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toaruos/userspace/bim.c
Kevin Lange 659d044614 Terminal fixes
2012-11-30 15:50:06 -08:00

1026 lines
21 KiB
C
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/*
* bim
*
* Bim is a Bad IMitation of Vim.
*
* The 'standard' text editor for とあるOS.
*
*/
#define _XOPEN_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#ifdef __linux__
#include <stdio_ext.h>
#include <sys/ioctl.h>
#include <termios.h>
#define BACKSPACE_KEY 0x7F
#else
#include <syscall.h>
#define BACKSPACE_KEY 0x08
#endif
#include <wchar.h>
int mk_wcwidth_cjk(wchar_t ucs);
#include "lib/utf8decode.h"
#define BLOCK_SIZE 256
#define ENTER_KEY '\n'
typedef struct {
uint8_t display_width;
uint16_t codepoint;
} __attribute__((packed)) char_t;
typedef struct {
uint32_t available;
uint32_t actual;
char_t text[0];
} line_t;
int term_width, term_height;
int csr_x_actual, csr_y_actual;
typedef struct _env {
int bottom_size;
short lineno_width;
char * file_name;
int offset;
int coffset;
int line_no;
int line_count;
int line_avail;
int col_no;
short modified;
line_t ** lines;
} buffer_t;
buffer_t * env;
uint32_t buffers_len;
uint32_t buffers_avail;
buffer_t ** buffers;
buffer_t * buffer_new() {
if (buffers_len == buffers_avail) {
buffers_avail *= 2;
buffers = realloc(buffers, sizeof(buffer_t *) * buffers_avail);
}
buffers[buffers_len] = malloc(sizeof(buffer_t));
memset(buffers[buffers_len], 0x00, sizeof(buffer_t));
buffers_len++;
return buffers[buffers_len-1];
}
buffer_t * buffer_close(buffer_t * buf) {
uint32_t i;
for (i = 0; i < buffers_len; i++) {
if (buf == buffers[i])
break;
}
if (i == buffers_len) {
return env; /* wtf */
}
if (i != buffers_len - 1) {
memmove(&buffers[i], &buffers[i+1], buffers_len - i);
}
buffers_len--;
if (!buffers_len) {
return NULL;
}
if (i == buffers_len) {
return buffers[buffers_len-1];
}
return buffers[buffers_len];
}
line_t * line_insert(line_t * line, char_t c, uint32_t offset) {
if (line->actual == line->available) {
line->available *= 2;
line = realloc(line, sizeof(line_t) + sizeof(char_t) * line->available);
}
if (offset < line->actual) {
memmove(&line->text[offset+1], &line->text[offset], sizeof(char_t) * (line->actual - offset));
}
line->text[offset] = c;
line->actual += 1;
return line;
}
void line_delete(line_t * line, uint32_t offset) {
if (offset == 0) return;
if (offset < line->actual) {
memmove(&line->text[offset-1], &line->text[offset], sizeof(char_t) * (line->actual - offset - 1));
}
line->actual -= 1;
}
line_t ** add_line(line_t ** lines, uint32_t offset) {
if (env->line_count == env->line_avail) {
env->line_avail *= 2;
lines = realloc(lines, sizeof(line_t *) * env->line_avail);
}
if (offset < env->line_count) {
memmove(&lines[offset+1], &lines[offset], sizeof(line_t *) * (env->line_count - offset));
}
lines[offset] = malloc(sizeof(line_t) + sizeof(char_t) * 32);
lines[offset]->available = 32;
lines[offset]->actual = 0;
env->line_count += 1;
return lines;
}
line_t ** split_line(line_t ** lines, uint32_t line, uint32_t split) {
if (split == 0) {
return add_line(lines, line - 1);
}
if (env->line_count == env->line_avail) {
env->line_avail *= 2;
lines = realloc(lines, sizeof(line_t *) * env->line_avail);
}
if (line < env->line_count) {
