Move menu and rendering logic into separate files

1 files changed, 631 insertions, 0 deletions

diff --git a/menu.c b/menu.c
new file mode 100644
index 0000000..b85cc2a
--- /dev/null
+++ b/menu.c
@@ -0,0 +1,631 @@
+#define _POSIX_C_SOURCE 200809L
+#include <ctype.h>
+#include <poll.h>
+#include <stdbool.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/timerfd.h>
+#include <wayland-client.h>
+#include <wayland-client-protocol.h>
+#include <xkbcommon/xkbcommon.h>
+
+#include "menu.h"
+
+#include "pango.h"
+#include "render.h"
+
+static bool parse_color(const char *color, uint32_t *result) {
+	if (color[0] == '#') {
+		++color;
+	}
+	size_t len = strlen(color);
+	if ((len != 6 && len != 8) || !isxdigit(color[0]) || !isxdigit(color[1])) {
+		return false;
+	}
+	char *ptr;
+	uint32_t parsed = (uint32_t)strtoul(color, &ptr, 16);
+	if (*ptr != '\0') {
+		return false;
+	}
+	*result = len == 6 ? ((parsed << 8) | 0xFF) : parsed;
+	return true;
+}
+
+// Initialize the menu.
+void menu_init(struct menu *menu, int argc, char *argv[]) {
+	menu->strncmp = strncmp;
+	menu->font = "monospace 10";
+	menu->background = 0x222222ff;
+	menu->foreground = 0xbbbbbbff;
+	menu->promptbg = 0x005577ff;
+	menu->promptfg = 0xeeeeeeff;
+	menu->selectionbg = 0x005577ff;
+	menu->selectionfg = 0xeeeeeeff;
+
+	const char *usage =
+		"Usage: wmenu [-biv] [-f font] [-l lines] [-o output] [-p prompt]\n"
+		"\t[-N color] [-n color] [-M color] [-m color] [-S color] [-s color]\n";
+
+	int opt;
+	while ((opt = getopt(argc, argv, "bhivf:l:o:p:N:n:M:m:S:s:")) != -1) {
+		switch (opt) {
+		case 'b':
+			menu->bottom = true;
+			break;
+		case 'i':
+			menu->strncmp = strncasecmp;
+			break;
+		case 'v':
+			puts("wmenu " VERSION);
+			exit(EXIT_SUCCESS);
+		case 'f':
+			menu->font = optarg;
+			break;
+		case 'l':
+			menu->lines = atoi(optarg);
+			break;
+		case 'o':
+			menu->output_name = optarg;
+			break;
+		case 'p':
+			menu->prompt = optarg;
+			break;
+		case 'N':
+			if (!parse_color(optarg, &menu->background)) {
+				fprintf(stderr, "Invalid background color: %s", optarg);
+			}
+			break;
+		case 'n':
+			if (!parse_color(optarg, &menu->foreground)) {
+				fprintf(stderr, "Invalid foreground color: %s", optarg);
+			}
+			break;
+		case 'M':
+			if (!parse_color(optarg, &menu->promptbg)) {
+				fprintf(stderr, "Invalid prompt background color: %s", optarg);
+			}
+			break;
+		case 'm':
+			if (!parse_color(optarg, &menu->promptfg)) {
+				fprintf(stderr, "Invalid prompt foreground color: %s", optarg);
+			}
+			break;
+		case 'S':
+			if (!parse_color(optarg, &menu->selectionbg)) {
+				fprintf(stderr, "Invalid selection background color: %s", optarg);
+			}
+			break;
+		case 's':
+			if (!parse_color(optarg, &menu->selectionfg)) {
+				fprintf(stderr, "Invalid selection foreground color: %s", optarg);
+			}
+			break;
+		default:
+			fprintf(stderr, "%s", usage);
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	if (optind < argc) {
+		fprintf(stderr, "%s", usage);
+		exit(EXIT_FAILURE);
+	}
+
+	int height = get_font_height(menu->font);
+	menu->line_height = height + 3;
+	menu->height = menu->line_height;
+	if (menu->lines > 0) {
+		menu->height += menu->height * menu->lines;
+	}
+	menu->padding = height / 2;
+}
+
+static void append_page(struct page *page, struct page **first, struct page **last) {
+	if (*last) {
+		(*last)->next = page;
+	} else {
+		*first = page;
+	}
+	page->prev = *last;
+	page->next = NULL;
+	*last = page;
+}
+
+static void page_items(struct menu *menu) {
+	// Free existing pages
+	while (menu->pages != NULL) {
+		struct page *page = menu->pages;
