diff options
Diffstat (limited to 'input.c')
| -rw-r--r-- | input.c | 169 |
1 files changed, 169 insertions, 0 deletions
@@ -0,0 +1,169 @@ +#include "input.h" + +#include <stdlib.h> +#include <errno.h> +#include <unistd.h> + +#include "file.h" +#include "terminal.h" +#include "row.h" + +int editor_read_key() +{ + int read_count; + char c; + + while ((read_count = read(STDIN_FILENO, &c, 1)) != 1) { + if (read_count == -1 && errno != EAGAIN) + die("read"); + } + + if (c == '\x1b') { + char seq[3]; + + if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b'; + if (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 '1': return HOME_KEY; + case '3': return DELETE_KEY; + case '4': return END_KEY; + case '5': return PAGE_UP; + case '6': return PAGE_DOWN; + case '7': return HOME_KEY; + case '8': return END_KEY; + } + } + } else { + switch (seq[1]) { + case 'A': return ARROW_UP; + case 'B': return ARROW_DOWN; + case 'C': return ARROW_RIGHT; + case 'D': return ARROW_LEFT; + case 'H': return HOME_KEY; + case 'F': return END_KEY; + } + } + } else if (seq[0] == 'O') { + switch (seq[1]) { + case 'H': return HOME_KEY; + case 'F': return END_KEY; + } + } + return '\x1b'; + } else { + return c; + } +} + +void editor_move_cursor(struct editor_state* editor, int key) +{ + struct editor_row* row = (editor->cursor_y >= editor->row_count) ? NULL : &editor->rows[editor->cursor_y]; + + switch (key) { + case ARROW_LEFT: + if (editor->cursor_x != 0) { + editor->cursor_x--; + } else if (editor->cursor_y > 0) { + editor->cursor_y--; + editor->cursor_x = editor->rows[editor->cursor_y].size; + } + break; + case ARROW_RIGHT: + if (row && editor->cursor_x < row->size) { + editor->cursor_x++; + } else if (row && editor->cursor_x == row->size) { + editor->cursor_y++; + editor->cursor_x = 0; + } + break; + case ARROW_UP: + if (editor->cursor_y != 0) editor->cursor_y--; + break; + case ARROW_DOWN: + if (editor->cursor_y != editor->row_count - 1) editor->cursor_y++; + break; + } + + row = (editor->cursor_y >= editor->row_count) ? NULL : &editor->rows[editor->cursor_y]; + int row_length = row ? row->size : 0; + if (editor->cursor_x > row_length) + editor->cursor_x = row_length; +} + +void editor_process_keypress(struct editor_state* editor) +{ + static int quit_message = 1; + int c = editor_read_key(); + + switch (c) { + case '\r': + editor_insert_newline(editor); + break; + case CTRL_KEY('q'): + if (editor->dirty && quit_message) { + editor_set_status_message(editor, "This file has unsaved changes. Press Ctrl+Q again to quit"); + quit_message = 0; + return; + } + write(STDOUT_FILENO, "\x1b[2J", 4); + write(STDOUT_FILENO, "\x1b[H", 3); + exit(0); + break; + case CTRL_KEY('s'): + editor_save(editor); + break; + case HOME_KEY: + editor->cursor_x = 0; + break; + case END_KEY: + if (editor->cursor_y < editor->row_count) + editor->cursor_x = editor->rows[editor->cursor_y].size; + break; + case CTRL_KEY('f'): + editor_find(editor); + break; + case BACKSPACE: + case DELETE_KEY: + if (c == DELETE_KEY) + editor_move_cursor(editor, ARROW_RIGHT); + editor_delete_char(editor); + break; + case PAGE_UP: + case PAGE_DOWN: + { + if (c == PAGE_UP) { + editor->cursor_y = editor->row_offset; + } else { + editor->cursor_y = editor->row_offset + editor->screen_rows -1; + if (editor->cursor_y > editor->row_count) + editor->cursor_y = editor->row_count; + } + + int times = editor->screen_rows; + while (times--) + editor_move_cursor(editor, c == PAGE_UP ? ARROW_UP : ARROW_DOWN); + } + break; + case ARROW_UP: + case ARROW_DOWN: + case ARROW_LEFT: + case ARROW_RIGHT: + editor_move_cursor(editor, c); + break; + case CTRL_KEY('l'): + case '\x1b': + break; + default: + editor_insert_char(editor, c); + break; + } + + quit_message = 1; +} |