memmove(&lines[line+1], &lines[line], sizeof(line_t *) * (env->line_count - line));
}
uint32_t remaining = lines[line-1]->actual - split;
uint32_t v = remaining;
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
lines[line] = malloc(sizeof(line_t) + sizeof(char_t) * v);
lines[line]->available = v;
lines[line]->actual = remaining;
memmove(lines[line]->text, &lines[line-1]->text[split], sizeof(char_t) * remaining);
lines[line-1]->actual = split;
env->line_count += 1;
return lines;
}
void setup_buffer(buffer_t * env) {
if (env->lines) {
for (int i = 0; i < env->line_count; ++i) {
free(env->lines[i]);
}
free(env->lines);
}
env->line_no = 1;
env->col_no = 1;
env->line_count = 1; /* XXX */
env->modified = 0;
env->bottom_size = 2;
env->offset = 0;
env->line_avail = 8;
env->lines = malloc(sizeof(line_t *) * env->line_avail);
env->lines[0] = malloc(sizeof(line_t) + sizeof(char_t) * 32);
env->lines[0]->available = 32;
env->lines[0]->actual = 0;
}
#define COLOR_FG 230
#define COLOR_BG 235
#define COLOR_CURSOR 15
#define COLOR_ALT_FG 244
#define COLOR_ALT_BG 236
#define COLOR_NUMBER_BG 232
#define COLOR_NUMBER_FG 101
#define COLOR_STATUS_BG 238
#define COLOR_TABBAR_BG 230
#define COLOR_TAB_BG 248
#define COLOR_ERROR_FG 15
#define COLOR_ERROR_BG 196
uint32_t codepoint;
uint32_t codepoint_r;
uint32_t state = 0;
uint32_t istate = 0;
#ifdef __linux__
struct termios old;
#endif
void set_unbuffered() {
#ifdef __linux__
tcgetattr(fileno(stdin), &old);
struct termios new = old;
new.c_lflag &= (~ICANON & ~ECHO);
tcsetattr(fileno(stdin), TCSAFLUSH, &new);
#else
printf("\033[1560z");
fflush(stdout);
#endif
}
void set_buffered() {
#ifdef __linux__
tcsetattr(fileno(stdin), TCSAFLUSH, &old);
#else
printf("\033[1561z");
fflush(stdout);
#endif
}
int to_eight(uint16_t codepoint, uint8_t * out) {
memset(out, 0x00, 4);
if (codepoint < 0x0080) {
out[0] = (uint8_t)codepoint;
} else if (codepoint < 0x0800) {
out[0] = 0xC0 | (codepoint >> 6);
out[1] = 0x80 | (codepoint & 0x3F);
} else {
out[0] = 0xE0 | (codepoint >> 12);
out[1] = 0x80 | ((codepoint >> 6) & 0x3F);
out[2] = 0x80 | (codepoint & 0x3F);
}
return strlen(out);
}
int codepoint_width(uint16_t codepoint) {
if (codepoint < 32) {
return 4;
}
if (codepoint > 256) {
return mk_wcwidth_cjk(codepoint);
}
return 1;
}
void place_cursor(int x, int y) {
printf("\033[%d;%dH", y, x);
fflush(stdout);
}
void place_cursor_h(int h) {
printf("\033[%dG", h);
fflush(stdout);
}
void set_colors(int fg, int bg) {
printf("\033[48;5;%dm", bg);
printf("\033[38;5;%dm", fg);
fflush(stdout);
}
void clear_to_end() {
printf("\033[K");
fflush(stdout);
}
void set_bold() {
printf("\033[1m");
fflush(stdout);
}
void set_underline() {
printf("\033[4m");
fflush(stdout);
}
void reset() {
printf("\033[0m");
fflush(stdout);
}
void clear_screen() {
printf("\033[H\033[2J");
fflush(stdout);
}
void redraw_tabbar() {
place_cursor(1,1);
for (uint32_t i = 0; i < buffers_len; i++) {
buffer_t * _env = buffers[i];
if (_env == env) {
reset();
set_colors(COLOR_FG, COLOR_BG);
set_bold();
} else {
reset();
set_colors(COLOR_FG, COLOR_TAB_BG);
set_underline();
}
if (_env->modified) {
printf(" +");
}
if (_env->file_name) {
printf(" %s ", _env->file_name);
} else {
printf(" [No Name] ");
}
}
reset();
set_colors(COLOR_FG, COLOR_TABBAR_BG);
