Add term.c for extra terminal features

Look at the cute little state machine!

1 files changed, 53 insertions, 0 deletions

diff --git a/term.c b/term.c
new file mode 100644
index 0000000..c603d32
--- /dev/null
+++ b/term.c
@@ -0,0 +1,53 @@
+/* Copyright (C) 2018  Curtis 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 <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "chat.h"
+
+#define PAIR(a, b) (((short)(a) << 8) | ((short)(b) & 0xFF))
+
+static void privateMode(const char *mode, bool set) {
+	printf("\33[?%s%c", mode, (set ? 'h' : 'l'));
+	fflush(stdout);
+}
+
+void termMode(enum TermMode mode, bool set) {
+	switch (mode) {
+		break; case TERM_FOCUS: privateMode("1004", set);
+		break; case TERM_PASTE: privateMode("2004", set);
+	}
+}
+
+enum TermEvent termEvent(char ch) {
+	static char state = '\0';
+	switch (PAIR(state, ch)) {
+		break; case PAIR('\0', '\33'): state = '\33';
+		break; case PAIR('\33', '['):  state = '[';
+		break; case PAIR('[', 'I'):    state = '\0'; return TERM_FOCUS_IN;
+		break; case PAIR('[', 'O'):    state = '\0'; return TERM_FOCUS_OUT;
+		break; case PAIR('[', '2'):    state = '2';
+		break; case PAIR('2', '0'):    state = '0';
+		break; case PAIR('0', '0'):    state = '0';
+		break; case PAIR('0', '~'):    state = '\0'; return TERM_PASTE_START;
+		break; case PAIR('0', '1'):    state = '1';
+		break; case PAIR('1', '~'):    state = '\0'; return TERM_PASTE_END;
+		break; default:                state = '\0';
+	}
+	return TERM_NONE;
+}