Add term.c for extra terminal features

Look at the cute little state machine!

Makefile

@@ -3,7 +3,7 @@ CFLAGS += -Wall -Wextra -Wpedantic
 CFLAGS += -I/usr/local/include -I/usr/local/opt/libressl/include
 LDFLAGS += -L/usr/local/lib -L/usr/local/opt/libressl/lib
 LDLIBS = -lcursesw -ltls
-OBJS = chat.o edit.o handle.o input.o irc.o pls.o tab.o tag.o ui.o url.o
+OBJS = chat.o edit.o handle.o input.o irc.o pls.o tab.o tag.o term.o ui.o url.o
 
 all: tags chat
 

README

@@ -9,6 +9,7 @@ This software requires LibreSSL and targets FreeBSD and Darwin.
 	input.c     Input command handling
 	irc.c       TLS client connection
 	ui.c        Curses UI and mIRC formatting
+	term.c      Terminal features unsupported by curses
 	edit.c      Line editing
 	tab.c       Tab-complete
 	url.c       URL detection

chat.h

@@ -79,6 +79,20 @@ void uiTopic(struct Tag tag, const char *topic);
 void uiLog(struct Tag tag, const wchar_t *line);
 void uiFmt(struct Tag tag, const wchar_t *format, ...);
 
+enum TermMode {
+	TERM_FOCUS,
+	TERM_PASTE,
+};
+enum TermEvent {
+	TERM_NONE,
+	TERM_FOCUS_IN,
+	TERM_FOCUS_OUT,
+	TERM_PASTE_START,
+	TERM_PASTE_END,
+};
+void termMode(enum TermMode mode, bool set);
+enum TermEvent termEvent(char ch);
+
 enum Edit {
 	EDIT_LEFT,
 	EDIT_RIGHT,

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;
+}