clear_to_end();
}
int log_base_10(unsigned int v) {
int r = (v >= 1000000000) ? 9 : (v >= 100000000) ? 8 : (v >= 10000000) ? 7 :
(v >= 1000000) ? 6 : (v >= 100000) ? 5 : (v >= 10000) ? 4 :
(v >= 1000) ? 3 : (v >= 100) ? 2 : (v >= 10) ? 1 : 0;
return r;
}
void render_line(line_t * line, int width, int offset) {
uint32_t i = 0;
uint32_t j = 0;
set_colors(COLOR_FG, COLOR_BG);
while (i < line->actual) {
char_t c = line->text[i];
if (j >= offset) {
if (j - offset + c.display_width >= width) {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
while (j - offset < width - 1) {
printf("-");
j++;
}
printf(">");
break;
}
if (c.codepoint == '\t') {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("»···");
set_colors(COLOR_FG, COLOR_BG);
} else if (c.codepoint < 32) {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("<%02x>", c.codepoint);
set_colors(COLOR_FG, COLOR_BG);
} else {
char tmp[4];
to_eight(c.codepoint, tmp);
printf("%s", tmp);
}
} else if (j + c.display_width == offset + 1) {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("<");
set_colors(COLOR_FG, COLOR_BG);
}
j += c.display_width;
i += 1;
}
}
void realign_cursor() {
line_t * line = env->lines[env->line_no-1];
int x = -env->coffset;
int i = 0;
for (; i < env->col_no - 1; ++i) {
if (x + 12 > term_width) {
env->col_no = i + 1;
return;
}
char_t * c = &env->lines[env->line_no-1]->text[i];
x += c->display_width;
}
while (x < 0) {
env->col_no += 1;
i++;
char_t * c = &env->lines[env->line_no-1]->text[i];
x += c->display_width;
}
}
void redraw_text() {
int l = term_height - env->bottom_size - 1;
int j = 0;
int num_size = log_base_10(env->line_count) + 2;
for (int x = env->offset; j < l && x < env->line_count; x++) {
place_cursor(1,2 + j);
/* draw line number */
set_colors(COLOR_NUMBER_FG, COLOR_ALT_FG);
printf(" ");
set_colors(COLOR_NUMBER_FG, COLOR_NUMBER_BG);
for (int y = 0; y < num_size - log_base_10(x + 1); ++y) {
printf(" ");
}
printf("%d ", x + 1);
set_colors(COLOR_FG, COLOR_BG);
clear_to_end();
render_line(env->lines[x], term_width - 3 - num_size, env->coffset);
j++;
}
for (; j < l; ++j) {
place_cursor(1,2 + j);
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("~");
clear_to_end();
}
}
void redraw_statusbar() {
place_cursor(1, term_height - 1);
set_colors(COLOR_FG, COLOR_STATUS_BG);
if (env->file_name) {
printf("%s", env->file_name);
} else {
printf("[No Name]");
}
if (env->modified) {
printf(" [+]");
}
clear_to_end();
char right_hand[1024];
sprintf(right_hand, "Line %d/%d Col: %d ", env->line_no, env->line_count, env->col_no);
place_cursor_h(term_width - strlen(right_hand));
printf("%s",right_hand);
fflush(stdout);
}
void redraw_commandline() {
place_cursor(1, term_height);
set_colors(COLOR_FG, COLOR_BG);
clear_to_end();
}
void redraw_all() {
redraw_tabbar();
redraw_text();
redraw_statusbar();
redraw_commandline();
}
void update_title() {
char cwd[1024] = {'/',0};
#ifdef __linux__
getcwd(cwd, 1024);
#else
syscall_getcwd(cwd, 1024);
#endif
printf("\033]1;%s%s (%s) - BIM\007", env->file_name, env->modified ? " +" : "", cwd);
}
void set_modified() {
if (env->modified) return;
update_title();
env->modified = 1;
redraw_tabbar();
redraw_statusbar();
}
void render_error(char * message) {
redraw_commandline();
