Implement line editing, scrolling

Don't really have a way to implement the M-* keys, and currently missing
C-w.
master
Curtis McEnroe 2018-08-04 20:54:50 -04:00
parent ababcbb080
commit 8fdf2c402d
No known key found for this signature in database
GPG Key ID: CEA2F97ADCFCD77C
1 changed files with 138 additions and 33 deletions

171
ui.c
View File

@ -33,8 +33,10 @@
#define A_ITALIC A_NORMAL
#endif
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define CTRL(c) ((c) & 037)
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
static const int TOPIC_COLS = 512;
static const int INPUT_COLS = 512;
@ -44,15 +46,25 @@ static struct {
WINDOW *topic;
WINDOW *log;
WINDOW *input;
int scroll;
size_t cursor;
} ui;
static int lastLine(void) {
return LINES - 1;
}
static int lastCol(void) {
return COLS - 1;
}
static int logHeight(void) {
return LINES - 4;
}
void uiInit(void) {
setlocale(LC_CTYPE, "");
initscr();
cbreak();
noecho();
keypad(stdscr, true);
start_color();
use_default_colors();
@ -70,11 +82,14 @@ void uiInit(void) {
ui.log = newpad(LOG_LINES, COLS);
wsetscrreg(ui.log, 0, LOG_LINES - 1);
scrollok(ui.log, true);
wmove(ui.log, LOG_LINES - (LINES - 4) - 1, 0);
wmove(ui.log, LOG_LINES - logHeight() - 1, 0);
ui.scroll = LOG_LINES;
ui.input = newpad(2, INPUT_COLS);
mvwhline(ui.input, 0, 0, ACS_HLINE, INPUT_COLS);
wmove(ui.input, 1, ui.cursor);
keypad(ui.input, true);
nodelay(ui.input, true);
}
@ -88,26 +103,23 @@ void uiHide(void) {
}
void uiDraw(void) {
int lastCol = COLS - 1;
int lastLine = LINES - 1;
pnoutrefresh(
ui.topic,
0, 0,
0, 0,
1, lastCol
1, lastCol()
);
pnoutrefresh(
ui.log,
LOG_LINES - (LINES - 4), 0,
ui.scroll - logHeight(), 0,
2, 0,
lastLine - 2, lastCol
lastLine() - 2, lastCol()
);
pnoutrefresh(
ui.input,
0, MAX(0, ui.cursor - lastCol),
lastLine - 1, 0,
lastLine, lastCol
0, MAX(0, ui.cursor - lastCol() + 1),
lastLine() - 1, 0,
lastLine(), lastCol()
);
doupdate();
}
@ -210,31 +222,124 @@ void uiFmt(const char *format, ...) {
free(buf);
}
void uiRead(void) {
static wchar_t buf[512];
static size_t len;
static void scrollUp(void) {
if (ui.scroll == logHeight()) return;
ui.scroll = MAX(ui.scroll - logHeight() / 2, logHeight());
}
static void scrollDown(void) {
if (ui.scroll == LOG_LINES) return;
ui.scroll = MIN(ui.scroll + logHeight() / 2, LOG_LINES);
}
static struct {
wchar_t buf[512];
size_t len;
} line;
static const size_t BUF_LEN = sizeof(line.buf) / sizeof(line.buf[0]);
static void moveLeft(void) {
if (ui.cursor) ui.cursor--;
}
static void moveRight(void) {
if (ui.cursor < line.len) ui.cursor++;
}
static void moveHome(void) {
ui.cursor = 0;
}
static void moveEnd(void) {
ui.cursor = line.len;
}
static void insert(wchar_t ch) {
if (!iswprint(ch)) return;
if (line.len == BUF_LEN - 1) return;
if (ui.cursor == line.len) {
line.buf[line.len] = ch;
} else {
wmemmove(
&line.buf[ui.cursor + 1],
&line.buf[ui.cursor],
line.len - ui.cursor
);
line.buf[ui.cursor] = ch;
}
line.len++;
ui.cursor++;
}
static void backspace(void) {
if (!ui.cursor) return;
if (ui.cursor != line.len) {
wmemmove(
&line.buf[ui.cursor - 1],
&line.buf[ui.cursor],
line.len - ui.cursor
);
}
line.len--;
ui.cursor--;
}
static void delete(void) {
if (ui.cursor == line.len) return;
moveRight();
backspace();
}
static void kill(void) {
line.len = ui.cursor;
}
static void enter(void) {
if (!line.len) return;
line.buf[line.len] = '\0';
input(line.buf);
line.len = 0;
ui.cursor = 0;
}
static void keyChar(wint_t ch) {
switch (ch) {
break; case CTRL('B'): moveLeft();
break; case CTRL('F'): moveRight();
break; case CTRL('A'): moveHome();
break; case CTRL('E'): moveEnd();
break; case CTRL('D'): delete();
break; case CTRL('K'): kill();
break; case '\b': backspace();
break; case '\177': backspace();
break; case '\n': enter();
break; default: insert(ch);
}
}
static void keyCode(wint_t ch) {
switch (ch) {
break; case KEY_RESIZE: uiResize();
break; case KEY_PPAGE: scrollUp();
break; case KEY_NPAGE: scrollDown();
break; case KEY_LEFT: moveLeft();
break; case KEY_RIGHT: moveRight();
break; case KEY_HOME: moveHome();
break; case KEY_END: moveEnd();
break; case KEY_BACKSPACE: backspace();
break; case KEY_DC: delete();
break; case KEY_ENTER: enter();
}
}
void uiRead(void) {
int ret;
wint_t ch;
while (wget_wch(ui.input, &ch) != ERR) {
switch (ch) {
break; case KEY_RESIZE: uiResize();
break; case '\b': case '\177': {
if (len) len--;
}
break; case '\n': {
if (!len) break;
buf[len] = '\0';
input(buf);
len = 0;
}
break; default: {
// TODO: Check overflow
if (iswprint(ch)) buf[len++] = ch;
}
while (ERR != (ret = wget_wch(ui.input, &ch))) {
if (ret == KEY_CODE_YES) {
keyCode(ch);
} else {
keyChar(ch);
}
}
wmove(ui.input, 1, 0);
waddnwstr(ui.input, buf, len);
waddnwstr(ui.input, line.buf, line.len);
wclrtoeol(ui.input);
ui.cursor = len;
wmove(ui.input, 1, ui.cursor);
}