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Implement word wrapping

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It's about time
This commit is contained in:
jfreegman 2020-11-22 18:41:12 -05:00
parent 9d65997871
commit 8e84ac58d4
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GPG Key ID: 3627F3144076AE63
2 changed files with 133 additions and 46 deletions
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175
src/line_info.c
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@ -66,12 +66,12 @@ void line_info_reset_start(ToxWindow *self, struct history *hst)
int max_y = (y2 - CHATBOX_HEIGHT - top_offst);
int curlines = 0;
int nxtlines = line->newlines + (line->len / (x2 - side_offst));
int nxtlines = line->newlines + (line->format_len / (x2 - side_offst));
do {
curlines += 1 + nxtlines;
line = line->prev;
nxtlines = line->newlines + (line->len / (x2 - side_offst));
nxtlines = line->newlines + (line->format_len / (x2 - side_offst));
} while (line->prev && curlines + nxtlines < max_y);
hst->line_start = line;
@ -134,6 +134,92 @@ static struct line_info *line_info_ret_queue(struct history *hst)
return line;
}
/* Prints `n` chars from `s` to `win`.
*
* Return true if the string contains a newline or tab byte.
*/
static bool print_n_chars(WINDOW *win, const char *s, size_t n)
{
bool newline = false;
char ch;
for (size_t i = 0; i < n && (ch = s[i]); ++i) {
waddch(win, ch);
if (ch == '\n') {
newline = true;
}
}
return newline;
}
/* Returns the index of the last space character in `s` found before `limit`.
* Returns -1 if no space is found.
*/
static int rspace_index(const char *s, int limit)
{
for (int i = limit; i >= 0; --i) {
if (s[i] == ' ') {
return i;
}
}
return -1;
}
/* Prints line message to window, wrapping at the last word that fits on the current line.
*
* This function updates the `format_len` field of `line` according to current window dimensions.
*/
static void print_wrap(WINDOW *win, struct line_info *line, int max_x)
{
const char *msg = line->msg;
uint16_t length = line->msg_len;
uint16_t real_len = length;
const int x_start = line->len - line->msg_len - 1; // manually keep track of x position because ncurses sucks
while (msg) {
int x_limit = max_x - x_start;
if (length < x_limit || x_limit <= 0) {
wprintw(win, "%s", msg);
break;
}
int space_idx = rspace_index(msg, x_limit - 1);
if (space_idx >= 1) {
bool newline = print_n_chars(win, msg, space_idx);
msg += space_idx;
length -= space_idx;
x_limit -= space_idx;
// replace last space on current line with newline if we intend to split it
if (length >= x_limit && !newline) {
waddch(win, '\n');
--length;
++msg;
real_len += x_limit + 1; // include empty space at end of line
/* Add padding to the start of the next line */
for (size_t i = 0; i < x_start; ++i) {
waddch(win, ' ');
++real_len;
}
}
} else {
print_n_chars(win, msg, x_limit);
msg += x_limit;
length -= x_limit;
}
}
line->format_len = line->len - line->msg_len + real_len;
}
/* creates new line_info line and puts it in the queue.
*
* Returns the id of the new line.
@ -207,13 +293,14 @@ int line_info_add(ToxWindow *self, const char *timestr, const char *name1, const
break;
}
uint16_t msg_len = 0;
if (frmt_msg[0]) {
snprintf(new_line->msg, sizeof(new_line->msg), "%s", frmt_msg);
len += strlen(new_line->msg);
msg_len = strlen(new_line->msg);
len += msg_len;
int i;
for (i = 0; frmt_msg[i]; ++i) {
for (size_t i = 0; frmt_msg[i]; ++i) {
if (frmt_msg[i] == '\n') {
++new_line->newlines;
}
@ -237,6 +324,8 @@ int line_info_add(ToxWindow *self, const char *timestr, const char *name1, const
new_line->id = (hst->line_end->id + 1 + hst->queue_sz) % INT_MAX;
new_line->len = len;
new_line->format_len = len;
new_line->msg_len = msg_len;
new_line->type = type;
new_line->bold = bold;
new_line->colour = colour;
@ -278,13 +367,13 @@ static void line_info_check_queue(ToxWindow *self)
}
int offst = self->show_peerlist ? SIDEBAR_WIDTH : 0; /* offset width of conference sidebar */
int lines = 1 + line->newlines + (line->len / (x2 - offst));
int lines = 1 + line->newlines + (line->format_len / (x2 - offst));
int max_y = y2 - CHATBOX_HEIGHT;
/* move line_start forward proportionate to the number of new lines */
if (y + lines - 1 >= max_y) {
while (lines > 0 && hst->line_start->next) {
lines -= 1 + hst->line_start->next->newlines + (hst->line_start->next->len / (x2 - offst));