set_colors(COLOR_ERROR_FG, COLOR_ERROR_BG);
printf("%s", message);
fflush(stdout);
}
void render_cursor() {
printf("\033[1z");
fflush(stdout);
}
void place_cursor_actual() {
int num_size = log_base_10(env->line_count) + 5;
int x = num_size + 1 - env->coffset;
for (int i = 0; i < env->col_no - 1; ++i) {
char_t * c = &env->lines[env->line_no-1]->text[i];
x += c->display_width;
}
int y = env->line_no - env->offset + 1;
place_cursor(x,y);
csr_x_actual = x;
csr_y_actual = y;
#ifndef __linux__
render_cursor();
#endif
}
void initialize() {
buffers_avail = 4;
buffers = malloc(sizeof(buffer_t *) * buffers_avail);
#ifdef __linux__
struct winsize w;
ioctl(0, TIOCGWINSZ, &w);
term_width = w.ws_col;
term_height = w.ws_row;
#else
printf("\033[1003z");
fflush(stdout);
scanf("%d,%d", &term_width, &term_height);
fpurge(stdin);
#endif
set_unbuffered();
}
void goto_line(int line) {
if (line < 1) line = 1;
if (line > env->line_count) line = env->line_count;
env->offset = line - 1;
env->line_no = line;
env->col_no = 1;
redraw_all();
}
void add_buffer(uint8_t * buf, int size) {
for (int i = 0; i < size; ++i) {
if (!decode(&state, &codepoint_r, buf[i])) {
uint32_t c = codepoint_r;
if (c == '\n') {
env->lines = add_line(env->lines, env->line_no);
env->col_no = 1;
env->line_no += 1;
} else {
char_t _c;
_c.codepoint = (uint16_t)c;
_c.display_width = codepoint_width((uint16_t)c);
line_t * line = env->lines[env->line_no - 1];
line_t * nline = line_insert(line, _c, env->col_no - 1);
if (line != nline) {
env->lines[env->line_no - 1] = nline;
}
env->col_no += 1;
}
} else if (state == UTF8_REJECT) {
state = 0;
}
}
}
void open_file(char * file) {
env = buffer_new();
env->file_name = malloc(strlen(file) + 1);
memcpy(env->file_name, file, strlen(file) + 1);
setup_buffer(env);
FILE * f = fopen(file, "r");
if (!f) {
char buf[1024];
snprintf(buf, 1204, "Could not open %s", file);
render_error(buf);
return;
}
size_t length;
fseek(f, 0, SEEK_END);
length = ftell(f);
fseek(f, 0, SEEK_SET);
uint8_t buf[BLOCK_SIZE];
while (length > BLOCK_SIZE) {
fread(buf, BLOCK_SIZE, 1, f);
add_buffer(buf, BLOCK_SIZE);
length -= BLOCK_SIZE;
}
if (length > 0) {
fread(buf, 1, length, f);
add_buffer((uint8_t *)buf, length);
}
update_title();
goto_line(0);
fclose(f);
}
void quit() {
set_buffered();
reset();
clear_screen();
printf("Thanks for flying bim!\n");
exit(0);
}
void try_quit() {
for (uint32_t i = 0; i < buffers_len; i++ ) {
buffer_t * _env = buffers[i];
if (_env->modified) {
char msg[100];
snprintf(msg, 100, "Modifications made to file `%s` in tab %d. Aborting.", _env->file_name, i+1);
render_error(msg);
return;
}
}
quit();
}
void previous_tab() {
buffer_t * last = NULL;
for (uint32_t i = 0; i < buffers_len; i++) {
buffer_t * _env = buffers[i];
if (_env == env) {
if (last) {
env = last;
redraw_all();
return;
} else {
env = buffers[buffers_len-1];
redraw_all();
return;
}
}
last = _env;
}
}
void next_tab() {
for (uint32_t i = 0; i < buffers_len; i++) {
buffer_t * _env = buffers[i];
if (_env == env) {
if (i != buffers_len - 1) {
env = buffers[i+1];
redraw_all();
return;
} else {
env = buffers[0];
redraw_all();
return;
}
}
}
}
int isnumeric(char * str) {
char *p = str;
while (*p) {
if (*p < '0' || *p > '9') return 0;
++p;
}
return 1;
}
void write_file(char * file) {
