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Copy pathconsole.c
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296 lines (245 loc) · 7.07 KB
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#include "console.h"
#include "list.h"
#include <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unicode/utext.h>
#include <unicode/ubrk.h>
struct imv_console {
char *buffer;
size_t buffer_len;
size_t cursor;
imv_console_callback callback;
void *callback_data;
struct list *history;
ssize_t history_item; /* -1 when not traversing history */
char *history_before; /* contents of line before history was opened */
};
/* Iterates forwards over characters in a UTF-8 string */
static size_t next_char(char *buffer, size_t position)
{
size_t result = position;
UErrorCode status = U_ZERO_ERROR;
UText *ut = utext_openUTF8(NULL, buffer, -1, &status);
UBreakIterator *it = ubrk_open(UBRK_CHARACTER, NULL, NULL, 0, &status);
ubrk_setUText(it, ut, &status);
int boundary = ubrk_following(it, (int)position);
if (boundary != UBRK_DONE) {
result = (size_t)boundary;
}
ubrk_close(it);
utext_close(ut);
assert(U_SUCCESS(status));
return result;
}
/* Iterates backwards over characters in a UTF-8 string */
static size_t prev_char(char *buffer, size_t position)
{
size_t result = position;
UErrorCode status = U_ZERO_ERROR;
UText *ut = utext_openUTF8(NULL, buffer, -1, &status);
UBreakIterator *it = ubrk_open(UBRK_CHARACTER, NULL, NULL, 0, &status);
ubrk_setUText(it, ut, &status);
int boundary = ubrk_preceding(it, (int)position);
if (boundary != UBRK_DONE) {
result = (size_t)boundary;
}
ubrk_close(it);
utext_close(ut);
assert(U_SUCCESS(status));
return result;
}
static void add_to_history(struct list *history, const char *line)
{
/* Don't add blank lines */
if (line[0] == '\0') {
return;
}
/* Don't add the same line consecutively */
if (history->len > 0 && !strcmp(history->items[history->len - 1], line)) {
return;
}
list_append(history, strdup(line));
}
static void history_back(struct imv_console *console)
{
if (console->history->len < 1) {
/* No history to browse */
return;
}
if (console->history_item == 0) {
/* At the top of history. Do nothing. */
return;
}
if (console->history_item == -1) {
/* Enter history from the bottom */
free(console->history_before);
console->history_before = strdup(console->buffer);
console->history_item = console->history->len - 1;
} else {
/* Move back in history */
console->history_item--;
}
strncpy(console->buffer,
console->history->items[console->history_item],
console->buffer_len);
console->cursor = strlen(console->buffer);
}
static void history_forward(struct imv_console *console)
{
if (console->history_item == -1) {
/* Not in history, do nothing */
return;
}
if ((size_t)console->history_item == console->history->len - 1) {
/* At the end of history, restore the backup */
strncpy(console->buffer, console->history_before, console->buffer_len);
console->cursor = strlen(console->buffer);
free(console->history_before);
console->history_before = NULL;
console->history_item = -1;
} else {
/* Move forward in history */
console->history_item++;
strncpy(console->buffer,
console->history->items[console->history_item],
console->buffer_len);
console->cursor = strlen(console->buffer);
}
}
struct imv_console *imv_console_create(void)
{
struct imv_console *console = calloc(1, sizeof *console);
console->buffer_len = 1024;
console->history_item = -1;
console->history = list_create();
return console;
}
void imv_console_free(struct imv_console *console)
{
free(console->buffer);
list_deep_free(console->history);
free(console->history_before);
free(console);
}
void imv_console_set_command_callback(struct imv_console *console,
imv_console_callback callback, void *data)
{
console->callback = callback;
console->callback_data = data;
}
bool imv_console_is_active(struct imv_console *console)
{
return console->buffer != NULL;
}
void imv_console_activate(struct imv_console *console)
{
if (console->buffer) {
return;
}
console->buffer = calloc(1, console->buffer_len);
console->cursor = 0;
console->history_item = -1;
}
void imv_console_input(struct imv_console *console, const char *text)
{
if (!console || !console->buffer) {
return;
}
/* Don't allow newlines or control characters. */
if (*text == '\n' || iscntrl(*text)) {
return;
}
/* Increase buffer size if needed */
if (strlen(text) + strlen(console->buffer) + 1 > console->buffer_len) {
console->buffer_len *= 2;
console->buffer = realloc(console->buffer, console->buffer_len);
assert(console->buffer);
}
/* memmove over everything after the cursor right then copy in the new bytes */
size_t to_insert = strlen(text);
size_t old_cursor = console->cursor;
size_t new_cursor = console->cursor + to_insert;
size_t to_shift = strlen(console->buffer) - old_cursor;
memmove(&console->buffer[new_cursor], &console->buffer[old_cursor], to_shift);
memcpy(&console->buffer[old_cursor], text, to_insert);
console->cursor = new_cursor;
}
bool imv_console_key(struct imv_console *console, const char *key)
{
if (!console || !console->buffer) {
return false;
}
if (!strcmp("Escape", key)) {
free(console->buffer);
console->buffer = NULL;
return true;
}
if (!strcmp("Return", key)) {
if (console->callback) {
console->callback(console->buffer, console->callback_data);
}
add_to_history(console->history, console->buffer);
free(console->buffer);
console->buffer = NULL;
return true;
}
if (!strcmp("Left", key) || !strcmp("Ctrl+b", key)) {
console->cursor = prev_char(console->buffer, console->cursor);
return true;
}
if (!strcmp("Right", key) || !strcmp("Ctrl+f", key)) {
console->cursor = next_char(console->buffer, console->cursor);
return true;
}
if (!strcmp("Up", key) || !strcmp("Ctrl+p", key)) {
history_back(console);
return true;
}
if (!strcmp("Down", key) || !strcmp("Ctrl+n", key)) {
history_forward(console);
return true;
}
if (!strcmp("Ctrl+a", key)) {
console->cursor = 0;
return true;
}
if (!strcmp("Ctrl+e", key)) {
console->cursor = strlen(console->buffer);
return true;
}
if (!strcmp("BackSpace", key)) {
/* memmove eve
5258
rything after the cursor left */
size_t new_cursor = prev_char(console->buffer, console->cursor);
size_t old_cursor = console->cursor;
size_t to_shift = strlen(console->buffer) - new_cursor;
memmove(&console->buffer[new_cursor], &console->buffer[old_cursor], to_shift);
console->cursor = new_cursor;
return true;
}
return false;
}
const char *imv_console_prompt(struct imv_console *console)
{
return console->buffer;
}
size_t imv_console_prompt_cursor(struct imv_console *console)
{
return console->cursor;
}
const char *imv_console_backlog(struct imv_console *console)
{
(void)console;
return NULL;
}
void imv_console_write(struct imv_console *console, const char *text)
{
(void)console;
(void)text;
}
void imv_console_add_completion(struct imv_console *console, const char *template)
{
(void)console;
(void)template;
}