add an external code block formatter to the markdown program

main.c

@@ -76,11 +76,11 @@ anchor_format(char *input, void *ctx)
 
      if ( !ret )
 	 return NULL;
-     
+
 
     while ( size && isspace(input[size-1]) )
 	--size;
-    
+
     for ( j=i=0; i < size; i++ ) {
 	if (isalnum(input[i]) || strchr("-_+", input[i]) )
 	    ret[j++] = input[i];
@@ -88,7 +88,7 @@ anchor_format(char *input, void *ctx)
 	    ret[j++] = '-';
     }
     ret[j++] = 0;
-    
+
     return ret;
 }
 
@@ -99,6 +99,49 @@ free_it(char *object, void *ctx)
 	free(object);
 }
 
+char *
+external_codefmt(char *src, int len, char *lang)
+{
+    int extra = 0;
+    int i, x;
+    char *res;
+
+    if ( lang == 0 )
+	lang = "generic_code";
+
+    for ( i=0; i < len; i++) {
+	if ( src[i] == '&' )
+	    extra += 5;
+	else if ( src[i] == '<' || src[i] == '>' )
+	    extra += 4;
+    }
+
+    /* 80 characters for the format wrappers */
+    if ( (res = malloc(len+extra+80+strlen(lang))) ==0 )
+	/* out of memory?  drat! */
+	return 0;
+
+    sprintf(res, "<pre><code class=\"%s\">\n", lang);
+    x = strlen(res);
+    for ( i=0; i < len; i++ ) {
+	switch (src[i]) {
+	case '&':   strcpy(&src[x], "&amp;");
+		    x += 5 /*strlen(&amp;)*/ ;
+		    break;
+	case '<':   strcpy(&src[x], "&lt;");
+		    x += 4 /*strlen(&lt;)*/ ;
+		    break;
+	case '>':   strcpy(&src[x], "&gt;");
+		    x += 4 /*strlen(&gt;)*/ ;
+		    break;
+	default:    res[x++] = src[i];
+		    break;
+	}
+    }
+    strcpy(&res[x], "</code></pre>\n");
+    return res;
+}
+
 
 struct h_opt opts[] = {
     { 0, "html5",  '5', 0,           "recognise html5 block elements" },
@@ -115,8 +158,9 @@ struct h_opt opts[] = {
     { 0, 0,        't', "text",      "format `text` with mkd_line()" },
     { 0, "toc",    'T', 0,           "output a TOC" },
     { 0, 0,        'C', "prefix",    "prefix for markdown extra footnotes" },
-    { 0, 0,        'o', "file",       "write output to file" },
+    { 0, 0,        'o', "file",      "write output to file" },
     { 0, "squash", 'x', 0,           "squash toc labels to be more like github" },
+    { 0, "codefmt",'X', 0,           "use an external code formatter" },
 };
 #define NROPTS (sizeof opts/sizeof opts[0])
 
@@ -132,6 +176,7 @@ main(int argc, char **argv)
     int with_html5 = 0;
     int styles = 0;
     int use_mkd_line = 0;
+    int use_e_codefmt = 0;
     int github_flavoured = 0;
     int squash = 0;
     char *extra_footnote_prefix = 0;
@@ -209,6 +254,9 @@ main(int argc, char **argv)
 		    break;
 	case 'x':   squash = 1;
 		    break;
+	case 'X':   use_e_codefmt = 1;
+		    set_flag(&flags, "fencedcode");
+		    break;
 	}
     }
 
@@ -257,10 +305,14 @@ main(int argc, char **argv)
 	    mkd_e_data(doc, urlflags);
 	    mkd_e_flags(doc, e_flags);
 	}
-	if ( squash ) {
+	if ( squash )
 	    mkd_e_anchor(doc, (mkd_callback_t) anchor_format);
+	if ( use_e_codefmt )
+	    mkd_e_code_format(doc, external_codefmt);
+
+	if ( use_e_codefmt || squash )
 	    mkd_e_free(doc, free_it);
-	}
+
 	if ( extra_footnote_prefix )
 	    mkd_ref_prefix(doc, extra_footnote_prefix);
 

mkdio.h.in

@@ -68,7 +68,7 @@ typedef void   (*mkd_free_t)(char*, void*);
 void mkd_e_url(void *, mkd_callback_t);
 void mkd_e_flags(void *, mkd_callback_t);
 void mkd_e_anchor(void *, mkd_callback_t);
-void mkd_e_codefmt(void*, mkd_callback_t);
+void mkd_e_code_format(void*, mkd_callback_t);
 void mkd_e_free(void *, mkd_free_t );
 void mkd_e_data(void *, void *);