300 lines
8.3 KiB
C
300 lines
8.3 KiB
C
#include "tui.h"
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#include <time.h>
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#include <ncurses.h>
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#include <readline/readline.h>
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#include "caret_notater.h"
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extern bool do_execute;
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/* I fucking hate readline.
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* Apparently the only way to set an initial value is using a hook.
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* What makes this extra painful is that readline cannot be explicitly
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* initialized nor is it documented clearly that shit will segfault
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* otherwise.
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* If I ever find out what is a sensible alternative im ditching it forever.
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*/
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const char * initial_text;
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const char * get_input_line(void) { return rl_line_buffer; }
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/* "Cursor" position; the entry selected by the user
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*/
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size_t selection_relative = 0;
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size_t selection_offset = 0;
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size_t entry_lines;
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bool is_input_changed = true;
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bool do_redisplay = true;
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/* Counter to signal which line to print to,
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* and saved counterpart which is used to
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* determine how many lines were printed.
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*/
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static size_t entry_line_index = 0;
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static size_t last_entry_line_index = 0;
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static char version_string[] =
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# include "version.inc"
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;
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// Ncurses fun
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static WINDOW * main_window;
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static WINDOW * entry_window;
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static WINDOW * input_window;
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static WINDOW * version_window;
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// Readline requirements
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static int input_available = false;
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static int input;
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//
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static inline void update_input(void);
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static void full_redraw(void);
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static bool do_fullredraw = true;
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int init_tui(void) {
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// Ncurses
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initscr();
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nonl();
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cbreak();
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noecho();
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curs_set(0);
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keypad(stdscr, TRUE);
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entry_lines = LINES-3;
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main_window = newwin(LINES-1, COLS, 0, 0);
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input_window = newwin( 1, COLS, LINES-1, 0);
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entry_window = subwin(main_window, entry_lines, COLS-2, 1, 1);
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version_window = subwin(main_window, 1, strlen(version_string), 0, 5);
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refresh();
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// Readline
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rl_bind_key('\t', rl_insert);
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rl_catch_signals = 0;
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rl_catch_sigwinch = 0;
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rl_change_environment = 0;
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rl_prep_term_function = NULL;
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rl_deprep_term_function = NULL;
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int getc_function([[maybe_unused]] FILE* ignore) { input_available = false; return (int)(input); }
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int return_input_available(void) { return input_available; }
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int initializer(void) { rl_insert_text(initial_text); return 0; }
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rl_getc_function = getc_function;
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rl_input_available_hook = return_input_available;
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rl_startup_hook = initializer;
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/* Due to this bug: https://mail.gnu.org/archive/html/bug-readline/2013-09/msg00021.html ;
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* we cannot null this function.
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* Im seriously questioning why readline is still the """default""" library in the wild
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* and whether i should participate.
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*/
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void redisplay_nop(void) { return; }
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rl_redisplay_function = redisplay_nop;
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/* We must specify an input handler or readline chimps out,
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* but we dont want the line to be actually submittable,
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* (search is continous and that would delete what the user
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* has typedso far)
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* so we also override enter to do nothing.
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*/
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void no_op_handler([[maybe_unused]] char *line) { return; }
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int no_op_bind([[maybe_unused]] int i, [[maybe_unused]] int h) { return 0; }
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rl_callback_handler_install("", no_op_handler);
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rl_bind_key('\n', no_op_bind);
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return 0;
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}
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int deinit_tui(void) {
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endwin();
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return 0;
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}
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void tui_append_back(const entry_t entry) {
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const int TIME_SIZE = 19 + 1;
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char time_buffer[TIME_SIZE];
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strftime(time_buffer, TIME_SIZE, "%Y-%m-%d %H:%M:%S", localtime((time_t*)&entry.timestamp));
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char caret_notation_buffer[(strlen(entry.command)*2)+1];
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const size_t current_line_y = (entry_lines-1)-entry_line_index;
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if (entry_line_index == selection_relative) {
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wattron(entry_window, A_REVERSE);
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}
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mvwprintw(entry_window, current_line_y, 0,
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"%s %.*s",
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time_buffer,
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getmaxx(entry_window) - (TIME_SIZE-1) - /*space-padding*/2,
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string_to_caret_notation(entry.command,
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strlen(entry.command),
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caret_notation_buffer
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)
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);
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if (entry_line_index == selection_relative) {
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wattroff(entry_window, A_REVERSE);
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}
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/* Only delete to the end of the line if the cursor did not overflow
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* to the line below from a long entry.
