Use a const char to store the static string.

[herrie-working.git] / herrie / src / gui_input.c

/*
 * Copyright (c) 2006-2009 Ed Schouten <ed@80386.nl>
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/**
 * @file gui_input.c
 * @brief Keyboard and signal input for user interface.
 */

#include "stdinc.h"

#include "audio_output.h"
#include "config.h"
#include "dbus.h"
#include "gui.h"
#include "gui_internal.h"
#include "playq.h"
#include "scrobbler.h"
#include "vfs.h"

/**
 * @brief The focus is on the browser.
 */
#define GUI_FOCUS_BROWSER       0
/**
 * @brief The focus is on the playlist.
 */
#define GUI_FOCUS_PLAYQ         1
/**
 * @brief The number of focusable windows.
 */
#define GUI_FOCUS_COUNT         2
/**
 * @brief Window that is currently focused.
 */
static int gui_input_curfocus = GUI_FOCUS_BROWSER;
/**
 * @brief Indicator of the current search string.
 */
static struct vfsmatch *cursearch = NULL;
/**
 * @brief The last seek string that has been entered.
 */
static char *curseek = NULL;
/**
 * @brief Determine if we're already trying to shut down, to prevent
 *        multiple signals being handled while quitting.
 */
static int shutting_down = 0;
/**
 * @brief Add the Ctrl modifier to a character.
 */
#define CTRL(x) (((x) - 'A' + 1) & 0x7f)

/**
 * @brief Properly shutdown the application by stopping playback and
 *        destroying the GUI.
 */
static void
gui_input_quit(void)
{
        shutting_down = 1;

        playq_shutdown();
#ifdef BUILD_SCROBBLER
        scrobbler_shutdown();
#endif /* BUILD_SCROBBLER */
        audio_output_close();
        gui_draw_destroy();
        exit(0);
}

/**
 * @brief Prompt the user with a message to confirm termination of the
 *        application.
 */
static void
gui_input_askquit(void)
{
        int ret;
        char *msg;

        if (!config_getopt_bool("gui.input.may_quit")) {
                gui_msgbar_warn(_("Use kill(1) to quit."));
                return;
        }

        msg = g_strdup_printf(_("Quit %s?"), APP_NAME);
        ret = gui_input_askyesno(msg);
        g_free(msg);

        if (ret == 0)
                gui_input_quit();
}

/**
 * @brief Fetch a character from the keyboard, already processing
 *        terminal resizes and awkward bugs.
 */
static int
gui_input_getch(void)
{
        int ch;

        for (;;) {
                ch = getch();

                switch (ch) {
                /* Redraw everything when resizing */
                case KEY_RESIZE:
                case CTRL('L'):
                        gui_draw_resize();
                        continue;

                /* Catch backspace button */
                case CTRL('H'):
                case CTRL('?'):
                        return (KEY_BACKSPACE);

                /* FreeBSD returns KEY_SELECT instead of KEY_END */
                case KEY_SELECT:
                        return (KEY_END);

                /* Error condition */
                case ERR:
                        switch (errno) {
                        case 0:
                        case EINTR:
                                /* Signal delivery */
                                continue;
                        default:
                                /* We've lost stdin */
                                gui_input_quit();
                        }
                }

                break;
        }

        return (ch);
}

/**
 * @brief Switch the focus to the next window.
 */
static void
gui_input_switchfocus(void)
{
        gui_input_curfocus++;
        gui_input_curfocus %= GUI_FOCUS_COUNT;

        /* Update the selection colors */
        gui_playq_setfocus(gui_input_curfocus == GUI_FOCUS_PLAYQ);
        gui_browser_setfocus(gui_input_curfocus == GUI_FOCUS_BROWSER);
}

/**
 * @brief Ask the user to enter a new search string.
 */
static int
gui_input_asksearch(void)
{
        char *str;
        const char *old = NULL;
        struct vfsmatch *vm;

        /* Show the previous value if we have one */
        if (cursearch != NULL)
                old = vfs_match_value(cursearch);

        /* Allow the user to enter a search string */
        str = gui_input_askstring(_("Search for"), old, NULL);
        if (str == NULL)
                return (-1);
        
        vm = vfs_match_new(str);
        if (vm == NULL) {
                gui_msgbar_warn(_("Bad pattern."));
                g_free(str);
                return (-1);
        }

