Cleanup NONE/AUTO filetype definitions

At the moment the Geany code uses arbitrary combination of the following
synonyms

TM_PARSER_NONE / LANG_IGNORE / -2
TM_PARSER_AUTO / LANG_AUTO / -1

Especially using just the numbers makes things very confusing.

In the Geany code this patch replaces all occurrences of -2 and LANG_IGNORE
with TM_PARSER_NONE. It also removes LANG_IGNORE from the header which
isn't needed any more.

In addition, TM_PARSER_AUTO/LANG_AUTO shouldn't be used at all. We want
filetype detection based on Geany's definitions and not based on the
hard-coded ctags definitions. Remove it completely.

Finally, as it's clearer now what the constants mean, the patch fixes the
implementation of langs_compatible() (tag or file can never be of type
AUTO but we should rather check for NONE filetypes which we should
consider incompatible between each other).

src/filetypes.c

@@ -202,7 +202,7 @@ static GeanyFiletype *filetype_new(void)
 	GeanyFiletype *ft = g_new0(GeanyFiletype, 1);
 
 	ft->group = GEANY_FILETYPE_GROUP_NONE;
-	ft->lang = -2;	/* assume no tagmanager parser */
+	ft->lang = TM_PARSER_NONE;	/* assume no tagmanager parser */
 	/* pattern must not be null */
 	ft->pattern = g_new0(gchar*, 1);
 	ft->indent_width = -1;

src/symbols.c

@@ -295,8 +295,8 @@ GString *symbols_find_typenames_as_string(gint lang, gboolean global)
 
 			/* the check for tag_lang == lang is necessary to avoid wrong type colouring of
 			 * e.g. PHP classes in C++ files
-			 * lang = -2 disables the check */
-			if (tag->name && (tag_lang == lang || lang == -2 ||
+			 * lang = TM_PARSER_NONE disables the check */
+			if (tag->name && (tag_lang == lang || lang == TM_PARSER_NONE ||
 				(lang == TM_PARSER_CPP && tag_lang == TM_PARSER_C)))
 			{
 				if (j != 0)

tagmanager/src/tm_parser.h

@@ -10,18 +10,11 @@
 #ifndef TM_PARSER_H
 #define TM_PARSER_H
 
-#ifndef LIBCTAGS_DEFINED
-/* from ctags/parse.h */
-#	define LANG_AUTO   (-1)
-#	define LANG_IGNORE (-2)
-#endif
-
 
 /* keep in sync with ctags/parsers.h */
 typedef enum
 {
-	TM_PARSER_NONE = LANG_IGNORE,
-	TM_PARSER_AUTO = LANG_AUTO,
+	TM_PARSER_NONE = -2, /* keep in sync with ctags LANG_IGNORE */
 	TM_PARSER_C = 0,
 	TM_PARSER_CPP,
 	TM_PARSER_JAVA,

tagmanager/src/tm_source_file.c

@@ -34,6 +34,7 @@
 #define LIBCTAGS_DEFINED
 #include "tm_source_file.h"
 #include "tm_tag.h"
+#include "tm_parser.h"
 
 typedef struct
 {
@@ -193,7 +194,7 @@ static gboolean tm_source_file_init(TMSourceFile *source_file, const char *file_
 	}
 
 	if (name == NULL)
-		source_file->lang = LANG_AUTO;
+		source_file->lang = TM_PARSER_NONE;
 	else
 		source_file->lang = getNamedLanguage(name);
 
@@ -203,7 +204,7 @@ static gboolean tm_source_file_init(TMSourceFile *source_file, const char *file_
 /** Initializes a TMSourceFile structure and returns a pointer to it. The
  * TMSourceFile has to be added to TMWorkspace to start its parsing.
  * @param file_name The file name.
- * @param name Name of the used programming language, NULL for autodetection.
+ * @param name Name of the used programming language, NULL to disable parsing.
  * @return The created unparsed TMSourceFile object.
  * */
 GEANY_API_SYMBOL
@@ -297,7 +298,7 @@ gboolean tm_source_file_parse(TMSourceFile *source_file, guchar* text_buf, gsize
 		return FALSE;
 	}
 
-	if (source_file->lang == LANG_IGNORE)
+	if (source_file->lang == TM_PARSER_NONE)
 	{
 		tm_tags_array_free(source_file->tags_array, FALSE);
 		return FALSE;
@@ -342,15 +343,7 @@ gboolean tm_source_file_parse(TMSourceFile *source_file, guchar* text_buf, gsize
 			TagEntrySetArglistFunction = tm_source_file_set_tag_arglist;
 	}
 	current_source_file = source_file;
-	if (LANG_AUTO == source_file->lang)
-		source_file->lang = getFileLanguage (file_name);
-	if (source_file->lang == LANG_IGNORE)
-	{
-#ifdef TM_DEBUG
-		g_warning("ignoring %s (unknown language)\n", file_name);
-#endif
-	}
-	else if (! LanguageTable [source_file->lang]->enabled)
+	if (! LanguageTable [source_file->lang]->enabled)
 	{
 #ifdef TM_DEBUG
 		g_warning("ignoring %s (language disabled)\n", file_name);
@@ -422,7 +415,7 @@ const gchar *tm_source_file_get_lang_name(gint lang)
 
 /* Gets the language index for \a name.
  @param name The language name.
- @return The language index, or -2.
+ @return The language index, or TM_PARSER_NONE.
 */
 gint tm_source_file_get_named_lang(const gchar *name)
 {

tagmanager/src/tm_workspace.c

@@ -193,8 +193,7 @@ void tm_workspace_add_source_file_noupdate(TMSourceFile *source_file)
  you're editing. It's useful for a "real-time" updating of the tags.
  The tags array and the tags themselves are destroyed and re-created, hence any
  other tag arrays pointing to these tags should be rebuilt as well. All sorting
- information is also lost. The language parameter is automatically detected 
- the first time the file is parsed if it is set to LANG_AUTO.
+ information is also lost.
  @param source_file The source file to update with a buffer.
  @param text_buf A text buffer. The user should take care of allocate and free it after
  the use here.
@@ -688,7 +687,9 @@ gboolean tm_workspace_create_global_tags(const char *pre_process, const char **i
 
 static gboolean langs_compatible(langType lang, langType other)
 {
-	if (lang == other || lang == -1 || other == -1)
+	if (lang == TM_PARSER_NONE || other == TM_PARSER_NONE)
+		return FALSE;
+	if (lang == other)
 		return TRUE;
 	/* Accept CPP tags for C lang and vice versa */
 	else if (lang == TM_PARSER_C && other == TM_PARSER_CPP)