toaruos/apps/help-browser.c

463 lines
12 KiB
C

/* vim: tabstop=4 shiftwidth=4 noexpandtab
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2018-2020 K. Lange
*
* help-browser - Display documentation.
*
* This is a work-in-progress reimplementation of the help browser
* from mainline ToaruOS. It is currently incomplete.
*
* Eventually, this should be a rich text document browser, almost
* akin to a web browser. Right now it just says "Hello, world."
*/
#include <stdio.h>
#include <unistd.h>
#include <toaru/yutani.h>
#include <toaru/graphics.h>
#include <toaru/decorations.h>
#include <toaru/menu.h>
#include <toaru/sdf.h>
#include <toaru/markup.h>
#define APPLICATION_TITLE "Help Browser"
#define HELP_DIR "/usr/share/help"
static yutani_t * yctx;
static yutani_window_t * main_window;
static gfx_context_t * ctx;
static int application_running = 1;
static gfx_context_t * contents = NULL;
static sprite_t * contents_sprite = NULL;
static char * current_topic = NULL;
/* Markup Renderer { */
#define BASE_X 0
#define BASE_Y 0
#define LINE_HEIGHT 20
#define HEAD_HEIGHT 28
static gfx_context_t * nctx = NULL;
static int cursor_y = 0;
static int cursor_x = 0;
static list_t * state = NULL;
static int current_state = 0;
struct Char {
char c; /* TODO: unicode */
char state;
};
//static list_t * lines = NULL;
static list_t * buffer = NULL;
static int state_to_font(int current_state) {
if (current_state & (1 << 0)) {
if (current_state & (1 << 1)) {
return SDF_FONT_BOLD_OBLIQUE;
}
return SDF_FONT_BOLD;
} else if (current_state & (1 << 1)) {
return SDF_FONT_OBLIQUE;
}
return SDF_FONT_THIN;
}
static int current_size(void) {
if (current_state & (1 << 2)) {
return 24;
}
return 16;
}
static int buffer_width(list_t * buffer) {
int out = 0;
foreach(node, buffer) {
struct Char * c = node->value;
char tmp[2] = {c->c, '\0'};
out += draw_sdf_string_width(tmp, current_size(), state_to_font(c->state));
}
return out;
}
static int draw_buffer(list_t * buffer) {
int x = 0;
while (buffer->length) {
node_t * node = list_dequeue(buffer);
struct Char * c = node->value;
char tmp[2] = { c->c, '\0' };
x += draw_sdf_string(nctx, cursor_x + x, cursor_y, tmp, current_size(), 0xFF000000, state_to_font(c->state));
free(c);
free(node);
}
x += 4;
return x;
}
static int current_line_height(void) {
if (current_state & (1 << 2)) {
return HEAD_HEIGHT;
} else {
return LINE_HEIGHT;
}
}
static void write_buffer(void) {
if (buffer_width(buffer) + cursor_x > nctx->width) {
cursor_x = BASE_X;
cursor_y += current_line_height();
}
cursor_x += draw_buffer(buffer);
}
static int parser_open(struct markup_state * self, void * user, struct markup_tag * tag) {
if (!strcmp(tag->name, "b")) {
list_insert(state, (void*)current_state);
current_state |= (1 << 0);
} else if (!strcmp(tag->name, "i")) {
list_insert(state, (void*)current_state);
current_state |= (1 << 1);
} else if (!strcmp(tag->name, "h1")) {
list_insert(state, (void*)current_state);
current_state |= (1 << 2);
} else if (!strcmp(tag->name, "br")) {
write_buffer();
cursor_x = BASE_X;
cursor_y += current_line_height();
}
markup_free_tag(tag);
return 0;
}
static int parser_close(struct markup_state * self, void * user, char * tag_name) {
if (!strcmp(tag_name, "b")) {
node_t * nstate = list_pop(state);
current_state = (int)nstate->value;
free(nstate);
} else if (!strcmp(tag_name, "i")) {
node_t * nstate = list_pop(state);
current_state = (int)nstate->value;
free(nstate);
} else if (!strcmp(tag_name, "h1")) {
write_buffer();
cursor_x = BASE_X;
cursor_y += current_line_height();
node_t * nstate = list_pop(state);
current_state = (int)nstate->value;
free(nstate);
}
return 0;
}
static int parser_data(struct markup_state * self, void * user, char * data) {
char * c = data;