+		menu->pages = menu->pages->next;
+		free(page);
+	}
+
+	if (!menu->matches) {
+		return;
+	}
+
+	// Make new pages
+	if (menu->lines > 0) {
+		struct page *pages_end = NULL;
+		struct item *item = menu->matches;
+		while (item) {
+			struct page *page = calloc(1, sizeof(struct page));
+			page->first = item;
+
+			for (int i = 1; item && i <= menu->lines; i++) {
+				item->page = page;
+				page->last = item;
+				item = item->next_match;
+			}
+			append_page(page, &menu->pages, &pages_end);
+		}
+	} else {
+		// Calculate available space
+		int max_width = menu->width - menu->inputw - menu->promptw
+			- menu->left_arrow - menu->right_arrow;
+
+		struct page *pages_end = NULL;
+		struct item *item = menu->matches;
+		while (item) {
+			struct page *page = calloc(1, sizeof(struct page));
+			page->first = item;
+
+			int total_width = 0;
+			while (item) {
+				total_width += item->width + 2 * menu->padding;
+				if (total_width > max_width) {
+					break;
+				}
+
+				item->page = page;
+				page->last = item;
+				item = item->next_match;
+			}
+			append_page(page, &menu->pages, &pages_end);
+		}
+	}
+}
+
+static const char *fstrstr(struct menu *menu, const char *s, const char *sub) {
+	for (size_t len = strlen(sub); *s; s++) {
+		if (!menu->strncmp(s, sub, len)) {
+			return s;
+		}
+	}
+	return NULL;
+}
+
+static void append_item(struct item *item, struct item **first, struct item **last) {
+	if (*last) {
+		(*last)->next_match = item;
+	} else {
+		*first = item;
+	}
+	item->prev_match = *last;
+	item->next_match = NULL;
+	*last = item;
+}
+
+static void match_items(struct menu *menu) {
+	struct item *lexact = NULL, *exactend = NULL;
+	struct item *lprefix = NULL, *prefixend = NULL;
+	struct item *lsubstr  = NULL, *substrend = NULL;
+	char buf[sizeof menu->input], *tok;
+	char **tokv = NULL;
+	int i, tokc = 0;
+	size_t tok_len;
+	menu->matches = NULL;
+	menu->matches_end = NULL;
+	menu->sel = NULL;
+
+	size_t text_len = strlen(menu->input);
+
+	/* tokenize text by space for matching the tokens individually */
+	strcpy(buf, menu->input);
+	tok = strtok(buf, " ");
+	while (tok) {
+		tokv = realloc(tokv, (tokc + 1) * sizeof *tokv);
+		if (!tokv) {
+			fprintf(stderr, "could not realloc %zu bytes",
+					(tokc + 1) * sizeof *tokv);
+			exit(EXIT_FAILURE);
+		}
+		tokv[tokc] = tok;
+		tokc++;
+		tok = strtok(NULL, " ");
+	}
+	tok_len = tokc ? strlen(tokv[0]) : 0;
+
+	struct item *item;
+	for (item = menu->items; item; item = item->next) {
+		for (i = 0; i < tokc; i++) {
+			if (!fstrstr(menu, item->text, tokv[i])) {
+				/* token does not match */
+				break;
+			}
+		}
+		if (i != tokc) {
+			/* not all tokens match */
+			continue;
+		}
+		if (!tokc || !menu->strncmp(menu->input, item->text, text_len + 1)) {
+			append_item(item, &lexact, &exactend);
+		} else if (!menu->strncmp(tokv[0], item->text, tok_len)) {
+			append_item(item, &lprefix, &prefixend);
+		} else {
+			append_item(item, &lsubstr, &substrend);
+		}
+	}
+
+	if (lexact) {
+		menu->matches = lexact;
+		menu->matches_end = exactend;
+	}
+	if (lprefix) {
+		if (menu->matches_end) {
+			menu->matches_end->next_match = lprefix;
+			lprefix->prev_match = menu->matches_end;
+		} else {
+			menu->matches = lprefix;
+		}
+		menu->matches_end = prefixend;
+	}
+	if (lsubstr) {
+		if (menu->matches_end) {
+			menu->matches_end->next_match = lsubstr;
+			lsubstr->prev_match = menu->matches_end;
+		} else {
+			menu->matches = lsubstr;
+		}
+		menu->matches_end = substrend;
+	}
+
+	page_items(menu);
+	if (menu->pages) {
+		menu->sel = menu->pages->first;
+	}
+}
+
+// Read menu items from standard input.
