FantasyPvP
345 lines
9.8 KiB
C
345 lines
9.8 KiB
C
#include <stdbool.h>
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#include <stdlib.h>
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#include "dynstr.h"
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#include <ncurses.h>
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#define min(x, y) ((x) < (y) ? (x) : (y))
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#define max(x, y) ((x) > (y) ? (x) : (y))
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typedef struct {
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uint32_t lines;
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uint32_t capacity;
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uint32_t buffer_line;
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uint32_t buffer_col;
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uint32_t y_offset;
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uint32_t x_offset;
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bool unsaved_changes;
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bool editmode;
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String_t* buffer;
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String_t* original;
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String_t filename;
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} Editor;
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void add_toolbar(Editor* self) {
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int max_x, max_y;
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getmaxyx(stdscr, max_y, max_x);
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attron(COLOR_PAIR(2));
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// add an entry for the current mode
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move(max_y - 1, 0);
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char mode[9];
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snprintf(mode, 9, "[%6s]", self->editmode ? "Insert" : "Normal");
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addstr(mode);
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// add an entry for the current line and col
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char line_and_col[24];
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snprintf(line_and_col, 24, " [ln: %d, col: %d]", self->buffer_line + 1, self->buffer_col + 1);
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addstr(line_and_col);
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attroff(COLOR_PAIR(2));
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// add an entry for unsaved changes
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attron(COLOR_PAIR(1));
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char unsaved_changes[20];
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snprintf(unsaved_changes, 20, " [%s]", self->unsaved_changes ? "Unsaved Changes!" : "No Changes Yet! ");
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addstr(unsaved_changes);
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attroff(COLOR_PAIR(1));
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}
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void refresh_buffer(Editor* self) {
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move(0, 0);
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clear();
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// get the screen size so we can figure out where to place characters
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int max_x, max_y;
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getmaxyx(stdscr, max_y, max_x);
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max_y--; // Reserve bottom line for toolbar
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// Ensure y_offset is valid
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if (self->buffer_line >= self->y_offset + max_y) {
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self->y_offset = self->buffer_line - max_y + 1;
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}
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if (self->buffer_line < self->y_offset) {
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self->y_offset = self->buffer_line;
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}
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// Display visible lines
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for (size_t i = self->y_offset; i < self->lines && i < self->y_offset + max_y; i++) {
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move(i - self->y_offset, 0);
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// adding the line number
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attron(COLOR_PAIR(1));
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char line_no[6];
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snprintf(line_no, 6, "%-4d]", i + 1);
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addstr(line_no);
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attroff(COLOR_PAIR(1));
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// Only try to display the line if it's within bounds
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if (i < self->lines) {
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// Calculate visible portion of line
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int visible_start = self->x_offset;
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int line_len = str_len(&self->buffer[i]);
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int visible_end = min(line_len, self->x_offset + max_x - 5);
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if (visible_start < line_len) {
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String_t line_segment = str_slice(
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&self->buffer[i],
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visible_start,
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visible_end
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);
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char* data = to_chars(&line_segment);
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addstr(data);
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str_dealloc(&line_segment);
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free(data);
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}
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}
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}
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add_toolbar(self);
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// Ensure cursor position is valid
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int cursor_y = self->buffer_line - self->y_offset;
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int cursor_x = self->buffer_col - self->x_offset + 5;
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// Clamp cursor position to screen bounds
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cursor_y = min(max(cursor_y, 0), max_y - 1);
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cursor_x = min(max(cursor_x, 5), max_x - 1);
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move(cursor_y, cursor_x);
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}
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void move_cursor_on_screen(Editor* editor, int x, int y) {
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int max_x, max_y;
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getmaxyx(stdscr, max_y, max_x);
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max_y--; // Reserve bottom line for toolbar
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max_x -= 5; // Account for line number margin
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// Adjust x_offset if cursor would be off screen
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if (x + 5 >= max_x + editor->x_offset) {
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editor->x_offset = x - max_x + 6;
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}
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if (x < editor->x_offset) {
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editor->x_offset = x;
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}
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// Adjust y_offset if cursor would be off screen
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if (y >= max_y + editor->y_offset) {
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editor->y_offset = y - max_y + 1;
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}
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if (y < editor->y_offset) {
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editor->y_offset = y;
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}
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refresh_buffer(editor);
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}
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void switch_mode(Editor* self) {
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self->editmode = !self->editmode;
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refresh_buffer(self);
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}
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void newline(Editor* self) {
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move(self->buffer_line, 0);
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char line_no[6];
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snprintf(line_no, 6, "%-6d", self->buffer_line + 1);
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// add the line number
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attron(COLOR_PAIR(1));
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addstr(line_no);
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attroff(COLOR_PAIR(1));
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move_cursor_on_screen(self, self->buffer_col, self->buffer_line);
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}
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Editor editor_from(String_t input_string, String_t filename) {
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Editor e;
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e.lines = 0;
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e.buffer_line = 0;
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e.buffer_col = 0;
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e.y_offset = 0;
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e.x_offset = 0;
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e.editmode = false;
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e.unsaved_changes = false;
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e.filename = filename;
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int linenum = 0;
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e.buffer = str_lines(&input_string, &linenum);
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e.lines = (uint32_t)linenum;
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e.capacity = e.lines;
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str_dealloc(&input_string);
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refresh_buffer(&e);
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return e;
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}
