zathura.c

/* See LICENSE file for license and copyright information */

#define _BSD_SOURCE
#define _XOPEN_SOURCE 500

#include <regex.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>
#include <math.h>

#include <poppler/glib/poppler.h>
#include <cairo.h>

#include <glib/gstdio.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>

/* macros */
#define LENGTH(x) (sizeof(x)/sizeof((x)[0]))
#define CLEAN(m) (m & ~(GDK_MOD2_MASK) & ~(GDK_BUTTON1_MASK) & ~(GDK_BUTTON2_MASK) & ~(GDK_BUTTON3_MASK) & ~(GDK_BUTTON4_MASK) & ~(GDK_BUTTON5_MASK) & ~(GDK_LEAVE_NOTIFY_MASK))
#if defined(__GNUC__) || defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC) || defined(__clang__)
/* only gcc, clang and Intel's cc seem support this */
#define NORETURN __attribute__((noreturn))
#else
#define NORETURN
#endif

// just remove the #if-#define-#endif block if support for poppler versions
// before 0.15 is dropped
#if !POPPLER_CHECK_VERSION(0,15,0)
#define poppler_page_get_selected_text poppler_page_get_text
#endif

/* enums */
enum { NEXT, PREVIOUS, LEFT, RIGHT, UP, DOWN, BOTTOM, TOP, HIDE, HIGHLIGHT,
  DELETE_LAST_WORD, DELETE_LAST_CHAR, DEFAULT, ERROR, WARNING, NEXT_GROUP,
  PREVIOUS_GROUP, ZOOM_IN, ZOOM_OUT, ZOOM_ORIGINAL, ZOOM_SPECIFIC, FORWARD,
  BACKWARD, ADJUST_BESTFIT, ADJUST_WIDTH, ADJUST_NONE, CONTINUOUS, DELETE_LAST,
  ADD_MARKER, EVAL_MARKER, EXPAND, COLLAPSE, SELECT, GOTO_DEFAULT, GOTO_LABELS,
  GOTO_OFFSET, HALF_UP, HALF_DOWN, FULL_UP, FULL_DOWN, NEXT_CHAR, PREVIOUS_CHAR,
  DELETE_TO_LINE_START, APPEND_FILEPATH, NO_SEARCH };

/* define modes */
#define ALL        (1 << 0)
#define FULLSCREEN (1 << 1)
#define INDEX      (1 << 2)
#define NORMAL     (1 << 3)

/* typedefs */
struct CElement
{
  char            *value;
  char            *description;
  struct CElement *next;
};

typedef struct CElement CompletionElement;

struct CGroup
{
  char              *value;
  CompletionElement *elements;
  struct CGroup     *next;
};

typedef struct CGroup CompletionGroup;

typedef struct
{
  CompletionGroup* groups;
} Completion;

typedef struct
{
  char*      command;
  char*      description;
  int        command_id;
  gboolean   is_group;
  GtkWidget* row;
} CompletionRow;

typedef struct
{
  int   n;
  void *data;
} Argument;

typedef struct
{
  char* name;
  int argument;
} ArgumentName;

typedef struct
{
  int mask;
  int key;
  void (*function)(Argument*);
  int mode;
  Argument argument;
} Shortcut;

typedef struct
{
  char* name;
  int   mode;
  char* display;
} ModeName;

typedef struct
{
  char* name;
  void (*function)(Argument*);
} ShortcutName;

typedef struct
{
  int mask;
  int key;
  void (*function)(Argument*);
  Argument argument;
} InputbarShortcut;

typedef struct
{
  int direction;
  void (*function)(Argument*);
  Argument argument;
} MouseScrollEvent;

typedef struct
{
  char* command;
  char* abbr;
  gboolean (*function)(int, char**);
  Completion* (*completion)(char*);
  char* description;
} Command;

typedef struct
{
  char* regex;
  void (*function)(char*, Argument*);
  Argument argument;
} BufferCommand;