while (*c) {
if (*c == ' ' || *c == '\n') {
if (buffer->length) {
write_buffer();
}
} else {
struct Char * ch = malloc(sizeof(struct Char));
ch->c = *c;
ch->state = current_state;
list_insert(buffer, ch);
}
c++;
}
return 0;
}
/* } End Markup Renderer */
static struct menu_bar menu_bar = {0};
static struct menu_bar_entries menu_entries[] = {
{"File", "file"},
{"Go", "go"},
{"Help", "help"},
{NULL, NULL},
};
static void _menu_action_exit(struct MenuEntry * entry) {
application_running = 0;
}
static void reinitialize_contents(void) {
if (contents) {
free(contents);
}
if (contents_sprite) {
sprite_free(contents_sprite);
}
/* Calculate height for current directory */
int calculated_height = 200;
struct decor_bounds bounds;
decor_get_bounds(main_window, &bounds);
contents_sprite = create_sprite(main_window->width - bounds.width, calculated_height, ALPHA_EMBEDDED);
contents = init_graphics_sprite(contents_sprite);
draw_fill(contents, rgb(255,255,255));
nctx = contents;
struct markup_state * parser = markup_init(NULL, parser_open, parser_close, parser_data);
cursor_y = BASE_Y;
cursor_x = BASE_X;
state = list_create();
buffer = list_create();
char * str = current_topic;
while (*str) {
if (markup_parse(parser, *str++)) {
fprintf(stderr,"There was an error.\n");
return;
}
}
markup_finish(parser);
write_buffer();
list_free(state);
free(state);
free(buffer);
}
static void redraw_window(void) {
draw_fill(ctx, rgb(255,255,255));
render_decorations(main_window, ctx, APPLICATION_TITLE);
struct decor_bounds bounds;
decor_get_bounds(main_window, &bounds);
menu_bar.x = bounds.left_width;
menu_bar.y = bounds.top_height;
menu_bar.width = ctx->width - bounds.width;
menu_bar.window = main_window;
menu_bar_render(&menu_bar, ctx);
gfx_clear_clip(ctx);
gfx_add_clip(ctx, bounds.left_width, bounds.top_height + MENU_BAR_HEIGHT, ctx->width - bounds.width, ctx->height - MENU_BAR_HEIGHT - bounds.height);
draw_sprite(ctx, contents_sprite, bounds.left_width, bounds.top_height + MENU_BAR_HEIGHT);
gfx_clear_clip(ctx);
gfx_add_clip(ctx, 0, 0, ctx->width, ctx->height);
flip(ctx);
yutani_flip(yctx, main_window);
}
static void resize_finish(int w, int h) {
int height_changed = (main_window->width != (unsigned int)w);
yutani_window_resize_accept(yctx, main_window, w, h);
reinit_graphics_yutani(ctx, main_window);
if (height_changed) {
reinitialize_contents();
}
redraw_window();
yutani_window_resize_done(yctx, main_window);
yutani_flip(yctx, main_window);
}
static void navigate(const char * t) {
if (current_topic) free(current_topic);
char file_path[1024];
if (t[0] == '/') {
sprintf(file_path, "%s", t);
} else {
sprintf(file_path, "%s/%s", HELP_DIR, t);
}
FILE * f = fopen(file_path, "r");
if (!f) {
current_topic = strdup("File not found.");
} else {
fseek(f, 0, SEEK_END);
size_t size = ftell(f);
fseek(f, 0, SEEK_SET);
current_topic = malloc(size+1);
fread(current_topic, 1, size, f);
current_topic[size] = '\0';
fclose(f);
}
reinitialize_contents();
redraw_window();
}
static void _menu_action_navigate(struct MenuEntry * entry) {
/* go to entry->action */
struct MenuEntry_Normal * _entry = (void*)entry;
navigate(_entry->action);
}
#if 0
static void _menu_action_back(struct MenuEntry * entry) {
/* go back */
}
static void _menu_action_forward(struct MenuEntry * entry) {
/* go forward */
}
#endif
static void _menu_action_about(struct MenuEntry * entry) {
/* Show About dialog */
char about_cmd[1024] = "\0";
strcat(about_cmd, "about \"About Help Browser\" /usr/share/icons/48/help.bmp \"ToaruOS Help Browser\" \"(C) 2018-2020 K. Lange\n-\nPart of ToaruOS, which is free software\nreleased under the NCSA/University of Illinois\nlicense.\n-\n%https://toaruos.org\n%https://github.com/klange/toaruos\" ");
char coords[100];
