Add initial version of hilex

hilex is meant to replace hi, based on lex rather than a mess of
overlapping regexps. I want to preserve hi's tagging abilities, but that
will require some amount of parsing/post-processing, which I'm not sure
how to approach yet.

Macro lexing for C still needs work, as I want to match strings and
comments inside macros.

1 files changed, 44 insertions, 0 deletions

diff --git a/bin/hilex/ansi.c b/bin/hilex/ansi.c
new file mode 100644
index 00000000..fab9c2ed
--- /dev/null
+++ b/bin/hilex/ansi.c
@@ -0,0 +1,44 @@
+/* Copyright (C) 2020  June McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "hilex.h"
+
+static const char *Color[ClassCap] = {
+	[Keyword] = "37",
+	[Macro] = "32",
+	[Comment] = "34",
+	[String] = "36",
+	[StringFormat] = "36;1;96",
+};
+
+static void format(const char *opts[], enum Class class, const char *text) {
+	(void)opts;
+	if (!Color[class]) {
+		printf("%s", text);
+		return;
+	}
+	// Set color on each line for piping to less -R:
+	for (const char *nl; (nl = strchr(text, '\n')); text = &nl[1]) {
+		printf("\33[%sm%.*s\33[m\n", Color[class], (int)(nl - text), text);
+	}
+	if (*text) printf("\33[%sm%s\33[m", Color[class], text);
+}
+
+const struct Formatter FormatANSI = { .format = format };