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Editor new_editor(String_t filename) {
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return editor_from(str_new(), filename);
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}
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int save_file(Editor* self) {
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char* name = to_chars(&self->filename);
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// writes the content line by line to the file
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FILE* file = fopen(name, "w");
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for (size_t i = 0; i < self->lines; i++) {
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if (str_to_file(&self->buffer[i], file) == -1) {
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free(name);
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fprintf(stderr, "Error writing to file\n");
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return -1;
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}
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}
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free(name);
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fclose(file);
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return 0;
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}
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void move_cursor(Editor* self, int x, int y) {
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if (y != 0
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&& (int)(self->buffer_line) + y >= 0
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&& self->buffer_line + y < self->lines)
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{
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// move the cursor up or down
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self->buffer_line += y;
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int line_width = str_len(&self->buffer[self->buffer_line]);
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if (self->buffer_col > line_width) {
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self->buffer_col = line_width;
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}
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} else if ((int)(self->buffer_col) + x < 0) {
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// moving the cursor off the left hand side of the line
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if ((int)self->buffer_line > 0) {
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self->buffer_line -= 1;
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self->buffer_col = str_len(&self->buffer[self->buffer_line]);
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}
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} else if (x != 0 && self->buffer_line < self->lines) {
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int line_width = str_len(&self->buffer[self->buffer_line]);
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if (self->buffer_col + x > line_width) {
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// moving the cursor off the right hand side of the line
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if (self->buffer_line + 1 < self->lines) {
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self->buffer_col = 0;
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self->buffer_line += 1;
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}
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} else {
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// moving the cursor left or right in any other case
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self->buffer_col += x;
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}
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}
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move_cursor_on_screen(self, self->buffer_col, self->buffer_line);
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}
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void delchar(Editor* self) {
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self->unsaved_changes = true;
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if (self->buffer_col == str_len(&self->buffer[self->buffer_line])) {
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if (self->buffer_line +1 == self->lines) {
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return;
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}
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// obtain string objects that reference the old lines.
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String_t old_curr_line = self->buffer[self->buffer_line];
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String_t old_next_line = self->buffer[self->buffer_line + 1];
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// assign the new line
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self->buffer[self->buffer_line] = str_merge(&self->buffer[self->buffer_line], &self->buffer[self->buffer_line + 1]);
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// deallocate the memory for the old lines
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str_dealloc(&old_curr_line);
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str_dealloc(&old_next_line);
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for (size_t i = self->buffer_line + 2; i < self->lines; i++) {
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self->buffer[i - 1] = self->buffer[i];
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}
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// replace the last line
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self->buffer[self->lines - 1] = str_new();
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self->lines--;
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refresh_buffer(self);
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} else {
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// removes the character from the current line
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str_remove(&self->buffer[self->buffer_line], self->buffer_col);
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delch();
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}
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}
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void pressed_enter(Editor* self) {
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self->unsaved_changes = true;
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// allocate memory immediately since we know a new line is being added
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self->lines++;
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while (self->lines > self->capacity) {
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self->capacity++;
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}
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self->buffer = (String_t*)realloc(self->buffer, sizeof(String_t) * (self->capacity));
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if (self->buffer_line == self->lines -1) {
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// if at end of file add an empty line
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self->buffer[self->lines - 1] = str_new();
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} else {
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// else shift each line downwards including everything past the cursor on the current line
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for (size_t i = self->lines - 1; i > self->buffer_line + 1; i--) {
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self->buffer[i] = self->buffer[i - 1];
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}
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String_t old_line = self->buffer[self->buffer_line];
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self->buffer[self->buffer_line + 1] = str_slice(
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&self->buffer[self->buffer_line],
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self->buffer_col,
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str_len(&self->buffer[self->buffer_line])
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);
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self->buffer[self->buffer_line] = str_slice(
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&self->buffer[self->buffer_line],
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0,
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self->buffer_col
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);
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str_dealloc(&old_line);
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}
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// refresh the screen with the new data
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refresh_buffer(self);
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move_cursor(self, 1, 0);
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}
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// inserts a character at the cursor
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void addchar(Editor* self, char c) {
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self->unsaved_changes = true;
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if (self->buffer_line == self->lines) {
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// if we are at the end of the file then we need to add a new line
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newline(self);
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// reallocate self->buffer to be 1 larger
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self->lines++;
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while (self->lines > self->capacity) {
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self->capacity++;
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}
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self->buffer = (String_t*)realloc(self->buffer, sizeof(String_t) * (self->capacity));
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// allocate the memory space for the new line and add it to the buffer
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self->buffer[self->buffer_line] = str_new();
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}
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insch(c);
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// insert the character into the string at the given index
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str_insert(&self->buffer[self->buffer_line], self->buffer_col, c);
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move_cursor(self, 1, 0);
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}
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void shutdown_editor(Editor* self) {
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for (size_t i = 0; i < self->capacity; i++) {
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str_dealloc(&self->buffer[i]);
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}
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str_dealloc(&self->filename);
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free(self->buffer);
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}
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