sprintf(coords, "%d %d &", (int)main_window->x + (int)main_window->width / 2, (int)main_window->y + (int)main_window->height / 2);
strcat(about_cmd, coords);
system(about_cmd);
redraw_window();
}
int main(int argc, char * argv[]) {
yctx = yutani_init();
init_decorations();
main_window = yutani_window_create(yctx, 640, 480);
yutani_window_move(yctx, main_window, yctx->display_width / 2 - main_window->width / 2, yctx->display_height / 2 - main_window->height / 2);
ctx = init_graphics_yutani_double_buffer(main_window);
yutani_window_advertise_icon(yctx, main_window, APPLICATION_TITLE, "help");
menu_bar.entries = menu_entries;
menu_bar.redraw_callback = redraw_window;
menu_bar.set = menu_set_create();
struct MenuList * m = menu_create(); /* File */
menu_insert(m, menu_create_normal("exit",NULL,"Exit", _menu_action_exit));
menu_set_insert(menu_bar.set, "file", m);
m = menu_create(); /* Go */
menu_insert(m, menu_create_normal("home","0_index.trt","Home",_menu_action_navigate));
menu_insert(m, menu_create_normal("bookmark","special:contents","Topics",_menu_action_navigate));
#if 0
/* TODO: History */
menu_insert(m, menu_create_separator());
menu_insert(m, menu_create_normal("back",NULL,"Back",_menu_action_back));
menu_insert(m, menu_create_normal("forward",NULL,"Forward",_menu_action_forward));
#endif
menu_set_insert(menu_bar.set, "go", m);
m = menu_create();
menu_insert(m, menu_create_normal("help","help-browser.trt","Contents",_menu_action_navigate));
menu_insert(m, menu_create_separator());
menu_insert(m, menu_create_normal("star",NULL,"About " APPLICATION_TITLE,_menu_action_about));
menu_set_insert(menu_bar.set, "help", m);
if (argc > 1) {
navigate(argv[1]);
} else {
navigate("0_index.trt");
}
while (application_running) {
yutani_msg_t * m = yutani_poll(yctx);
while (m) {
if (menu_process_event(yctx, m)) {
redraw_window();
}
switch (m->type) {
case YUTANI_MSG_KEY_EVENT:
{
struct yutani_msg_key_event * ke = (void*)m->data;
if (ke->event.action == KEY_ACTION_DOWN && ke->wid == main_window->wid) {
switch (ke->event.keycode) {
case 'f':
if (ke->event.modifiers & YUTANI_KEY_MODIFIER_ALT) {
menu_bar_show_menu(yctx,main_window,&menu_bar,-1,&menu_entries[0]);
}
break;
case 'g':
if (ke->event.modifiers & YUTANI_KEY_MODIFIER_ALT) {
menu_bar_show_menu(yctx,main_window,&menu_bar,-1,&menu_entries[1]);
}
break;
case 'h':
if (ke->event.modifiers & YUTANI_KEY_MODIFIER_ALT) {
menu_bar_show_menu(yctx,main_window,&menu_bar,-1,&menu_entries[2]);
}
break;
case 'q':
_menu_action_exit(NULL);
break;
}
}
}
break;
case YUTANI_MSG_WINDOW_FOCUS_CHANGE:
{
struct yutani_msg_window_focus_change * wf = (void*)m->data;
yutani_window_t * win = hashmap_get(yctx->windows, (void*)wf->wid);
if (win == main_window) {
win->focused = wf->focused;
redraw_window();
}
}
break;
case YUTANI_MSG_RESIZE_OFFER:
{
struct yutani_msg_window_resize * wr = (void*)m->data;
if (wr->wid == main_window->wid) {
resize_finish(wr->width, wr->height);
}
}
break;
case YUTANI_MSG_WINDOW_MOUSE_EVENT:
{
struct yutani_msg_window_mouse_event * me = (void*)m->data;
yutani_window_t * win = hashmap_get(yctx->windows, (void*)me->wid);
if (win == main_window) {
int result = decor_handle_event(yctx, m);
switch (result) {
case DECOR_CLOSE:
_menu_action_exit(NULL);
break;
case DECOR_RIGHT:
/* right click in decoration, show appropriate menu */
decor_show_default_menu(main_window, main_window->x + me->new_x, main_window->y + me->new_y);
break;
default:
/* Other actions */
break;
}
/* Menu bar */
menu_bar_mouse_event(yctx, main_window, &menu_bar, me, me->new_x, me->new_y);
}
}
break;
case YUTANI_MSG_WINDOW_CLOSE:
case YUTANI_MSG_SESSION_END:
_menu_action_exit(NULL);
break;
default:
break;
}
free(m);
m = yutani_poll_async(yctx);
}
}
}