if (!file) {
render_error("Need a file to write to.");
return;
}
FILE * f = fopen(file, "w");
if (!f) {
render_error("Failed to open file for writing.");
}
uint32_t i, j;
for (i = 0; i < env->line_count; ++i) {
line_t * line = env->lines[i];
for (j = 0; j < line->actual; j++) {
char_t c = line->text[j];
if (c.codepoint == 0) {
char buf[1] = {0};
fwrite(buf, 1, 1, f);
} else {
char tmp[4];
int i = to_eight(c.codepoint, tmp);
fwrite(tmp, i, 1, f);
}
}
if (i + 1 < env->line_count) {
fputc('\n', f);
}
}
fclose(f);
env->modified = 0;
if (!env->file_name) {
env->file_name = malloc(strlen(file) + 1);
memcpy(env->file_name, file, strlen(file) + 1);
}
redraw_all();
}
void process_command(char * cmd) {
char *p, *argv[512], *last;
int argc = 0;
for ((p = strtok_r(cmd, " ", &last)); p;
(p = strtok_r(NULL, " ", &last)), argc++) {
if (argc < 511) argv[argc] = p;
}
argv[argc] = NULL;
if (argc < 1) {
/* no op */
return;
}
if (!strcmp(argv[0], "e")) {
if (argc > 1) {
open_file(argv[1]);
} else {
render_error("Expected a file to open...");
}
} else if (!strcmp(argv[0], "w")) {
if (argc > 1) {
write_file(argv[1]);
} else {
write_file(env->file_name);
}
} else if (!strcmp(argv[0], "q")) {
if (env->modified) {
render_error("No write since last change. Use :q! to force exit.");
} else {
buffer_t * previous_env = env;
buffer_t * new_env = buffer_close(env);
if (new_env == previous_env) {
render_error("lolwat");
}
if (!new_env) {
quit();
}
free(previous_env);
env = new_env;
redraw_all();
}
} else if (!strcmp(argv[0], "qall")) {
try_quit();
} else if (!strcmp(argv[0], "q!")) {
quit();
} else if (!strcmp(argv[0], "tabp")) {
previous_tab();
} else if (!strcmp(argv[0], "tabn")) {
next_tab();
} else if (isnumeric(argv[0])) {
goto_line(atoi(argv[0]));
} else {
char buf[512];
snprintf(buf, 512, "Not an editor command: %s", argv[0]);
render_error(buf);
}
}
void command_mode() {
char c;
char buffer[1024] = {0};
int buffer_len = 0;
redraw_commandline();
printf(":");
fflush(stdout);
while (c = fgetc(stdin)) {
if (c == '\033') {
break;
} else if (c == ENTER_KEY) {
process_command(buffer);
break;
} else if (c == BACKSPACE_KEY) {
if (buffer_len > 0) {
buffer_len -= 1;
buffer[buffer_len] = '\0';
redraw_commandline();
printf(":%s", buffer);
fflush(stdout);
} else {
redraw_commandline();
break;
}
} else {
buffer[buffer_len] = c;
buffer_len++;
printf("%c", c);
fflush(stdout);
}
}
}
void insert_mode() {
uint8_t cin;
uint32_t c;
redraw_commandline();
set_bold();
printf("-- INSERT --");
reset();
place_cursor_actual();
set_colors(COLOR_FG, COLOR_BG);
while (cin = fgetc(stdin)) {
if (!decode(&istate, &c, cin)) {
switch (c) {
case '\033':
if (env->col_no > env->lines[env->line_no-1]->actual) {
env->col_no = env->lines[env->line_no-1]->actual;
}
if (env->col_no == 0) env->col_no = 1;
redraw_commandline();
return;
case BACKSPACE_KEY:
if (env->col_no > 1) {
line_delete(env->lines[env->line_no - 1], env->col_no - 1);
env->col_no -= 1;
redraw_text();
set_modified();
redraw_statusbar();
place_cursor_actual();
}
break;
case ENTER_KEY:
if (env->col_no == env->lines[env->line_no - 1]->actual + 1) {
env->lines = add_line(env->lines, env->line_no);
} else {
/* oh oh god we're all gonna die */
env->lines = split_line(env->lines, env->line_no, env->col_no - 1);
