From fe54a6725ede65020dc8fb71e8d453c1c51dc3fe Mon Sep 17 00:00:00 2001
From: Scott Anderson <ascent12@hotmail.com>
Date: Fri, 7 Apr 2017 00:16:06 +1200
Subject: [PATCH] Changed regular expressions to use PCRE for i3 compatibility

---
 sway/criteria.c | 40 +++++++++++++++++-----------------------
 1 file changed, 17 insertions(+), 23 deletions(-)

diff --git a/sway/criteria.c b/sway/criteria.c
index bd99461d..706da04f 100644
--- a/sway/criteria.c
+++ b/sway/criteria.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdbool.h>
-#include <regex.h>
+#include <pcre.h>
 #include "sway/criteria.h"
 #include "sway/container.h"
 #include "sway/config.h"
@@ -42,18 +42,13 @@ static const char * const criteria_strings[] = {
  */
 struct crit_token {
 	enum criteria_type type;
-	regex_t *regex;
+	pcre *regex;
 	char *raw;
 };
 
 static void free_crit_token(struct crit_token *crit) {
-	if (crit->regex) {
-		regfree(crit->regex);
-		free(crit->regex);
-	}
-	if (crit->raw) {
-		free(crit->raw);
-	}
+	pcre_free(crit->regex);
+	free(crit->raw);
 	free(crit);
 }
 
@@ -190,18 +185,17 @@ static char *parse_criteria_name(enum criteria_type *type, char *name) {
 }
 
 // Returns error string on failure or NULL otherwise.
-static char *generate_regex(regex_t **regex, char *value) {
-	*regex = calloc(1, sizeof(regex_t));
-	int err = regcomp(*regex, value, REG_NOSUB);
-	if (err != 0) {
-		char *reg_err = malloc(64);
-		regerror(err, *regex, reg_err, 64);
+static char *generate_regex(pcre **regex, char *value) {
+	const char *reg_err;
+	int offset;
+
+	*regex = pcre_compile(value, PCRE_UTF8 | PCRE_UCP, &reg_err, &offset, NULL);
 
+	if (!*regex) {
 		const char *fmt = "Regex compilation (for '%s') failed: %s";
 		int len = strlen(fmt) + strlen(value) + strlen(reg_err) - 3;
 		char *error = malloc(len);
 		snprintf(error, len, fmt, value, reg_err);
-		free(reg_err);
 		return error;
 	}
 	return NULL;
@@ -245,8 +239,8 @@ ect_cleanup:
 	return error;
 }
 
-static int regex_cmp(const char *item, const regex_t *regex) {
-    return regexec(regex, item, 0, NULL, 0);
+static int regex_cmp(const char *item, const pcre *regex) {
+    return pcre_exec(regex, NULL, item, strlen(item), 0, 0, NULL, 0);
 }
 
 // test a single view if it matches list of criteria tokens (all of them).
@@ -266,7 +260,7 @@ static bool criteria_test(swayc_t *cont, list_t *tokens) {
 				if (focused->class && strcmp(cont->class, focused->class) == 0) {
 					matches++;
 				}
-			} else if (crit->regex && regexec(crit->regex, cont->class, 0, NULL, 0) == 0) {
+			} else if (crit->regex && regex_cmp(cont->class, crit->regex) == 0) {
 				matches++;
 			}
 			break;
@@ -281,7 +275,7 @@ static bool criteria_test(swayc_t *cont, list_t *tokens) {
 		case CRIT_ID:
 			if (!cont->app_id) {
 				// ignore
-			} else if (crit->regex && regexec(crit->regex, cont->app_id, 0, NULL, 0) == 0) {
+			} else if (crit->regex && regex_cmp(cont->app_id, crit->regex) == 0) {
 				matches++;
 			}
 			break;
@@ -293,7 +287,7 @@ static bool criteria_test(swayc_t *cont, list_t *tokens) {
 				if (focused->instance && strcmp(cont->instance, focused->instance) == 0) {
 					matches++;
 				}
-			} else if (crit->regex && regexec(crit->regex, cont->instance, 0, NULL, 0) == 0) {
+			} else if (crit->regex && regex_cmp(cont->instance, crit->regex) == 0) {
 				matches++;
 			}
 			break;
@@ -305,7 +299,7 @@ static bool criteria_test(swayc_t *cont, list_t *tokens) {
 				if (focused->name && strcmp(cont->name, focused->name) == 0) {
 					matches++;
 				}
-			} else if (crit->regex && regexec(crit->regex, cont->name, 0, NULL, 0) == 0) {
+			} else if (crit->regex && regex_cmp(cont->name, crit->regex) == 0) {
 				matches++;
 			}
 			break;
@@ -325,7 +319,7 @@ static bool criteria_test(swayc_t *cont, list_t *tokens) {
 				if (focused_ws->name && strcmp(cont_ws->name, focused_ws->name) == 0) {
 					matches++;
 				}
-			} else if (crit->regex && regexec(crit->regex, cont_ws->name, 0, NULL, 0) == 0) {
+			} else if (crit->regex && regex_cmp(cont_ws->name, crit->regex) == 0) {
 				matches++;
 			}
 			break;