lines -= 1 + hst->line_start->next->newlines + (hst->line_start->next->format_len / (x2 - offst));
hst->line_start = hst->line_start->next;
++hst->start_id;
}
@ -314,7 +403,7 @@ void line_info_print(ToxWindow *self)
getmaxyx(self->window, y2, x2);
if (x2 <= SIDEBAR_WIDTH) {
if (x2 - 1 <= SIDEBAR_WIDTH) { // leave room on x axis for sidebar padding
return;
}
@ -326,6 +415,8 @@ void line_info_print(ToxWindow *self)
struct line_info *line = hst->line_start->next;
const int max_x = self->show_peerlist ? x2 - 1 - SIDEBAR_WIDTH : x2;
int numlines = 0;
while (line && numlines++ <= y2) {
@ -355,29 +446,23 @@ void line_info_print(ToxWindow *self)
wprintw(win, "%s %s: ", user_settings->line_normal, line->name1);
wattroff(win, COLOR_PAIR(nameclr));
char *msg = line->msg;
if (line->msg[0] == 0) {
waddch(win, '\n');
break;
}
while (msg) {
char *line = strsep(&msg, "\n");
if (line->msg[0] == '>') {
wattron(win, COLOR_PAIR(GREEN));
} else if (line->msg[0] == '<') {
wattron(win, COLOR_PAIR(RED));
}
if (line[0] == '>') {
wattron(win, COLOR_PAIR(GREEN));
} else if (line[0] == '<') {
wattron(win, COLOR_PAIR(RED));
}
print_wrap(win, line, max_x);
wprintw(win, "%s%c", line, msg ? '\n' : '\0');
if (line[0] == '>') {
wattroff(win, COLOR_PAIR(GREEN));
} else if (line[0] == '<') {
wattroff(win, COLOR_PAIR(RED));
}
// change the \0 set by strsep back to \n
if (msg) {
msg[-1] = '\n';
}
if (line->msg[0] == '>') {
wattroff(win, COLOR_PAIR(GREEN));
} else if (line->msg[0] == '<') {
wattroff(win, COLOR_PAIR(RED));
}
if (type == OUT_MSG && timed_out(line->timestamp, NOREAD_FLAG_TIMEOUT)) {
@ -391,7 +476,7 @@ void line_info_print(ToxWindow *self)
}
}
wprintw(win, "\n");
waddch(win, '\n');
break;
case OUT_ACTION_READ:
@ -406,7 +491,8 @@ void line_info_print(ToxWindow *self)
wattroff(win, COLOR_PAIR(BLUE));
wattron(win, COLOR_PAIR(YELLOW));
wprintw(win, "%s %s %s", user_settings->line_normal, line->name1, line->msg);
wprintw(win, "%s %s ", user_settings->line_normal, line->name1);
print_wrap(win, line, max_x);
wattroff(win, COLOR_PAIR(YELLOW));
if (type == OUT_ACTION && timed_out(line->timestamp, NOREAD_FLAG_TIMEOUT)) {
@ -420,7 +506,7 @@ void line_info_print(ToxWindow *self)
}
}
wprintw(win, "\n");
waddch(win, '\n');
break;
case SYS_MSG:
@ -438,7 +524,8 @@ void line_info_print(ToxWindow *self)
wattron(win, COLOR_PAIR(line->colour));
}
wprintw(win, "%s\n", line->msg);
print_wrap(win, line, max_x);
waddch(win, '\n');
if (line->bold) {
wattroff(win, A_BOLD);
@ -456,10 +543,10 @@ void line_info_print(ToxWindow *self)
wattroff(win, COLOR_PAIR(GREEN));
if (line->msg[0]) {
wprintw(win, "%s", line->msg);
print_wrap(win, line, max_x);
}
wprintw(win, "\n");
waddch(win, '\n');
break;
case CONNECTION:
@ -474,7 +561,9 @@ void line_info_print(ToxWindow *self)
wprintw(win, "%s ", line->name1);
wattroff(win, A_BOLD);
wprintw(win, "%s\n", line->msg);
print_wrap(win, line, max_x);
waddch(win, '\n');
wattroff(win, COLOR_PAIR(line->colour));
break;
@ -491,7 +580,9 @@ void line_info_print(ToxWindow *self)
wprintw(win, "%s ", line->name1);
wattroff(win, A_BOLD);
wprintw(win, "%s\n", line->msg);
print_wrap(win, line, max_x);
waddch(win, '\n');
wattroff(win, COLOR_PAIR(line->colour));
break;
@ -507,7 +598,7 @@ void line_info_print(ToxWindow *self)
wprintw(win, "%s", line->name1);
wattroff(win, A_BOLD);
wprintw(win, "%s", line->msg);
print_wrap(win, line, max_x);
wattron(win, A_BOLD);
wprintw(win, "%s\n", line->name2);
@ -541,11 +632,6 @@ void line_info_set(ToxWindow *self, uint32_t id, char *msg)
}
}
/* static void line_info_goto_root(struct history *hst)
{
hst->line_start = hst->line_root;
} */
static void line_info_scroll_up(struct history *hst)
{
if (hst->line_start->prev) {
@ -587,9 +673,8 @@ static void line_info_page_down(ToxWindow *self, struct history *hst)
UNUSED_VAR(x2);
int jump_dist = y2 / 2;
int i;
for (i = 0; i < jump_dist && hst->line_start->next; ++i) {
for (int i = 0; i < jump_dist && hst->line_start->next; ++i) {
hst->line_start = hst->line_start->next;
}
}

4
src/line_info.h
View File

@ -56,7 +56,9 @@ struct line_info {
uint8_t colour;
uint8_t noread_flag; /* true if a line should be flagged as unread */
uint32_t id;
uint16_t len; /* combined len of entire line */
uint16_t len; /* combined length of entire line */
uint16_t format_len; /* formatted length of combined string (dynamically set by print_wrap()) */
uint16_t msg_len; /* length of the message */
uint8_t newlines;
struct line_info *prev;