        /* Replace our search string */
        if (cursearch != NULL)
                vfs_match_free(cursearch);
        cursearch = vm;

        str = g_strdup_printf(_("Searching for \"%s\"..."),
            vfs_match_value(vm));
        gui_msgbar_warn(str);
        g_free(str);

        return (0);
}

/**
 * @brief Ask the user to enter a search string when none was given and
 *        search for the next item matching the search string.
 */
static void
gui_input_searchnext(void)
{
        int nfocus = GUI_FOCUS_PLAYQ;

        if (cursearch == NULL) {
                /* No search string yet */
                if (gui_input_asksearch() != 0)
                        return;
        }

        /*
         * We want to change our search order depending on which dialog
         * is currently focused. This code is quite awful, but does the
         * thing. When the playq is focused, it only performs the first
         * two searches. If the browser is focused, it only performs the
         * last two.
         */
        if (gui_input_curfocus == GUI_FOCUS_PLAYQ &&
            gui_playq_searchnext(cursearch) == 0) {
                goto found;
        } else if (gui_browser_searchnext(cursearch) == 0) {
                nfocus = GUI_FOCUS_BROWSER;
                goto found;
        } else if (gui_input_curfocus != GUI_FOCUS_PLAYQ &&
            gui_playq_searchnext(cursearch) == 0) {
                goto found;
        }

        /* Bad luck. */
        gui_msgbar_warn(_("Not found."));
        return;

found:  /* Focus the window with the match and redraw them. */
        gui_input_curfocus = nfocus;
        gui_playq_setfocus(gui_input_curfocus == GUI_FOCUS_PLAYQ);
        gui_browser_setfocus(gui_input_curfocus == GUI_FOCUS_BROWSER);
        gui_msgbar_flush();
}

/**
 * @brief Ask the user to enter a new search string and perform the
 *        first search.
 */
static void
gui_input_search(void)
{
        /* Always ask for a search string */
        if (gui_input_asksearch() != 0)
                return;

        /* Just simulate a 'n' button */
        gui_input_searchnext();
}

/**
 * @brief Ask for a search string and filter matching files in the file
 *        browser.
 */
static void
gui_input_locate(void)
{
        /* Always ask for a search string */
        if (gui_input_asksearch() != 0)
                return;

        /* Perform the serach */
        if (gui_browser_locate(cursearch) != 0)
                gui_msgbar_warn(_("Not found."));
        else
                gui_msgbar_flush();
}

/**
 * @brief Instruct the playlist to seek the current song 5 seconds
 *        backward.
 */
static void
gui_input_cursong_seek_backward(void)
{
        playq_cursong_seek(-5, 1);
}

/**
 * @brief Instruct the playlist to seek the current song 5 seconds
 *        forward.
 */
static void
gui_input_cursong_seek_forward(void)
{
        playq_cursong_seek(5, 1);
}

/**
 * @brief Approve input string format for the seeking option.
 */
static int
gui_input_cursong_seek_validator(const char *str, char c)
{
        const char *s;

        if (c == '+' || c == '-') {
                /* Only allow + and - at the beginning of the statement */
                if (str[0] != '\0')
                        return (-1);
        } else if (c == ':') {
                /* Don't allow : before a digit has been inserted */
                if (strpbrk(str, "0123456789") == NULL)
                        return (-1);

                s = strrchr(str, ':');
                if (s != NULL) {
                        /* Only allow colon after two decimals */
                        if (strlen(s + 1) != 2)
                                return (-1);
                        /* Only allow two : characters in the string */
                        if (s - strchr(str, ':') == 3)
                                return (-1);
                }
        } else if (g_ascii_isdigit(c)) {
                s = strrchr(str, ':');
                if (s != NULL) {
                        /* Only allow up to two decimals after a colon */
                        if (strlen(s + 1) == 2)
                                return (-1);
                        /* Only allow '0' to '5' as the first digit */
                        if (s[1] == '\0' && c > '5')
                                return (-1);
                }
        } else {
                /* Don't allow any other characters */
                return (-1);
        }

        return (0);
}

/**
 * @brief Ask the user to specify a position to seek the current song to.
 */
static void
gui_input_cursong_seek_jump(void)
{
        char *str, *t;
        int total = 0, split = 0, digit = 0, value, relative = 0;

        str = gui_input_askstring(_("Jump to position"), curseek,
            gui_input_cursong_seek_validator);
        if (str == NULL)
                return;