+void read_menu_items(struct menu *menu) {
+	char buf[sizeof menu->input], *p;
+	struct item *item, **end;
+
+	for(end = &menu->items; fgets(buf, sizeof buf, stdin); *end = item, end = &item->next) {
+		if((p = strchr(buf, '\n'))) {
+			*p = '\0';
+		}
+		item = malloc(sizeof *item);
+		if (!item) {
+			return;
+		}
+
+		item->text = strdup(buf);
+		item->next = item->prev_match = item->next_match = NULL;
+	}
+
+	calc_widths(menu);
+	match_items(menu);
+}
+
+static void insert(struct menu *menu, const char *s, ssize_t n) {
+	if (strlen(menu->input) + n > sizeof menu->input - 1) {
+		return;
+	}
+	memmove(menu->input + menu->cursor + n, menu->input + menu->cursor,
+			sizeof menu->input - menu->cursor - MAX(n, 0));
+	if (n > 0 && s != NULL) {
+		memcpy(menu->input + menu->cursor, s, n);
+	}
+	menu->cursor += n;
+}
+
+static size_t nextrune(struct menu *menu, int incr) {
+	size_t n, len;
+
+	len = strlen(menu->input);
+	for(n = menu->cursor + incr; n < len && (menu->input[n] & 0xc0) == 0x80; n += incr);
+	return n;
+}
+
+// Move the cursor to the beginning or end of the word, skipping over any preceding whitespace.
+static void movewordedge(struct menu *menu, int dir) {
+	size_t len = strlen(menu->input);
+	while (menu->cursor > 0 && menu->cursor < len && menu->input[nextrune(menu, dir)] == ' ') {
+		menu->cursor = nextrune(menu, dir);
+	}
+	while (menu->cursor > 0 && menu->cursor < len && menu->input[nextrune(menu, dir)] != ' ') {
+		menu->cursor = nextrune(menu, dir);
+	}
+}
+
+// Handle a keypress.
