commit c88b19a4dae57093c57ff17edc2117b2cb3bad8f Author: sloumdrone Date: Fri Dec 27 22:26:00 2019 -0800 Initial commit diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..922d4ac --- /dev/null +++ b/Makefile @@ -0,0 +1,2 @@ +csedit: csedit.c + $(CC) csedit.c -o csedit -Wall -Wextra -pedantic -std=c99 diff --git a/csedit b/csedit new file mode 100755 index 0000000..21523fd Binary files /dev/null and b/csedit differ diff --git a/csedit.c b/csedit.c new file mode 100644 index 0000000..9944533 --- /dev/null +++ b/csedit.c @@ -0,0 +1,309 @@ +// +// includes +// -------- +#include +#include +#include +#include +#include +#include +#include +#include + +// +// definitions +// ----------- +#define CSEDIT_VERSION "0.0.1" +#define CTRL_KEY(k) ((k) & 0x1f) + +enum editorMode {CommandMode, InputMode, VisualMode}; +enum editorKey { + ARROW_LEFT = 1000, + ARROW_RIGHT, + ARROW_UP, + ARROW_DOWN, + PAGE_UP, + PAGE_DOWN, + DELETE, + BACKSPACE +}; + +// +// data +// ---- + +struct editorConfig { + struct termios orig_termios; + enum editorMode mode; + int cx, cy; + int screenRows; + int screenCols; +}; + +struct editorConfig E; + +// +// terminal +// -------- +void die(const char *s) { + write(STDOUT_FILENO, "\033[2J", 4); + write(STDOUT_FILENO, "\033[H", 3); + perror(s); + write(STDOUT_FILENO, "\r", 1); + exit(1); +} + +void quit() { + write(STDOUT_FILENO, "\033[2J", 4); + write(STDOUT_FILENO, "\033[H", 3); + exit(0); +} + +void disableRawMode() { + if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1) + die("tcsetattr"); +} + +void enableRawMode() { + if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1) die("tcgetattr"); + atexit(disableRawMode); + + struct termios raw = E.orig_termios; + raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON); + raw.c_oflag &= ~(OPOST); + raw.c_cflag |= ~(CS8); + raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG); + raw.c_cc[VMIN] = 0; + raw.c_cc[VTIME] = 1; + + if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr"); +} + +int editorReadKey() { + int nread; + char c; + while ((nread = read(STDIN_FILENO, &c, 1)) != 1) { + if (nread == -1 && errno != EAGAIN) die("read"); + } + + if (c == '\033') { + char seq[3]; + + if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\033'; + if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\033'; + if (seq[0] == '[') { + switch (seq[1]) { + case 'A': return ARROW_UP; + case 'B': return ARROW_DOWN; + case 'C': return ARROW_RIGHT; + case 'D': return ARROW_LEFT; + } + } + return '\033'; + } + return c; +} + +int getCursorPosition(int *rows, int *cols) { + char buf[32]; + unsigned int i = 0; + + if (write(STDOUT_FILENO, "\033[6n", 4) != 4) return -1; + printf("\r\n"); + + while (i < sizeof(buf) - 1) { + if (read(STDIN_FILENO, &buf[i], 1) != 1) break; + if (buf[i] == 'R') break; + i++; + } + buf[i] = '\0'; + if (buf[0] != '\033' || buf[1] != '[') return -1; + if (scanf(&buf[2], "%d;%d", rows, cols) != 2) return -1; + return 0; +} + +int getWindowSize(int *rows, int *cols) { + struct winsize ws; + + if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) { + if (write(STDOUT_FILENO, "\033[999C\033[999B", 12) != 12) return -1; + return getCursorPosition(rows, cols); + } + + *cols = ws.ws_col; + *rows = ws.ws_row; + return 0; +} + +// +// append buffer +// ------------- +struct abuf { + char *b; + int len; +}; + +#define ABUF_INIT {NULL, 0} + +void abAppend(struct abuf *ab, const char *s, int len) { + char *new = realloc(ab->b, ab->len + len); + + 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 +// ------ +void editorDrawRows(struct abuf *ab) { + int y; + for (y = 0; y < E.screenRows; y++) { + if (y == E.screenRows / 3) { + char welcome[80]; + int welcomelen = snprintf(welcome, sizeof(welcome), "[ cs edit ] - version %s", CSEDIT_VERSION); + if (welcomelen > E.screenCols) welcomelen = E.screenCols; + int padding = (E.screenCols - welcomelen) / 2; + if (padding) { + abAppend(ab, "~", 1); + padding--; + } + while (padding--) abAppend(ab, " ", 1); + abAppend(ab, welcome, welcomelen); + } else { + abAppend(ab, "~", 1); + } + + abAppend(ab, "\033[K", 3); + + if (y < E.screenRows - 1) { + abAppend(ab, "\r\n", 2); + } + } +} + +void editorRefreshScreen() { + struct abuf ab = ABUF_INIT; + + abAppend(&ab, "\033[?25l", 6); + abAppend(&ab, "\033[H", 3); + editorDrawRows(&ab); + + char buf[32]; + snprintf(buf, sizeof(buf), "\033[%d;%dH", E.cy + 1, E.cx + 1); + abAppend(&ab, buf, strlen(buf)); + + abAppend(&ab, "\033[?25h", 6); + + write(STDOUT_FILENO, ab.b, ab.len); + abFree(&ab); +} + +// +// input +// ----- +void editorMoveCursor(int key) { + switch (key) { + case 'j': + case ARROW_DOWN: + if (E.cy != E.screenRows - 1) { + E.cy++; + } + break; + case 'k': + case ARROW_UP: + if (E.cy != 0) { + E.cy--; + } + break; + case 'h': + case ARROW_LEFT: + if (E.cx != 0) { + E.cx--; + } + break; + case 'l': + case ARROW_RIGHT: + if (E.cx != E.screenCols - 1) { + E.cx++; + } + break; + } +} + +void editorInputKp(int c) { + switch (c) { + case ARROW_DOWN: + case ARROW_UP: + case ARROW_LEFT: + case ARROW_RIGHT: + editorMoveCursor(c); + break; + case '\033': + E.mode = CommandMode; + default: + break; + } +} + +void editorCommandKp(int c) { + switch (c) { + case 'q': + quit(); + break; + case 'j': + case 'k': + case 'h': + case 'l': + case ARROW_DOWN: + case ARROW_UP: + case ARROW_LEFT: + case ARROW_RIGHT: + editorMoveCursor(c); + break; + case 'i': + E.mode = InputMode; + } + +} + +void editorProcessKeypress() { + int c = editorReadKey(); + switch (c) { + case CTRL_KEY('q'): + quit(); + break; + } + + if (E.mode == CommandMode) { + editorCommandKp(c); + } else { + editorInputKp(c); + } +} + +// +// init +// ---- +void initEditor() { + E.mode = CommandMode; + E.cx = 0; + E.cy = 0; + if (getWindowSize(&E.screenRows, &E.screenCols) == -1) die("getWindowSize"); +} + +int main() { + enableRawMode(); + initEditor(); + + while (1) { + editorRefreshScreen(); + editorProcessKeypress(); + } + return 0; +}