Implement buffer line wrapping

Not yet rendered in the UI! Just done in parallel.
master
C. McEnroe 2020-09-01 22:54:26 -04:00
parent 8d1d758053
commit 4dc87ab9cd
2 changed files with 97 additions and 9 deletions

104
buffer.c
View File

@ -28,8 +28,10 @@
#include <err.h> #include <err.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h>
#include <sysexits.h> #include <sysexits.h>
#include <time.h> #include <time.h>
#include <wchar.h>
#include "chat.h" #include "chat.h"
@ -63,6 +65,12 @@ static const struct Line *linesLine(const struct Lines *lines, size_t i) {
return (line->str ? line : NULL); return (line->str ? line : NULL);
} }
static struct Line *linesNext(struct Lines *lines) {
struct Line *line = &lines->lines[lines->len++ % BufferCap];
free(line->str);
return line;
}
const struct Line *bufferSoft(const struct Buffer *buffer, size_t i) { const struct Line *bufferSoft(const struct Buffer *buffer, size_t i) {
return linesLine(&buffer->soft, i); return linesLine(&buffer->soft, i);
} }
@ -71,23 +79,103 @@ const struct Line *bufferHard(const struct Buffer *buffer, size_t i) {
return linesLine(&buffer->hard, i); return linesLine(&buffer->hard, i);
} }
static void flow(struct Lines *hard, int cols, const struct Line *soft) { enum { StyleCap = 10 };
(void)hard; static void styleCat(struct Cat *cat, struct Style style) {
(void)cols; catf(
(void)soft; cat, "%s%s%s%s",
(style.attr & Bold ? (const char []) { B, '\0' } : ""),
(style.attr & Reverse ? (const char []) { R, '\0' } : ""),
(style.attr & Italic ? (const char []) { I, '\0' } : ""),
(style.attr & Underline ? (const char []) { U, '\0' } : "")
);
if (style.fg != Default || style.bg != Default) {
catf(cat, "\3%02d,%02d", style.fg, style.bg);
}
} }
void bufferPush( static const wchar_t ZWS = L'\u200B';
static const wchar_t ZWNJ = L'\u200C';
static int flow(struct Lines *hard, int cols, const struct Line *soft) {
int flowed = 1;
struct Line *line = linesNext(hard);
line->heat = soft->heat;
line->time = soft->time;
line->str = strdup(soft->str);
if (!line->str) err(EX_OSERR, "strdup");
int width = 0;
int align = 0;
char *wrap = NULL;
struct Style style = StyleDefault;
for (char *str = line->str; *str;) {
size_t len = styleParse(&style, (const char **)&str);
if (*str == '\t' && !align) {
align = width + 1;
*str = ' ';
}
if (isspace(*str) || *str == '-') {
wrap = str;
}
wchar_t wc;
int n = mbtowc(&wc, str, len);
if (n <= 0) continue;
if (wc == ZWS || wc == ZWNJ) {
// XXX: ncurses likes to render these as spaces when they should be
// zero-width, so just remove them entirely.
memmove(str, &str[n], strlen(&str[n]) + 1);
continue;
} else if (wc < L' ') {
// XXX: ncurses will render these as "^A".
width += 2;
} else if (wcwidth(wc) > 0) {
width += wcwidth(wc);
}
if (width < cols) {
str += n;
continue;
}
if (!wrap) wrap = str;
flowed++;
line = linesNext(hard);
line->heat = soft->heat;
line->time = soft->time;
size_t cap = StyleCap + align + strlen(&wrap[1]) + 1;
line->str = malloc(cap);
if (!line->str) err(EX_OSERR, "malloc");
struct Cat cat = { line->str, cap, 0 };
styleCat(&cat, style);
str = &line->str[cat.len];
catf(&cat, "%*s%n%s", align, "", &width, &wrap[1]);
str += width;
if (isspace(*wrap)) {
wrap[0] = '\0';
} else {
wrap[1] = '\0';
}
wrap = NULL;
}
return flowed;
}
int bufferPush(
struct Buffer *buffer, int cols, struct Buffer *buffer, int cols,
enum Heat heat, time_t time, const char *str enum Heat heat, time_t time, const char *str
) { ) {
struct Line *soft = &buffer->soft.lines[buffer->soft.len++ % BufferCap]; struct Line *soft = linesNext(&buffer->soft);
free(soft->str);
soft->heat = heat; soft->heat = heat;
soft->time = time; soft->time = time;
soft->str = strdup(str); soft->str = strdup(str);
if (!soft->str) err(EX_OSERR, "strdup"); if (!soft->str) err(EX_OSERR, "strdup");
flow(&buffer->hard, cols, soft); return flow(&buffer->hard, cols, soft);
} }
void bufferReflow(struct Buffer *buffer, int cols) { void bufferReflow(struct Buffer *buffer, int cols) {

2
chat.h
View File

@ -287,7 +287,7 @@ struct Buffer *bufferAlloc(void);
void bufferFree(struct Buffer *buffer); void bufferFree(struct Buffer *buffer);
const struct Line *bufferSoft(const struct Buffer *buffer, size_t i); const struct Line *bufferSoft(const struct Buffer *buffer, size_t i);
const struct Line *bufferHard(const struct Buffer *buffer, size_t i); const struct Line *bufferHard(const struct Buffer *buffer, size_t i);
void bufferPush( int bufferPush(
struct Buffer *buffer, int cols, struct Buffer *buffer, int cols,
enum Heat heat, time_t time, const char *str enum Heat heat, time_t time, const char *str
); );