typedef struct
{
  char identifier;
  gboolean (*function)(char*, Argument*);
  int always;
  Argument argument;
} SpecialCommand;

struct SCList
{
  Shortcut       element;
  struct SCList *next;
};

typedef struct SCList ShortcutList;

typedef struct
{
  char* identifier;
  int   key;
} GDKKey;

typedef struct
{
  PopplerPage *page;
  int          id;
  char        *label;
} Page;

typedef struct
{
  char* name;
  void* variable;
  char  type;
  gboolean render;
  gboolean reinit;
  char* description;
} Setting;

typedef struct
{
  int id;
  int page;
} Marker;

typedef struct
{
  char* id;
  int page;
} Bookmark;

/* zathura */
struct
{
  struct
  {
    GtkWidget         *window;
    GtkBox            *box;
    GtkBox            *continuous;
    GtkScrolledWindow *view;
    GtkViewport       *viewport;
    GtkWidget         *statusbar;
    GtkBox            *statusbar_entries;
    GtkEntry          *inputbar;
    GtkWidget         *index;
    GtkWidget         *information;
    GtkWidget         *drawing_area;
    GtkWidget         *document;
    GdkNativeWindow    embed;
  } UI;

  struct
  {
    GdkColor default_fg;
    GdkColor default_bg;
    GdkColor inputbar_fg;
    GdkColor inputbar_bg;
    GdkColor statusbar_fg;
    GdkColor statusbar_bg;
    GdkColor completion_fg;
    GdkColor completion_bg;
    GdkColor completion_g_bg;
    GdkColor completion_g_fg;
    GdkColor completion_hl_fg;
    GdkColor completion_hl_bg;
    GdkColor notification_e_fg;
    GdkColor notification_e_bg;
    GdkColor notification_w_fg;
    GdkColor notification_w_bg;
    GdkColor recolor_darkcolor;
    GdkColor recolor_lightcolor;
    GdkColor search_highlight;
    GdkColor select_text;
    PangoFontDescription *font;
  } Style;

  struct
  {
    GtkLabel *status_text;
    GtkLabel *status_buffer;
    GtkLabel *status_state;
    GString  *buffer;
    GList    *history;
    int       mode;
    int       viewing_mode;
    gboolean  recolor;
    gboolean  enable_labelmode;
    int       goto_mode;
    int       adjust_mode;
    gboolean  show_index;
    gboolean  show_statusbar;
    gboolean  show_inputbar;
  } Global;

  struct
  {
    ShortcutList  *sclist;
  } Bindings;

  struct
  {
    gdouble x;
    gdouble y;
  } SelectPoint;

  struct
  {
    char* filename;
    char* pages;
    int scroll_percentage;
  } State;

  struct
  {
    Marker* markers;
    int number_of_markers;
    int last;
  } Marker;

  struct
  {
    GFileMonitor* monitor;
    GFile*        file;
  } FileMonitor;

  struct
  {
    GKeyFile *data;
    char     *file;
    Bookmark *bookmarks;
    int       number_of_bookmarks;
  } Bookmarks;

  struct
  {
    PopplerDocument *document;
    char            *file;
    char            *password;
    Page           **pages;
    int              page_number;
    int              page_offset;
    int              number_of_pages;
    int              scale;
    int              rotate;
    cairo_surface_t *surface;
  } PDF;

  struct
  {
    GStaticMutex pdflib_lock;
    GStaticMutex pdf_obj_lock;
    GStaticMutex search_lock;
    GStaticMutex select_lock;
  } Lock;

  struct
  {
    GList* results;
    int page;
    gboolean draw;
    gchar* query;
  } Search;

  struct
  {
    GThread* search_thread;
    gboolean search_thread_running;
    GThread* inotify_thread;
  } Thread;

  struct
  {
    guint inputbar_activate;
    guint inputbar_key_press_event;
  } Handler;

  struct
  {
    gchar* config_dir;
    gchar* data_dir;
  } Config;

  struct
  {
    gchar* file;
  } StdinSupport;
} Zathura;


