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moving on screen

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This commit is contained in:
Arthur Barraux
2024-09-22 15:05:21 +02:00
parent 868616b384
commit ca215da58e
3 changed files with 170 additions and 41 deletions
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Makefile
+2 -2
View File
@@ -10,7 +10,7 @@ BUILD_DIR=build
BUILD_FLAGS=-Wall -Wextra -pedantic
build: main.c main.h
build: main.c
if [ ! -d beluga-output ]; then mkdir beluga-output; fi
if [ ! -d beluga-output/build ]; then mkdir beluga-output/build; fi
$(CC) main.c -o $(BELUGA_OUTPUT)/$(BUILD_DIR)/beluga $(BUILD_FLAGS)
@@ -20,7 +20,7 @@ DEBUG_DIR=debug
DEBUG_FLAGS=-Wall -Wextra -pedantic -Werror -fsanitize=address,undefined -g
debug: main.c main.h
debug: main.c
if [ ! -d beluga-output ]; then mkdir beluga-output; fi
if [ ! -d beluga-output/debug ]; then mkdir beluga-output/debug; fi
$(CC) main.c -o $(BELUGA_OUTPUT)/$(DEBUG_DIR)/beluga $(DEBUG_FLAGS)
main.c
+167 -21
View File
@@ -5,19 +5,36 @@
* interactions. \version 0.1 \date 21 septembre 2024
*/
#include "main.h"
#include <asm-generic/ioctls.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
/* defines */
#define BELUGA_VERSION "0.1"
#define CTRL_KEY(k) ((k) & 0x1f)
#define CURSOR_TOP_LEFT "\x1b[H"
#define HIDE_CURSOR "\x1b[?25l"
#define SHOW_CURSOR "\x1b[?25h"
#define ERASE_END_LINE "\x1b[K"
#define ABUF_INIT {NULL, 0}
enum editorKey {
CURSOR_UP = 1000,
CURSOR_DOWN,
CURSOR_LEFT,
CURSOR_RIGHT,
PAGE_UP,
PAGE_DOWN
};
/* data */
/**
@@ -25,11 +42,17 @@
* \brief Containing our editor state.
*/
struct editorConfig {
int cursor_x, cursor_y;
int screenrows;
int screencols;
struct termios orig_termios;
};
struct abuf {
char *b;
int len;
};
struct editorConfig E;
/* terminal */
@@ -40,7 +63,8 @@ struct editorConfig E;
* \param *s Error string
* */
void die(const char *s) {
wipeScreen();
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, CURSOR_TOP_LEFT, 3);
perror(s);
exit(1);
}
@@ -70,16 +94,53 @@ void enableRawMode() {
}
}
char editorReadKey() {
int editorReadKey() {
int nread;
char c;
char seq[3];
while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
if (nread == -1 && errno != EAGAIN) {
die("read");
}
}
if (c == '\x1b') {
if (read(STDIN_FILENO, &seq[0], 1) != 1 ||
read(STDIN_FILENO, &seq[1], 1) != 1) {
return '\x1b';
}
if (seq[0] == '[') {
if (seq[1] >= '0' && seq[1] <= '9') {
if (read(STDIN_FILENO, &seq[2], 1) != 1) {
return '\x1b';
}
if (seq[2] == '~') {
switch (seq[1]) {
case '5':
return PAGE_UP;
case '6':
return PAGE_DOWN;
}
}
} else {
switch (seq[1]) {
case 'A':
return CURSOR_UP;
case 'B':
return CURSOR_DOWN;
case 'C':
return CURSOR_LEFT;
case 'D':
return CURSOR_RIGHT;
}
}
}
return '\x1b';
} else {
return c;
}
}
int getCursorPosition(int *rows, int *cols) {
char buf[32];
@@ -125,34 +186,74 @@ int getWindowSize(int *rows, int *cols) {
}
}
/* output */
/* append buffer */
void abAppend(struct abuf *ab, const char *s, int len) {
char *new = realloc(ab->b, ab->len + len);
/** \fn void wipeScreen()
* \brief Wipe the terminal screen and put the cursor on the top left corner.
