Resolve "Drop libpcre dependency"

Closes #32 (closed)

src/mkv/write.c

 #define _POSIX_C_SOURCE 200809L
 #define _DEFAULT_SOURCE
 
+#include <lektor/macro.h>
+#include <lektor/defines.h>
 #include <lektor/mkv.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -16,8 +18,6 @@
 #include <sys/types.h>
 #include <regex.h>
 
-#include <pcre.h>
-
 static const char *METADATA_TEMPLATE =
     "   <?xml version=\"1.0\" encoding=\"UTF-8\"?>  "
     "   <Tags>                                      "
@@ -141,88 +141,39 @@ error:
 static bool
 metadata_from_path(char *const mkvfile, struct kara_metadata *meta)
 {
-    pcre *regex = NULL;
-    pcre_extra *pcre_extra = NULL;
-    bool sta = false;
-    const int sub_str_vec_len = 30;
-    int pcre_error_offset, pcre_exec_ret, sub_str_vec[sub_str_vec_len], i, num;
-    char num_str[LEKTOR_TAG_MAX];
-    const char *substr;
-    char *copy_to;
+    regex_t regex;
+    const size_t nmatch = 10;
+    regmatch_t pmatch[nmatch];
+    int reti, sta = false;
+    char msgbuf[LEKTOR_TAG_MAX];
 
     static const char *rgx =
         "^\\/(?:.+)\\/(vo|va|amv|cdg|autres|vocaloid)\\/"
         "(jp|fr|en|ru|sp|it|ch|latin|multi|undefined)\\/(.+)\\/"
         "(.+) - (OP|ED|IS|AMV|VOCA|PV|MV|LIVE)(\\d*) - (.+)\\.mkv$";
-    const char *pcre_error_str = NULL;
-
-    if ((regex = pcre_compile(rgx, 0, &pcre_error_str, &pcre_error_offset, NULL)) == NULL) {
-        fprintf(stderr, " ! metadata_from_path: failed to compile regex\n");
-        return false;
-    }
 
-    pcre_extra = pcre_study(regex, 0, &pcre_error_str);
-
-    if (pcre_error_str != NULL) {
-        fprintf(stderr, " ! metadata_from_path: failed to study regex: %s\n", pcre_error_str);
-        goto error;
-    }
+    RETURN_IF(regcomp(&regex, rgx, REG_EXTENDED), "Failed to compile regex", false);
 
     memset(meta, 0, sizeof(struct kara_metadata));
-    memset(num_str, 0, LEKTOR_TAG_MAX * sizeof(char));
-    pcre_exec_ret = pcre_exec(regex, pcre_extra, mkvfile, strlen(mkvfile), 0, 0,
-                              sub_str_vec, sub_str_vec_len);
+    memset(msgbuf, 0, LEKTOR_TAG_MAX * sizeof(char));
 
-    if (pcre_exec_ret < 0) {
-        fprintf(stderr, " ! metadata_from_path: PCRE error\n");
-        goto error;
-    }
+    reti = regexec(&regex, mkvfile, nmatch, pmatch, 0);
 
-    if (pcre_exec_ret == 0) {
-        // To much -> error in our case //
-        fprintf(stderr, " ! metadata_from_path: To much matches found for file: %s\n", mkvfile);
+    if (!reti) {
+        /* Match */
+        exit(100);
+    } else if (REG_NOMATCH == reti) {
+        fprintf(stderr, "No match for: %s\n", mkvfile);
+        goto error;
+    } else {
+        regerror(reti, &regex, msgbuf, sizeof(msgbuf));
+        fprintf(stderr, "Failed to execute regex: %s\n", msgbuf);
         goto error;
     }
 
-    for (i = 1; i < pcre_exec_ret; ++i) {
-        pcre_get_substring(mkvfile, sub_str_vec, pcre_exec_ret, i, &substr);
-
-        if (i == 1)
-            copy_to = meta->song_type;
-        else if (i == 2)
-            copy_to = meta->language;
-        else if (i == 3)
-            copy_to = meta->author_name;
-        else if (i == 4)
-            copy_to = meta->source_name;
-        else if (i == 5)
-            copy_to = meta->category;
-        else if (i == 6)
-            copy_to = num_str;
-        else if (i == 7)
-            copy_to = meta->song_name;
-        else {
-            pcre_free_substring(substr);
-            goto error;
-        }
-
-        snprintf(copy_to, LEKTOR_TAG_MAX, "%s", substr);
-        pcre_free_substring(substr);
-    }
-
-    meta->song_number = ((num = atoi(num_str)) <= 0) ? 1 : num;
     sta = true;
 error:
-    pcre_free(regex);
-
-    if (pcre_extra != NULL) {
-#ifdef PCRE_CONFIG_JIT
-        pcre_free_study(pcre_extra);
-#else
-        pcre_free(pcre_extra);
-#endif
-    }
-
+    regfree(&regex);
     return sta;
 }