        for (t = str; *t != '\0'; t++) {
                switch (*t) {
                case ':':
                        /*
                         * Only allow two :'s, not without a prepending
                         * digit. :'s must be interleaved with two
                         * digits.
                         */
                        g_assert(split <= 1 && digit != 0);
                        g_assert(split == 0 || digit == 2);
                        split++;
                        digit = 0;
                        break;
                case '+':
                        /* Must be at the beginning */
                        g_assert(t == str);
                        relative = 1;
                        break;
                case '-':
                        /* Must be at the beginning */
                        g_assert(t == str);
                        relative = -1;
                        break;
                default:
                        /* Regular digit */
                        value = g_ascii_digit_value(*t);
                        g_assert(value != -1);
                        g_assert(split == 0 || digit != 0 || value <= 5);

                        total *= (digit == 0) ? 6 : 10;
                        total += value;
                        digit++;
                }
        }

        /* Not enough trailing digits */
        if (split > 0 && digit != 2)
                goto bad;

        if (relative != 0) {
                total *= relative;
                if (total == 0)
                        goto bad;
        }
        playq_cursong_seek(total, relative);

        /* Show the string the next time as well */
        g_free(curseek);
        curseek = str;
        return;

bad:    gui_msgbar_warn(_("Bad time format."));
        g_free(str);
}

/**
 * @brief A simple binding from a keyboard character input to a function.
 */
struct gui_binding {
        /**
         * @brief The window that should be focussed.
         */
        int focus;
        /**
         * @brief The character that should be pressed. 
         */
        int input;
        /**
         * @brief The function that will be run.
         */
        void (*func)(void);
};

/**
 * @brief List of keybindings available in the GUI.
 */
static struct gui_binding kbdbindings[] = {
        /* Application-wide keyboard bindings */
#ifdef BUILD_VOLUME
        { -1, '(',                      gui_playq_volume_down },
        { -1, ')',                      gui_playq_volume_up },
#endif /* BUILD_VOLUME */
        { -1, '<',                      gui_input_cursong_seek_backward },
        { -1, '>',                      gui_input_cursong_seek_forward },
        { -1, 'a',                      gui_browser_playq_add_after },
        { -1, 'A',                      gui_browser_playq_add_tail },
        { -1, 'b',                      playq_cursong_next },
        { -1, 'c',                      playq_cursong_pause },
        { -1, 'C',                      gui_browser_chdir },
        { -1, 'd',                      gui_playq_song_remove },
        { -1, 'D',                      gui_playq_song_remove_all },
        { -1, 'h',                      gui_browser_dir_parent },
        { -1, 'i',                      gui_browser_playq_add_before },
        { -1, 'I',                      gui_browser_playq_add_head },
        { -1, 'J',                      gui_input_cursong_seek_jump },
        { -1, 'l',                      gui_browser_dir_enter },
        { -1, 'L',                      gui_input_locate },
        { -1, 'q',                      gui_input_askquit },
        { -1, 'r',                      playq_repeat_toggle },
        { -1, 'R',                      gui_playq_song_randomize },
        { -1, 'v',                      playq_cursong_stop },
        { -1, 'w',                      gui_browser_write_playlist },
        { -1, 'x',                      gui_playq_song_select },
        { -1, 'z',                      playq_cursong_prev },
        { -1, '[',                      gui_playq_song_move_up },
        { -1, ']',                      gui_playq_song_move_down },
        { -1, '{',                      gui_playq_song_move_head },
        { -1, '}',                      gui_playq_song_move_tail },
        { -1, '\t',                     gui_input_switchfocus },
        { -1, CTRL('W'),                gui_input_switchfocus },
        { -1, '/',                      gui_input_search },
        { -1, 'n',                      gui_input_searchnext },
        { -1, KEY_LEFT,                 gui_browser_dir_parent },
        { -1, KEY_RIGHT,                gui_browser_dir_enter },