+void menu_keypress(struct menu *menu, enum wl_keyboard_key_state key_state,
+		xkb_keysym_t sym) {
+	if (key_state != WL_KEYBOARD_KEY_STATE_PRESSED) {
+		return;
+	}
+
+	bool ctrl = xkb_state_mod_name_is_active(menu->keyboard->xkb_state,
+			XKB_MOD_NAME_CTRL,
+			XKB_STATE_MODS_DEPRESSED | XKB_STATE_MODS_LATCHED);
+	bool meta = xkb_state_mod_name_is_active(menu->keyboard->xkb_state,
+			XKB_MOD_NAME_ALT,
+			XKB_STATE_MODS_DEPRESSED | XKB_STATE_MODS_LATCHED);
+	bool shift = xkb_state_mod_name_is_active(menu->keyboard->xkb_state,
+			XKB_MOD_NAME_SHIFT,
+			XKB_STATE_MODS_DEPRESSED | XKB_STATE_MODS_LATCHED);
+
+	size_t len = strlen(menu->input);
+
+	if (ctrl) {
+		// Emacs-style line editing bindings
+		switch (sym) {
+		case XKB_KEY_a:
+			sym = XKB_KEY_Home;
+			break;
+		case XKB_KEY_b:
+			sym = XKB_KEY_Left;
+			break;
+		case XKB_KEY_c:
+			sym = XKB_KEY_Escape;
+			break;
+		case XKB_KEY_d:
+			sym = XKB_KEY_Delete;
+			break;
+		case XKB_KEY_e:
+			sym = XKB_KEY_End;
+			break;
+		case XKB_KEY_f:
+			sym = XKB_KEY_Right;
+			break;
+		case XKB_KEY_g:
+			sym = XKB_KEY_Escape;
+			break;
+		case XKB_KEY_bracketleft:
+			sym = XKB_KEY_Escape;
+			break;
+		case XKB_KEY_h:
+			sym = XKB_KEY_BackSpace;
+			break;
+		case XKB_KEY_i:
+			sym = XKB_KEY_Tab;
+			break;
+		case XKB_KEY_j:
+		case XKB_KEY_J:
+		case XKB_KEY_m:
+		case XKB_KEY_M:
+			sym = XKB_KEY_Return;
+			ctrl = false;
+			break;
+		case XKB_KEY_n:
+			sym = XKB_KEY_Down;
+			break;
+		case XKB_KEY_p:
+			sym = XKB_KEY_Up;
+			break;
+
+		case XKB_KEY_k:
+			// Delete right
+			menu->input[menu->cursor] = '\0';
+			match_items(menu);
+			render_menu(menu);
+			return;
+		case XKB_KEY_u:
+			// Delete left
+			insert(menu, NULL, 0 - menu->cursor);
+			match_items(menu);
+			render_menu(menu);
+			return;
+		case XKB_KEY_w:
+			// Delete word
+			while (menu->cursor > 0 && menu->input[nextrune(menu, -1)] == ' ') {
+				insert(menu, NULL, nextrune(menu, -1) - menu->cursor);
+			}
+			while (menu->cursor > 0 && menu->input[nextrune(menu, -1)] != ' ') {
+				insert(menu, NULL, nextrune(menu, -1) - menu->cursor);
+			}
+			match_items(menu);
+			render_menu(menu);
+			return;
+		case XKB_KEY_Y:
+			// Paste clipboard
+			if (!menu->offer) {
+				return;
+			}
+
+			int fds[2];
+			if (pipe(fds) == -1) {
+				// Pipe failed
+				return;
+			}
+			wl_data_offer_receive(menu->offer, "text/plain", fds[1]);
+			close(fds[1]);
+
+			wl_display_roundtrip(menu->display);
+
+			while (true) {
+				char buf[1024];
+				ssize_t n = read(fds[0], buf, sizeof(buf));
+				if (n <= 0) {
+					break;
+				}
+				insert(menu, buf, n);
+			}
+			close(fds[0]);
+
+			wl_data_offer_destroy(menu->offer);
+			menu->offer = NULL;
+			match_items(menu);
+			render_menu(menu);
+			return;
+		case XKB_KEY_Left:
+		case XKB_KEY_KP_Left:
+			movewordedge(menu, -1);
+			render_menu(menu);
+			return;
+		case XKB_KEY_Right:
+		case XKB_KEY_KP_Right:
+			movewordedge(menu, +1);
+			render_menu(menu);
+			return;
+
+		case XKB_KEY_Return:
+		case XKB_KEY_KP_Enter:
+			break;
+		default:
+			return;
+		}
+	} else if (meta) {
+		// Emacs-style line editing bindings
+		switch (sym) {