/* function declarations */
void init_look(void);
void init_directories(void);
void init_bookmarks(void);
void init_keylist(void);
void init_settings(void);
void init_zathura(void);
void add_marker(int);
void build_index(GtkTreeModel*, GtkTreeIter*, PopplerIndexIter*);
void change_mode(int);
void calculate_offset(GtkWidget*, double*, double*);
void close_file(gboolean);
void enter_password(void);
void highlight_result(int, PopplerRectangle*);
void draw(int);
void eval_marker(int);
void notify(int, const char*);
gboolean open_file(char*, char*);
gboolean open_stdin(gchar*);
void open_uri(char*);
void out_of_memory(void) NORETURN;
void update_status(void);
void read_bookmarks_file(void);
void read_configuration_file(const char*);
void read_configuration(void);
void recalc_rectangle(int, PopplerRectangle*);
void set_completion_row_color(GtkBox*, int, int);
void set_page(int);
void switch_view(GtkWidget*);
GtkEventBox* create_completion_row(GtkBox*, char*, char*, gboolean);
gchar* fix_path(const gchar*);
gchar* path_from_env(const gchar*);
gchar* get_home_dir(void);

Completion* completion_init(void);
CompletionGroup* completion_group_create(char*);
void completion_add_group(Completion*, CompletionGroup*);
void completion_free(Completion*);
void completion_group_add_element(CompletionGroup*, char*, char*);

/* thread declaration */
void* search(void*);

/* shortcut declarations */
void sc_abort(Argument*);
void sc_adjust_window(Argument*);
void sc_change_buffer(Argument*);
void sc_change_mode(Argument*);
void sc_focus_inputbar(Argument*);
void sc_follow(Argument*);
void sc_navigate(Argument*);
void sc_recolor(Argument*);
void sc_reload(Argument*);
void sc_rotate(Argument*);
void sc_scroll(Argument*);
void sc_search(Argument*);
void sc_switch_goto_mode(Argument*);
void sc_navigate_index(Argument*);
void sc_toggle_index(Argument*);
void sc_toggle_inputbar(Argument*);
void sc_toggle_fullscreen(Argument*);
void sc_toggle_statusbar(Argument*);
void sc_quit(Argument*);
void sc_zoom(Argument*);

/* inputbar shortcut declarations */
void isc_abort(Argument*);
void isc_command_history(Argument*);
void isc_completion(Argument*);
void isc_string_manipulation(Argument*);

/* command declarations */
gboolean cmd_bookmark(int, char**);
gboolean cmd_open_bookmark(int, char**);
gboolean cmd_close(int, char**);
gboolean cmd_correct_offset(int, char**);
gboolean cmd_delete_bookmark(int, char**);
gboolean cmd_export(int, char**);
gboolean cmd_info(int, char**);
gboolean cmd_map(int, char**);
gboolean cmd_open(int, char**);
gboolean cmd_print(int, char**);
gboolean cmd_rotate(int, char**);
gboolean cmd_set(int, char**);
gboolean cmd_quit(int, char**);
gboolean cmd_save(int, char**);
gboolean cmd_savef(int, char**);

/* completion commands */
Completion* cc_bookmark(char*);
Completion* cc_export(char*);
Completion* cc_open(char*);
Completion* cc_print(char*);
Completion* cc_set(char*);

/* buffer command declarations */
void bcmd_evalmarker(char*, Argument*);
void bcmd_goto(char*, Argument*);
void bcmd_scroll(char*, Argument*);
void bcmd_setmarker(char*, Argument*);
void bcmd_zoom(char*, Argument*);

/* special command delcarations */
gboolean scmd_search(gchar*, Argument*);

