\\%a%w+",                 type = "keyword2"  },
+    { pattern = "&",                       type = "operator"  },
+    { pattern = "\\\\",                    type = "operator"  },
+    { pattern = "%$",                      type = "operator"   },
+    { pattern = "\\[%[%]()]",              type = "operator"   },
   },
   symbols = {}
 }