+		case XKB_KEY_b:
+			movewordedge(menu, -1);
+			render_menu(menu);
+			return;
+		case XKB_KEY_f:
+			movewordedge(menu, +1);
+			render_menu(menu);
+			return;
+		case XKB_KEY_g:
+			sym = XKB_KEY_Home;
+			break;
+		case XKB_KEY_G:
+			sym = XKB_KEY_End;
+			break;
+		case XKB_KEY_h:
+			sym = XKB_KEY_Up;
+			break;
+		case XKB_KEY_j:
+			sym = XKB_KEY_Next;
+			break;
+		case XKB_KEY_k:
+			sym = XKB_KEY_Prior;
+			break;
+		case XKB_KEY_l:
+			sym = XKB_KEY_Down;
+			break;
+		default:
+			return;
+		}
+	}
+
+	char buf[8];
+	switch (sym) {
+	case XKB_KEY_Return:
+	case XKB_KEY_KP_Enter:
+		if (shift) {
+			puts(menu->input);
+			fflush(stdout);
+			menu->exit = true;
+		} else {
+			char *text = menu->sel ? menu->sel->text : menu->input;
+			puts(text);
+			fflush(stdout);
+			if (!ctrl) {
+				menu->exit = true;
+			}
+		}
+		break;
+	case XKB_KEY_Left:
+	case XKB_KEY_KP_Left:
+	case XKB_KEY_Up:
+	case XKB_KEY_KP_Up:
+		if (menu->sel && menu->sel->prev_match) {
+			menu->sel = menu->sel->prev_match;
+			render_menu(menu);
+		} else if (menu->cursor > 0) {
+			menu->cursor = nextrune(menu, -1);
+			render_menu(menu);
+		}
+		break;
+	case XKB_KEY_Right:
+	case XKB_KEY_KP_Right:
+	case XKB_KEY_Down:
+	case XKB_KEY_KP_Down:
+		if (menu->cursor < len) {
+			menu->cursor = nextrune(menu, +1);
+			render_menu(menu);
+		} else if (menu->sel && menu->sel->next_match) {
+			menu->sel = menu->sel->next_match;
+			render_menu(menu);
+		}
+		break;
+	case XKB_KEY_Prior:
+	case XKB_KEY_KP_Prior:
+		if (menu->sel && menu->sel->page->prev) {
+			menu->sel = menu->sel->page->prev->first;
+			render_menu(menu);
+		}
+		break;
+	case XKB_KEY_Next:
+	case XKB_KEY_KP_Next:
+		if (menu->sel && menu->sel->page->next) {
+			menu->sel = menu->sel->page->next->first;
+			render_menu(menu);
+		}
+		break;
+	case XKB_KEY_Home:
+	case XKB_KEY_KP_Home:
+		if (menu->sel == menu->matches) {
+			menu->cursor = 0;
+			render_menu(menu);
+		} else {
+			menu->sel = menu->matches;
+			render_menu(menu);
+		}
+		break;
+	case XKB_KEY_End:
+	case XKB_KEY_KP_End:
+		if (menu->cursor < len) {
+			menu->cursor = len;
+			render_menu(menu);
+		} else {
+			menu->sel = menu->matches_end;
+			render_menu(menu);
+		}
+		break;
+	case XKB_KEY_BackSpace:
+		if (menu->cursor > 0) {
+			insert(menu, NULL, nextrune(menu, -1) - menu->cursor);
+			match_items(menu);
+			render_menu(menu);
+		}
+		break;
+	case XKB_KEY_Delete:
+	case XKB_KEY_KP_Delete:
+		if (menu->cursor == len) {
+			return;
+		}
+		menu->cursor = nextrune(menu, +1);
+		insert(menu, NULL, nextrune(menu, -1) - menu->cursor);
+		match_items(menu);
+		render_menu(menu);
+		break;
+	case XKB_KEY_Tab:
+		if (!menu->sel) {
+			return;
+		}
+		menu->cursor = strnlen(menu->sel->text, sizeof menu->input - 1);
+		memcpy(menu->input, menu->sel->text, menu->cursor);
+		menu->input[menu->cursor] = '\0';
+		match_items(menu);
+		render_menu(menu);
+		break;
+	case XKB_KEY_Escape:
+		menu->exit = true;
+		menu->failure = true;
+		break;
+	default:
+		if (xkb_keysym_to_utf8(sym, buf, 8)) {
+			insert(menu, buf, strnlen(buf, 8));
+			match_items(menu);
+			render_menu(menu);
+		}
+	}
+}