        /* Keyboard bindings for the file browser */
        { GUI_FOCUS_BROWSER, ' ',       gui_browser_cursor_pagedown },
        { GUI_FOCUS_BROWSER, 'F',       gui_browser_gotofolder },
        { GUI_FOCUS_BROWSER, 'f',       gui_browser_fullpath },
        { GUI_FOCUS_BROWSER, 'G',       gui_browser_cursor_tail },
        { GUI_FOCUS_BROWSER, 'g',       gui_browser_cursor_head },
        { GUI_FOCUS_BROWSER, 'j',       gui_browser_cursor_down },
        { GUI_FOCUS_BROWSER, 'k',       gui_browser_cursor_up },
        { GUI_FOCUS_BROWSER, CTRL('B'), gui_browser_cursor_pageup },
        { GUI_FOCUS_BROWSER, CTRL('F'), gui_browser_cursor_pagedown },
        { GUI_FOCUS_BROWSER, KEY_DOWN,  gui_browser_cursor_down },
        { GUI_FOCUS_BROWSER, KEY_END,   gui_browser_cursor_tail },
        { GUI_FOCUS_BROWSER, KEY_HOME,  gui_browser_cursor_head },
        { GUI_FOCUS_BROWSER, KEY_NPAGE, gui_browser_cursor_pagedown },
        { GUI_FOCUS_BROWSER, KEY_PPAGE, gui_browser_cursor_pageup },
        { GUI_FOCUS_BROWSER, KEY_UP,    gui_browser_cursor_up },

        /* Keyboard bindings for the playlist */
        { GUI_FOCUS_PLAYQ, ' ',         gui_playq_cursor_pagedown },
        { GUI_FOCUS_PLAYQ, 'F',         gui_playq_gotofolder },
        { GUI_FOCUS_PLAYQ, 'f',         gui_playq_fullpath },
        { GUI_FOCUS_PLAYQ, 'G',         gui_playq_cursor_tail },
        { GUI_FOCUS_PLAYQ, 'g',         gui_playq_cursor_head },
        { GUI_FOCUS_PLAYQ, 'j',         gui_playq_cursor_down },
        { GUI_FOCUS_PLAYQ, 'k',         gui_playq_cursor_up },
        { GUI_FOCUS_PLAYQ, CTRL('B'),   gui_playq_cursor_pageup },
        { GUI_FOCUS_PLAYQ, CTRL('F'),   gui_playq_cursor_pagedown },
        { GUI_FOCUS_PLAYQ, KEY_DOWN,    gui_playq_cursor_down },
        { GUI_FOCUS_PLAYQ, KEY_END,     gui_playq_cursor_tail },
        { GUI_FOCUS_PLAYQ, KEY_HOME,    gui_playq_cursor_head },
        { GUI_FOCUS_PLAYQ, KEY_NPAGE,   gui_playq_cursor_pagedown },
        { GUI_FOCUS_PLAYQ, KEY_PPAGE,   gui_playq_cursor_pageup },
        { GUI_FOCUS_PLAYQ, KEY_UP,      gui_playq_cursor_up },
};
/**
 * @brief Amount of keybindings.
 */
#define NUM_BINDINGS (sizeof kbdbindings / sizeof(struct gui_binding))

void
gui_input_sigmask(void)
{
#ifdef G_THREADS_IMPL_POSIX
        sigset_t sset;

        sigemptyset(&sset);
        sigaddset(&sset, SIGHUP);
        sigaddset(&sset, SIGINT);
        sigaddset(&sset, SIGPIPE);
        sigaddset(&sset, SIGQUIT);
        sigaddset(&sset, SIGTERM);
#ifdef SIGWINCH
        sigaddset(&sset, SIGWINCH);
#endif /* SIGWINCH */
        pthread_sigmask(SIG_BLOCK, &sset, NULL);
#endif /* G_THREADS_IMPL_POSIX */
}

#ifdef G_OS_UNIX
/**
 * @brief Handler of all incoming signals with a custom action.
 */
static void
gui_input_sighandler(int signal)
{
        if (shutting_down)
                return;

        switch (signal) {
        case SIGHUP:
        case SIGINT:
        case SIGPIPE:
        case SIGQUIT:
        case SIGTERM:
                gui_input_quit();
                g_assert_not_reached();
        }
}
#endif /* G_OS_UNIX */

void
gui_input_loop(void)
{
        int ch;
        unsigned int i;

#ifdef G_OS_UNIX
        signal(SIGHUP, gui_input_sighandler);
        signal(SIGINT, gui_input_sighandler);
        signal(SIGPIPE, gui_input_sighandler);
        signal(SIGQUIT, gui_input_sighandler);
        signal(SIGTERM, gui_input_sighandler);
#endif /* G_OS_UNIX */

        for (;;) {
                ch = gui_input_getch();
                gui_msgbar_flush();

                for (i = 0; i < NUM_BINDINGS; i++) {
                        /* Let's see if the button matches */
                        if (kbdbindings[i].input != ch ||
                            (kbdbindings[i].focus != -1 &&
                             kbdbindings[i].focus != gui_input_curfocus))
                                continue;

