From 4bfae2f646237d21d2ab2714241fe5273759526c Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Sat, 6 Feb 2021 22:56:36 -0500
Subject: pcre2

---
 .gitignore |  3 +++
 Makefile   | 15 +++++++++++----
 README.md  |  1 +
 main.c     | 38 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index c3220c4..feb6ce6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,4 +10,7 @@ TAGS
 *.pdb
 *.ilk
 *.res
+*.zip
+*.a
+pcre2-10.36
 SDL2
diff --git a/Makefile b/Makefile
index 23fddd6..f51aa9b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,17 +1,17 @@
 ALL_CFLAGS=$(CFLAGS) -Wall -Wextra -Wshadow -Wconversion -Wpedantic -pedantic -std=gnu11 \
 	-Wno-unused-function -Wno-fixed-enum-extension -Wimplicit-fallthrough -Wno-format-truncation -Wno-unknown-warning-option
-LIBS=-lSDL2 -lGL -ldl -lm
+LIBS=-lSDL2 -lGL -ldl -lm libpcre2-32.a -Ipcre2-10.36/build
 DEBUG_CFLAGS=$(ALL_CFLAGS) -DDEBUG -O0 -g
 RELEASE_CFLAGS=$(ALL_CFLAGS) -O3
 PROFILE_CFLAGS=$(ALL_CFLAGS) -O3 -DPROFILE=1
 GLOBAL_DATA_DIR=/usr/share/ted
 LOCAL_DATA_DIR=/home/`logname`/.local/share/ted
 INSTALL_BIN_DIR=/usr/bin
-ted: *.[ch]
+ted: *.[ch] libpcre2-32.a
 	$(CC) main.c -o ted $(DEBUG_CFLAGS) $(LIBS)
-release: *.[ch]
+release: *.[ch] libpcre2-32.a
 	$(CC) main.c -o ted $(RELEASE_CFLAGS) $(LIBS)
-profile: *.[ch]
+profile: *.[ch] libpcre2-32.a
 	$(CC) main.c -o ted $(PROFILE_CFLAGS) $(LIBS)
 clean:
 	rm -f ted *.o
@@ -25,3 +25,10 @@ install: release
 	install -m 644 ted.cfg $(GLOBAL_DATA_DIR)
 	[ ! -e $(LOCAL_DATA_DIR)/ted.cfg ] && install -o `logname` -g `logname` -m 644 ted.cfg $(LOCAL_DATA_DIR) || :
 	install ted $(INSTALL_BIN_DIR)
+libpcre2-32.a: pcre2-10.36.zip
+	rm -rf pcre2-10.36
+	unzip $<
+	mkdir pcre2-10.36/build
+	cd pcre2-10.36/build && cmake -DPCRE2_BUILD_PCRE2_32=ON .. && $(MAKE) -j8
+	cp pcre2-10.36/build/$@ ./
+
diff --git a/README.md b/README.md
index 41e9497..7e17462 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,7 @@ sudo apt install gcc libsdl2-dev libgl-dev
 Then run
 
 ```
+wget https://ftp.pcre.org/pub/pcre/pcre2-10.36.zip
 sudo make install -j4
 ```
 
diff --git a/main.c b/main.c
index a7fbda0..cf0af05 100644
--- a/main.c
+++ b/main.c
@@ -18,6 +18,8 @@ no_warn_end
 #if _WIN32
 #include <shellapi.h>
 #endif
+#define PCRE2_CODE_UNIT_WIDTH 32
+#include "pcre2.h"
 
 #include "unicode.h"
 #include "util.c"
@@ -115,6 +117,42 @@ int main(int argc, char **argv) {
 #endif
 	setlocale(LC_ALL, ""); // allow unicode
 
+	int error = 0;
+	PCRE2_SIZE error_pos = 0;
+	pcre2_code *regex = pcre2_compile(U"a(.)b", 5, 0, &error, &error_pos, NULL);
+	if (regex) {
+		print("Compiled to %p\n",(void *)regex);
+		pcre2_match_data *match_data = pcre2_match_data_create(100, NULL);
+		if (match_data) {
+			int ret = pcre2_match(regex, U"acb", 3, 0, 0, match_data, NULL);
+			if (ret > 0) {
+				size_t group_count = (size_t)ret;
+				PCRE2_SIZE *groups = pcre2_get_ovector_pointer(match_data);
+				for (size_t i = 0; i < group_count; ++i) {
+					size_t start = (size_t)groups[2*i];
+					size_t end = (size_t)groups[2*i+1];
+					print("%zu-%zu\n", start, end);
+				}
+				print("Match\n");
+			} else {
+				print("No match\n");
+			}
+			pcre2_match_data_free(match_data);
+		} else {
+			print("Couldn't create match data.\n");
+		}
+		pcre2_code_free(regex);
+	} else {
+		char32_t buf[256] = {0};
+		size_t len = (size_t)pcre2_get_error_message(error, buf, sizeof buf - 1);
+		char *error_cstr = str32_to_utf8_cstr(str32(buf, len));
+		if (error_cstr) {
+			print("Error %d at %zu: %s\n", error, error_pos, error_cstr);
+			free(error_cstr);
+		}
+	}
+
+
 	// read command-line arguments
 	char const *starting_filename = NULL;
 	switch (argc) {
-- 
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