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*/
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if ((size_t)getcury(entry_window) == current_line_y) {
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wclrtoeol(entry_window);
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}
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++entry_line_index;
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}
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static
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void full_redraw(void) {
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box(main_window, 0, 0);
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waddstr(version_window, version_string);
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update_input();
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wnoutrefresh(version_window);
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doupdate();
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}
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void tui_rearm() {
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entry_line_index = 0;
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}
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static inline
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void update_input() {
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const char * const prompt = "$ ";
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wmove(input_window, 0, 0);
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waddstr(input_window, prompt);
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waddnstr(input_window, rl_line_buffer, rl_point);
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wattron(input_window, A_REVERSE);
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if (rl_point == rl_end) {
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waddch(input_window, ' ');
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wattroff(input_window, A_REVERSE);
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} else {
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waddch(input_window, rl_line_buffer[rl_point]);
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wattroff(input_window, A_REVERSE);
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waddnstr(input_window, rl_line_buffer + rl_point + 1, rl_end - rl_point);
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}
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wclrtoeol(input_window);
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wnoutrefresh(input_window);
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}
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void tui_refresh(void) {
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// XXX: this is dirty
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if (selection_relative > last_entry_line_index-1) {
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selection_relative = last_entry_line_index-2;
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do_redisplay = true;
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return;
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}
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if (do_fullredraw) {
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do_fullredraw = false;
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full_redraw();
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return;
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}
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last_entry_line_index = entry_line_index;
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while (entry_line_index < entry_lines) {
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wmove(entry_window, (entry_lines-1)-entry_line_index++, 0);
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wclrtoeol(entry_window);
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}
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entry_line_index = 0;
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update_input();
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wnoutrefresh(entry_window);
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wnoutrefresh(main_window);
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doupdate();
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}
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void tui_take_input(void) {
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extern bool do_run;
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const size_t paging_size = entry_lines / 2;
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input = wgetch(stdscr);
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switch (input) {
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case KEY_UP:
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case CTRL('p'):
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case CTRL('k'): {
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if (selection_relative == last_entry_line_index-1
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&& entry_lines != last_entry_line_index) {
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break;
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}
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if (selection_relative != entry_lines-1) {
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++selection_relative;
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do_redisplay = true;
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} else {
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++selection_offset;
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is_input_changed = true;
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}
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} break;
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case KEY_DOWN:
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case CTRL('n'):
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case CTRL('j'): {
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if (selection_relative != 0) {
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--selection_relative;
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do_redisplay = true;
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} else {
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if (selection_offset != 0) {
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--selection_offset;
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is_input_changed = true;
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}
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}
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} break;
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case KEY_PPAGE:
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case CTRL('u'): {
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selection_offset += paging_size;
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is_input_changed = true;
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} break;
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case KEY_NPAGE:
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case CTRL('d'): {
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if (selection_offset == 0) {
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selection_relative = 0;
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do_redisplay = true;
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} else
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if (selection_offset > paging_size) {
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selection_offset -= paging_size;
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is_input_changed = true;
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} else {
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selection_offset = 0;
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is_input_changed = true;
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}
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} break;
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case CTRL('q'): {
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do_execute = false;
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do_run = false;
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} break;
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case KEY_LEFT: {
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if (rl_point != 0) {
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--rl_point;
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is_input_changed = true;
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}
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} break;
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case KEY_RIGHT: {
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if (rl_point != rl_end) {
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++rl_point;
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is_input_changed = true;
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}
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} break;
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case '\r': {
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do_run = false;
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} break;
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case ERR: break;
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default: {
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input_available = true;
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rl_callback_read_char();
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is_input_changed = true;
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} break;
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}
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if (is_input_changed) {
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do_redisplay = true;
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}
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}
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