/* callback declarations */
gboolean cb_destroy(GtkWidget*, gpointer);
gboolean cb_draw(GtkWidget*, GdkEventExpose*, gpointer);
gboolean cb_index_row_activated(GtkTreeView*, GtkTreePath*, GtkTreeViewColumn*, gpointer);
gboolean cb_inputbar_kb_pressed(GtkWidget*, GdkEventKey*, gpointer);
gboolean cb_inputbar_activate(GtkEntry*, gpointer);
gboolean cb_inputbar_form_activate(GtkEntry*, gpointer);
gboolean cb_inputbar_password_activate(GtkEntry*, gpointer);
gboolean cb_view_kb_pressed(GtkWidget*, GdkEventKey*, gpointer);
gboolean cb_view_resized(GtkWidget*, GtkAllocation*, gpointer);
gboolean cb_view_button_pressed(GtkWidget*, GdkEventButton*, gpointer);
gboolean cb_view_button_release(GtkWidget*, GdkEventButton*, gpointer);
gboolean cb_view_motion_notify(GtkWidget*, GdkEventMotion*, gpointer);
gboolean cb_view_scrolled(GtkWidget*, GdkEventScroll*, gpointer);
gboolean cb_watch_file(GFileMonitor*, GFile*, GFile*, GFileMonitorEvent, gpointer);

/* configuration */
#include "config.h"

/* function implementation */
void
init_look(void)
{
  /* parse  */
  gdk_color_parse(default_fgcolor,        &(Zathura.Style.default_fg));
  gdk_color_parse(default_bgcolor,        &(Zathura.Style.default_bg));
  gdk_color_parse(inputbar_fgcolor,       &(Zathura.Style.inputbar_fg));
  gdk_color_parse(inputbar_bgcolor,       &(Zathura.Style.inputbar_bg));
  gdk_color_parse(statusbar_fgcolor,      &(Zathura.Style.statusbar_fg));
  gdk_color_parse(statusbar_bgcolor,      &(Zathura.Style.statusbar_bg));
  gdk_color_parse(completion_fgcolor,     &(Zathura.Style.completion_fg));
  gdk_color_parse(completion_bgcolor,     &(Zathura.Style.completion_bg));
  gdk_color_parse(completion_g_fgcolor,   &(Zathura.Style.completion_g_fg));
  gdk_color_parse(completion_g_fgcolor,   &(Zathura.Style.completion_g_fg));
  gdk_color_parse(completion_hl_fgcolor,  &(Zathura.Style.completion_hl_fg));
  gdk_color_parse(completion_hl_bgcolor,  &(Zathura.Style.completion_hl_bg));
  gdk_color_parse(notification_e_fgcolor, &(Zathura.Style.notification_e_fg));
  gdk_color_parse(notification_e_bgcolor, &(Zathura.Style.notification_e_bg));
  gdk_color_parse(notification_w_fgcolor, &(Zathura.Style.notification_w_fg));
  gdk_color_parse(notification_w_bgcolor, &(Zathura.Style.notification_w_bg));
  gdk_color_parse(recolor_darkcolor,      &(Zathura.Style.recolor_darkcolor));
  gdk_color_parse(recolor_lightcolor,     &(Zathura.Style.recolor_lightcolor));
  gdk_color_parse(search_highlight,       &(Zathura.Style.search_highlight));
  gdk_color_parse(select_text,            &(Zathura.Style.select_text));

  pango_font_description_free(Zathura.Style.font);
  Zathura.Style.font = pango_font_description_from_string(font);

  /* window and viewport */
  gtk_widget_modify_bg(GTK_WIDGET(Zathura.UI.window),   GTK_STATE_NORMAL, &(Zathura.Style.default_bg));
  gtk_widget_modify_bg(GTK_WIDGET(Zathura.UI.viewport), GTK_STATE_NORMAL, &(Zathura.Style.default_bg));

  /* drawing area */
  gtk_widget_modify_bg(GTK_WIDGET(Zathura.UI.drawing_area), GTK_STATE_NORMAL, &(Zathura.Style.default_bg));