}
env->col_no = 1;
env->line_no += 1;
if (env->line_no > env->offset + term_height - env->bottom_size - 1) {
env->offset += 1;
}
redraw_text();
set_modified();
redraw_statusbar();
place_cursor_actual();
break;
default:
{
char_t _c;
_c.codepoint = c;
_c.display_width = codepoint_width(c);
line_t * line = env->lines[env->line_no - 1];
line_t * nline = line_insert(line, _c, env->col_no - 1);
if (line != nline) {
env->lines[env->line_no - 1] = nline;
}
redraw_text(); /* XXX */
env->col_no += 1;
set_modified();
redraw_statusbar();
place_cursor_actual();
}
break;
}
} else if (istate == UTF8_REJECT) {
istate = 0;
}
}
}
int main(int argc, char * argv[]) {
initialize();
if (argc > 1) {
open_file(argv[1]);
} else {
env = buffer_new();
update_title();
setup_buffer(env);
}
while (1) {
redraw_all();
place_cursor_actual();
char buf[1];
char c;
while (c = fgetc(stdin)) {
switch (c) {
case '\033':
redraw_all();
break;
case ':':
/* Switch to command mode */
command_mode();
break;
case 'j':
if (env->line_no < env->line_count) {
env->line_no += 1;
if (env->col_no > env->lines[env->line_no-1]->actual) {
env->col_no = env->lines[env->line_no-1]->actual;
}
if (env->col_no == 0) env->col_no = 1;
if (env->line_no > env->offset + term_height - env->bottom_size - 1) {
env->offset += 1;
redraw_text();
}
redraw_statusbar();
place_cursor_actual();
}
break;
case 'k':
if (env->line_no > 1) {
env->line_no -= 1;
if (env->col_no > env->lines[env->line_no-1]->actual) {
env->col_no = env->lines[env->line_no-1]->actual;
}
if (env->col_no == 0) env->col_no = 1;
if (env->line_no <= env->offset) {
env->offset -= 1;
redraw_text();
}
redraw_statusbar();
place_cursor_actual();
}
break;
case 'h':
if (env->col_no > 1) {
env->col_no -= 1;
redraw_statusbar();
place_cursor_actual();
}
break;
case 'l':
if (env->col_no < env->lines[env->line_no-1]->actual) {
env->col_no += 1;
redraw_statusbar();
place_cursor_actual();
}
break;
case ' ':
goto_line(env->line_no + term_height - 6);
break;
case 'O':
{
env->lines = add_line(env->lines, env->line_no-1);
env->col_no = 1;
redraw_text();
set_modified();
place_cursor_actual();
goto _insert;
}
case 'o':
{
env->lines = add_line(env->lines, env->line_no);
env->col_no = 1;
env->line_no += 1;
if (env->line_no > env->offset + term_height - env->bottom_size - 1) {
env->offset += 1;
}
redraw_text();
set_modified();
place_cursor_actual();
goto _insert;
}
case ',':
if (env->coffset > 5) {
env->coffset -= 5;
} else {
env->coffset = 0;
}
realign_cursor();
redraw_all();
break;
case '.':
env->coffset += 5;
realign_cursor();
redraw_all();
break;
case 'a':
if (env->col_no < env->lines[env->line_no-1]->actual + 1) {
env->col_no += 1;
}
goto _insert;
case '$':
env->col_no = env->lines[env->line_no-1]->actual+1;
break;
case '0':
env->col_no = 1;
break;
case 'i':
_insert:
insert_mode();
break;
default:
break;
}
place_cursor_actual();
}
_continue:
printf("%c", c);
}
#if 0
if (argc < 2) {
fprintf(stderr, "%s: argument expected\n", argv[0]);
return 1;
}
fprintf(stderr, "Writing out file again:\n\n");
for (int i = 0; i < file_len_unicode; ++i) {
uint8_t buf[4];
int len = to_eight(file_buffer[i], buf);
fwrite(buf, len, 1, stdout);
}
fflush(stdout);
#endif
return 0;
}
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