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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "doc.h"
#include "err.h"
/* text */
static struct {
char *buf;
size_t len, cap;
} txt;
void txt_init(void) {
txt.buf = malloc(1);
if (!txt.buf) efatal("txt_init");
txt.buf[0] = 0;
txt.len = 0;
txt.cap = 1;
}
void txt_fini(void) {
free(txt.buf);
}
void txt_grow(size_t n) {
size_t cap = txt.cap;
size_t len = txt.len + n;
if (cap < len) {
while (cap < len) cap <<= 1;
char *s = realloc(txt.buf, cap);
if (!s) efatal("txt_grow");
txt.cap = cap;
txt.buf = s;
}
}
/* docs */
struct doc {
size_t ofs, len, idx;
};
#define DOC_MAX 32
static struct doc docv[DOC_MAX] = {
{
.ofs = 0,
.len = 0,
.idx = 0
}
};
static size_t docn = 0, doci = 0;
void doc_pop(void) {
if (docn > 0) {
docn--;
if (doci > 0) doci--;
}
}
void doc_shift(void) {
if (docn > 0) {
docn--;
memmove(txt.buf, txt.buf + docv[0].len, txt.len - docv[0].len);
memmove(&docv[0], &docv[1], docn * sizeof(struct doc));
docv[0].ofs = 0;
for (int i = 1; i < docn; i++) {
docv[i].idx = docv[i - 1].ofs + (docv[i].idx - docv[i].ofs);
docv[i].ofs = docv[i - 1].ofs + docv[i - 1].len;
}
if (docn > 0 && doci >= docn) doci = docn - 1;
}
}
void doc_new(void) {
while (docn >= DOC_MAX) {
doc_shift();
}
if (doci < docn) {
txt.len = docv[doci].ofs;
docn = doci;
}
memset(&docv[docn], 0, sizeof(struct doc));
docv[docn].ofs = txt.len;
docv[docn].idx = txt.len;
doci = docn++;
}
void doc_add(const char *buf, size_t n) {
txt_grow(n);
memcpy(&txt.buf[txt.len], buf, n);
txt.len += n;
docv[doci].len += n;
}
void doc_adds(const char *s) {
doc_add(s, strlen(s));
}
void doc_prev(void) {
if (doci > 0) doci--;
}
void doc_next(void) {
if (doci < docn) doci++;
}
void doc_back_line(void) {
if (doci >= docn) return;
struct doc *d = &docv[doci];
size_t i = d->idx;
while (i > 0 && txt.buf[d->idx] != '\n') i--;
if (i > 0) i--;
while (i > 0 && txt.buf[d->idx] != '\n') i--;
if (i > 0) i++;
d->idx = i;
}
void doc_print_line(void) {
if (doci >= docn) return;
struct doc *d = &docv[doci];
size_t i = d->idx;
size_t n = d->ofs + d->len;
while (i < n && txt.buf[d->idx] != '\n') {
putchar(txt.buf[i++]);
}
if (i < n) i++;
d->idx = i;
}
void doc_init(void) {
txt_init();
doc_new();
doc_adds("Type ? for command help.\n");
}
void doc_fini(void) {
txt_fini();
}
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