langmoderegex.patch

   1 From: Arne Foerlie <arne@forlie.com>
   2 Subject: regex to detect language mode
   3
   4 The following patch extends the language mode detection mechanism to allow
   5 use of regular expressions. It provides backward compatibility with the old
   6 format by requiring that the regex is enclosed in single quotes.
   7
   8 E.g.:
   9
  10   .mk '[m|M]akefile*'
  11
  12 will match common ways of naming make files.
  13
  14 ---
  15
  16  source/preferences.c |   64 +++++++++++++++++++++++++++++++--------------------
  17  1 file changed, 39 insertions(+), 25 deletions(-)
  18
  19 diff --quilt old/source/preferences.c new/source/preferences.c
  20 --- old/source/preferences.c
  21 +++ new/source/preferences.c
  22 @@ -3217,7 +3217,9 @@ the list on the left.  To add a new lang
  23
  24      extLbl = XtVaCreateManagedWidget("extLbl", xmLabelGadgetClass, form,
  25             XmNlabelString,
  26 -               s1=XmStringCreateSimple("File extensions (separate w/ space)"),
  27 +               s1=MKSTRING(
  28 +"File extensions or regexes (in single quotes)\n\
  29 +(separate w/ space)"),
  30             XmNmnemonic, 'F',
  31             XmNalignment, XmALIGNMENT_BEGINNING,
  32             XmNleftAttachment, XmATTACH_POSITION,
  33 @@ -4817,47 +4819,59 @@ static int matchLanguageMode(WindowInfo
  34
  35      /*... look for an explicit mode statement first */
  36
  37 -    /* Do a regular expression search on for recognition pattern */
  38 -    first200 = BufGetRange(window->buffer, 0, 200);
  39 -    for (i=0; i<NLanguageModes; i++) {
  40 -       if (LanguageModes[i]->recognitionExpr != NULL) {
  41 -           if (SearchString(first200, LanguageModes[i]->recognitionExpr,
  42 -                   SEARCH_FORWARD, SEARCH_REGEX, False, 0, &beginPos,
  43 -                   &endPos, NULL, NULL, NULL))
  44 -            {
  45 -               XtFree(first200);
  46 -               return i;
  47 -           }
  48 -       }
  49 -    }
  50 -    XtFree(first200);
  51 -
  52      /* Look at file extension ("@@/" starts a ClearCase version extended path,
  53         which gets appended after the file extension, and therefore must be
  54         stripped off to recognize the extension to make ClearCase users happy) */
  55      fileNameLen = strlen(window->filename);
  56  #ifdef VMS
  57      if (strchr(window->filename, ';') != NULL)
  58 -       fileNameLen = strchr(window->filename, ';') - window->filename;
  59 +        fileNameLen = strchr(window->filename, ';') - window->filename;
  60  #else
  61      if ((versionExtendedPath = GetClearCaseVersionExtendedPath(window->filename)) != NULL)
  62          fileNameLen = versionExtendedPath - window->filename;
  63  #endif
  64      for (i=0; i<NLanguageModes; i++) {
  65 -       for (j=0; j<LanguageModes[i]->nExtensions; j++) {
  66 -           ext = LanguageModes[i]->extensions[j];
  67 -           extLen = strlen(ext);
  68 -           start = fileNameLen - extLen;
  69 -#if defined(__VMS) && (__VMS_VER >= 70200000)
  70 -          /* VMS v7.2 has case-preserving filenames */
  71 +        for (j=0; j<LanguageModes[i]->nExtensions; j++) {
  72 +            ext = LanguageModes[i]->extensions[j];
  73 +            extLen = strlen(ext);
  74 +            if (ext[0] == '\'' && ext[extLen - 1] == '\'') {
  75 +                char* regex = XtMalloc(extLen);
  76 +                /* copy everything except the single quotes into regex */
  77 +                strcpy(regex, &ext[1]);
  78 +                regex[extLen - 2] = '\0';
  79 +                if (regexFind(window->filename, regex)) {
  80 +                    XtFree(regex);
  81 +                    return i;
  82 +                } else {
  83 +                    XtFree(regex);
  84 +                }
  85 +            } else {
  86 +                start = fileNameLen - extLen;
  87 +#if defined(__VMS) && (__VMS_VER >= 70200000)
  88 +            /* VMS v7.2 has case-preserving filenames */
  89              if (start >= 0 && !strncasecmp(&window->filename[start], ext, extLen))
  90                 return i;
  91  #else
  92 -            if (start >= 0 && !strncmp(&window->filename[start], ext, extLen))
  93 +            if (start >= 0 && !strncmp(&window->filename[start], ext, extLen))
  94                  return i;
  95  #endif
  96 -       }
  97 +            }
  98 +        }
  99 +    }
 100 +
 101 +    /* Do a regular expression search on for recognition pattern */
 102 +    first200 = BufGetRange(window->buffer, 0, 200);
 103 +    for (i=0; i<NLanguageModes; i++) {
 104 +        if (LanguageModes[i]->recognitionExpr != NULL) {
 105 +            if (SearchString(first200, LanguageModes[i]->recognitionExpr,
 106 +                             SEARCH_FORWARD, SEARCH_REGEX, False, 0, &beginPos,
 107 +                             &endPos, NULL, NULL, NULL)) {
 108 +                XtFree(first200);
 109 +                return i;
 110 +           }
 111 +        }
 112      }
 113 +    XtFree(first200);
 114
 115      /* no appropriate mode was found */
 116      return PLAIN_LANGUAGE_MODE;