#ifdef BUILD_DBUS
                        dbus_lock();
                        kbdbindings[i].func();
                        dbus_unlock();
#else /* !BUILD_DBUS */
                        kbdbindings[i].func();
#endif /* BUILD_DBUS */
                        break;
                }

                gui_draw_done();
        }
}

int
gui_input_askyesno(const char *question)
{
        char *msg, input;
        const char *yes, *no;
        int ret;

        /* Skip the question if the user really wants so */
        if (!config_getopt_bool("gui.input.confirm"))
                return (0);

        yes = _("yes");
        no = _("no");

        /* Print the question on screen */
        msg = g_strdup_printf("%s ([%s]/%s): ", question, yes, no);
        gui_msgbar_ask(msg);
        g_free(msg);

        for (;;) {
                input = gui_input_getch();

#ifdef BUILD_NLS
                /* Localized yes/no buttons */
                if (input == yes[0]) {
                        ret = 0;
                        goto done;
                } else if (input == no[0]) {
                        ret = -1;
                        goto done;
                }
#endif /* BUILD_NLS */

                /* Default y/n behaviour */
                switch (input) {
                case 'y':
                case 'Y':
                case '\r':
                        ret = 0;
                        goto done;
                case CTRL('['):
                case 'n':
                case 'N':
                case CTRL('C'):
                        ret = -1;
                        goto done;
                }
        }
done:
        gui_msgbar_flush();
        return (ret);
}

/**
 * @brief Find the offset to where a string should be trimmed to remove
 *        one word or special character sequence, including trailing
 *        whitespace.
 */
static int
gui_input_trimword(GString *gs)
{
        const char *end;

        /* Last character */
        end = (gs->str + gs->len) - 1;

        /* Trim as much trailing whitespace as possible */
        for (;;) {
                if (end < gs->str) return (0);
                if (!isspace(*end)) break;
                end--;
        }

        if (isalnum(*end)) {
                /* Trim alphanumerics */
                do {
                        if (--end < gs->str) return (0);
                } while (isalnum(*end));
        } else {
                /* Trim special characters */
                do {
                        if (--end < gs->str) return (0);
                } while (!isalnum(*end) && !isspace(*end));
        }

        return (end - gs->str) + 1;
}

char *
gui_input_askstring(const char *question, const char *defstr,
    int (*validator)(const char *str, char c))
{
        GString *msg;
        unsigned int origlen, newlen;
        int c, clearfirst = 0;
        char *ret = NULL;
        const char *vstr;

        msg = g_string_new(question);
        g_string_append(msg, ": ");
        origlen = msg->len;
        if (defstr != NULL) {
                g_string_append(msg, defstr);
                clearfirst = 1;
        }

        for(;;) {
                gui_msgbar_ask(msg->str);

                switch (c = gui_input_getch()) {
                case '\r':
                        goto done;
                case KEY_BACKSPACE:
                        clearfirst = 0;
                        if (msg->len > origlen) {
                                /* Prompt has contents */
                                g_string_truncate(msg, msg->len - 1);
                        }
                        break;
                case CTRL('C'):
                case CTRL('['):
                        /* Just empty the return */
                        g_string_truncate(msg, origlen);
                        goto done;
                case CTRL('U'):
                        g_string_truncate(msg, origlen);
                        break;
                case CTRL('W'):
                        clearfirst = 0;
                        newlen = gui_input_trimword(msg);
                        g_string_truncate(msg, MAX(newlen, origlen));
                        break;
                default:
                        /* Control characters are not allowed */
                        if (g_ascii_iscntrl(c))
                                break;

                        if (validator != NULL) {
                                vstr = clearfirst ? "" : msg->str + origlen;
                                if (validator(vstr, c) != 0)
                                        break;
                        }
                        if (clearfirst) {
                                g_string_truncate(msg, origlen);
                                clearfirst = 0;
                        }
                        g_string_append_c(msg, c);
                }
        }

done:
        gui_msgbar_flush();

        /* Only return a string when there are contents */
        if (msg->len > origlen)
                ret = g_strdup(msg->str + origlen);

        g_string_free(msg, TRUE);
        return ret;
}