Implement the beginnings of UI

It takes so much code to do anything in curses...

1 files changed, 174 insertions, 0 deletions

diff --git a/ui.c b/ui.c
new file mode 100644
index 0000000..0295c8d
--- /dev/null
+++ b/ui.c
@@ -0,0 +1,174 @@
+/* Copyright (C) 2020  C. McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <curses.h>
+#include <err.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <time.h>
+
+#include "chat.h"
+
+#ifndef A_ITALIC
+#define A_ITALIC A_UNDERLINE
+#endif
+
+#define BOTTOM (LINES - 1)
+#define RIGHT (COLS - 1)
+#define WINDOW_LINES (LINES - 2)
+
+static short colorPairs;
+
+static void colorInit(void) {
+	start_color();
+	use_default_colors();
+	for (short pair = 0; pair < 16; ++pair) {
+		init_pair(1 + pair, pair % COLORS, -1);
+	}
+	colorPairs = 17;
+}
+
+static attr_t colorAttr(short fg) {
+	return (fg >= COLORS ? A_BOLD : A_NORMAL);
+}
+
+static short colorPair(short fg, short bg) {
+	if (bg == -1) return 1 + fg;
+	for (short pair = 17; pair < colorPairs; ++pair) {
+		short f, b;
+		pair_content(pair, &f, &b);
+		if (f == fg && b == bg) return pair;
+	}
+	init_pair(colorPairs, fg, bg);
+	return colorPairs++;
+}
+
+enum {
+	InputCols = 512,
+	PadLines = 512,
+};
+
+static WINDOW *status;
+static WINDOW *input;
+
+struct Window {
+	size_t id;
+	WINDOW *pad;
+	enum Heat heat;
+	int unread;
+	int scroll;
+	bool mark;
+	struct Window *prev;
+	struct Window *next;
+};
+
+static struct {
+	struct Window *active;
+	struct Window *other;
+	struct Window *head;
+	struct Window *tail;
+} windows;
+
+static void windowAdd(struct Window *window) {
+	if (windows.tail) windows.tail->next = window;
+	window->prev = windows.tail;
+	window->next = NULL;
+	windows.tail = window;
+	if (!windows.head) windows.head = window;
+}
+
+static void windowRemove(struct Window *window) {
+	if (window->prev) window->prev->next = window->next;
+	if (window->next) window->next->prev = window->prev;
+	if (windows.head == window) windows.head = window->next;
+	if (windows.tail == window) windows.tail = window->prev;
+}
+
+static struct Window *windowFor(size_t id) {
+	struct Window *window;
+	for (window = windows.head; window; window = window->next) {
+		if (window->id == id) return window;
+	}
+	window = malloc(sizeof(*window));
+	if (!window) err(EX_OSERR, "malloc");
+	window->id = id;
+	window->pad = newpad(PadLines, COLS);
+	wsetscrreg(window->pad, 0, PadLines - 1);
+	scrollok(window->pad, true);
+	wmove(window->pad, PadLines - 1, 0);
+	window->heat = Cold;
+	window->unread = 0;
+	window->scroll = PadLines;
+	window->mark = true;
+	windowAdd(window);
+	return window;
+}
+
+void uiInit(void) {
+	initscr();
+	cbreak();
+	noecho();
+	termInit();
+	termNoFlow();
+	def_prog_mode();
+	colorInit();
+	status = newwin(1, COLS, 0, 0);
+	input = newpad(1, InputCols);
+	keypad(input, true);
+	nodelay(input, true);
+	windows.active = windowFor(Network);
+}
+
+void uiDraw(void) {
+	wnoutrefresh(status);
+	pnoutrefresh(
+		windows.active->pad,
+		windows.active->scroll - WINDOW_LINES, 0,
+		1, 0,
+		BOTTOM - 1, RIGHT
+	);
+	// TODO: Input scrolling.
+	pnoutrefresh(
+		input,
+		0, 0,
+		BOTTOM, 0,
+		BOTTOM, RIGHT
+	);
+	doupdate();
+}
+
+void uiWrite(size_t id, enum Heat heat, const struct tm *time, const char *str) {
+	(void)time;
+	struct Window *window = windowFor(id);
+	waddch(window->pad, '\n');
+	waddstr(window->pad, str);
+}
+
+void uiFormat(
+	size_t id, enum Heat heat, const struct tm *time, const char *format, ...
+) {
+	char buf[1024];
+	va_list ap;
+	va_start(ap, format);
+	int len = vsnprintf(buf, sizeof(buf), format, ap);
+	va_end(ap);
+	assert((size_t)len < sizeof(buf));
+	uiWrite(id, heat, time, buf);
+}