* */
void wipeScreen() {
/* Clear the screen */
write(STDOUT_FILENO, "\x1b[2J", 4);
/* Put the cursor at the top left corner */
write(STDOUT_FILENO, CURSOR_TOP_LEFT, 3);
if (new == NULL) {
return;
}
memcpy(&new[ab->len], s, len);
ab->b = new;
ab->len += len;
}
void abFree(struct abuf *ab) { free(ab->b); }
/* output */
/**
* \fn void editorDrawRows()
* \fn void editorDrawRows(struct abuf *ab)
* \brief Draws left rows of the editor.
*/
void editorDrawRows() {
void editorDrawRows(struct abuf *ab) {
int y;
char welcome[80];
int welcome_len;
int padding;
for (y = 0; y < E.screenrows; ++y) {
write(STDOUT_FILENO, "~\r\n", 3);
if (y == E.screenrows / 3) {
welcome_len =
snprintf(welcome, sizeof(welcome), "Beluga text editor -- version %s",
BELUGA_VERSION);
if (welcome_len > E.screencols) {
welcome_len = E.screencols;
}
padding = (E.screencols - welcome_len) / 2;
if (padding) {
abAppend(ab, "~", 1);
--padding;
}
while (padding--) {
abAppend(ab, " ", 1);
}
abAppend(ab, welcome, welcome_len);
} else {
abAppend(ab, "~", 1);
}
abAppend(ab, ERASE_END_LINE, 3);
if (y < E.screenrows - 1) {
abAppend(ab, "\r\n", 2);
}
}
}
void editorRefreshScreen() {
wipeScreen();
editorDrawRows();
struct abuf ab = ABUF_INIT;
char buf[32];
write(STDOUT_FILENO, CURSOR_TOP_LEFT, 3);
abAppend(&ab, HIDE_CURSOR, 6);
abAppend(&ab, CURSOR_TOP_LEFT, 3);
editorDrawRows(&ab);
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", E.cursor_y + 1, E.cursor_x + 1);
abAppend(&ab, buf, strlen(buf));
abAppend(&ab, SHOW_CURSOR, 6);
write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}
/* input */
@@ -161,14 +262,57 @@ void editorRefreshScreen() {
* \fn void editorProcessKeypress()
* \brief Get the last key input and do the proper action.
*/
void editorMoveCursor(int key) {
switch (key) {
case CURSOR_LEFT:
if (E.cursor_x != 0) {
--E.cursor_x;
}
break;
case CURSOR_DOWN:
if (E.cursor_x != E.screencols - 1) {
++E.cursor_y;
}
break;
case CURSOR_UP:
if (E.cursor_y != 0) {
--E.cursor_y;
}
break;
case CURSOR_RIGHT:
if (E.cursor_y != E.screenrows - 1) {
++E.cursor_x;
}
break;
}
}
void editorProcessKeypress() {
char c = editorReadKey();
int c = editorReadKey();
int times;
switch (c) {
case CTRL_KEY('q'):
wipeScreen();
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, CURSOR_TOP_LEFT, 3);
exit(0);
break;
case PAGE_UP:
case PAGE_DOWN: {
times = E.screenrows;
while (--times) {
editorMoveCursor(c == PAGE_UP ? CURSOR_UP : CURSOR_DOWN);
}
} break;
case CURSOR_UP:
case CURSOR_DOWN:
case CURSOR_LEFT:
case CURSOR_RIGHT:
editorMoveCursor(c);
break;
}
}
@@ -179,6 +323,8 @@ void editorProcessKeypress() {
* \brief Job's function is to initialize all the fields of editorConfig.
* */
void initEditor() {
E.cursor_x = 0;
E.cursor_y = 0;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) {
die("getWindowSize");
}
main.h
-17
View File
@@ -1,17 +0,0 @@
#ifndef MAIN_H
#define MAIN_H
/* terminal */
void die(const char *s);
void disableRawMode();
void enableRawMode();
char editorReadKey();
/* output */
void wipeScreen();
void editorDrawRows();
void editorRefreshScreen();
/* input */
void editorProcessKeypress();
#endif