  /* statusbar */
  gtk_widget_modify_bg(GTK_WIDGET(Zathura.UI.statusbar), GTK_STATE_NORMAL, &(Zathura.Style.statusbar_bg));

  gtk_widget_modify_fg(GTK_WIDGET(Zathura.Global.status_text),  GTK_STATE_NORMAL, &(Zathura.Style.statusbar_fg));
  gtk_widget_modify_fg(GTK_WIDGET(Zathura.Global.status_state), GTK_STATE_NORMAL, &(Zathura.Style.statusbar_fg));
  gtk_widget_modify_fg(GTK_WIDGET(Zathura.Global.status_buffer), GTK_STATE_NORMAL, &(Zathura.Style.statusbar_fg));

  gtk_widget_modify_font(GTK_WIDGET(Zathura.Global.status_text),  Zathura.Style.font);
  gtk_widget_modify_font(GTK_WIDGET(Zathura.Global.status_state), Zathura.Style.font);
  gtk_widget_modify_font(GTK_WIDGET(Zathura.Global.status_buffer), Zathura.Style.font);

  /* inputbar */
  gtk_widget_modify_base(GTK_WIDGET(Zathura.UI.inputbar), GTK_STATE_NORMAL, &(Zathura.Style.inputbar_bg));
  gtk_widget_modify_text(GTK_WIDGET(Zathura.UI.inputbar), GTK_STATE_NORMAL, &(Zathura.Style.inputbar_fg));
  gtk_widget_modify_font(GTK_WIDGET(Zathura.UI.inputbar),                     Zathura.Style.font);

  g_object_set(G_OBJECT(Zathura.UI.inputbar), "has-frame", FALSE, NULL);

  /* scrollbars */
  if(show_scrollbars)
    gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(Zathura.UI.view), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
  else
    gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(Zathura.UI.view), GTK_POLICY_NEVER, GTK_POLICY_NEVER);

  /* inputbar */
  if(Zathura.Global.show_inputbar)
    gtk_widget_show(GTK_WIDGET(Zathura.UI.inputbar));
  else
    gtk_widget_hide(GTK_WIDGET(Zathura.UI.inputbar));

  /* statusbar */
  if(Zathura.Global.show_statusbar)
    gtk_widget_show(GTK_WIDGET(Zathura.UI.statusbar));
  else
    gtk_widget_hide(GTK_WIDGET(Zathura.UI.statusbar));
}

gchar*
fix_path(const gchar* path)
{
  if (!path)
    return NULL;

  if (path[0] == '~')
  {
    gchar* home_path = get_home_dir();
    gchar* res = g_build_filename(home_path, path + 1, NULL);
    g_free(home_path);
    return res;
  }
  else
    return g_strdup(path);
}

gchar* path_from_env(const gchar* var)
{
  gchar* env = fix_path(g_getenv(var));
  if (!env)
    return NULL;

  gchar* res = g_build_filename(env, "zathura", NULL);
  g_free(env);
  return res;
}

gchar* get_home_dir(void)
{
  const gchar* homedir = g_getenv("HOME");
  return g_strdup(homedir ? homedir : g_get_home_dir());
}

void
init_directories(void)
{
  /* setup directories */
  if (!Zathura.Config.config_dir)
  {
#ifndef ZATHURA_NO_XDG
    gchar* env = path_from_env("XDG_CONFIG_HOME");
    if (env)
      Zathura.Config.config_dir = env;
    else
#endif
      Zathura.Config.config_dir = fix_path(CONFIG_DIR);
  }
  if (!Zathura.Config.data_dir)
  {
#ifndef ZATHURA_NO_XDG
    gchar* env = path_from_env("XDG_DATA_HOME");
    if (env)
      Zathura.Config.data_dir = env;
    else
#endif
      Zathura.Config.data_dir = fix_path(DATA_DIR);
  }

  /* create zathura (config/data) directory */
  g_mkdir_with_parents(Zathura.Config.config_dir, 0771);
  g_mkdir_with_parents(Zathura.Config.data_dir,   0771);
}

void
init_bookmarks(void)
{
  /* init variables */
  Zathura.Bookmarks.number_of_bookmarks = 0;
  Zathura.Bookmarks.bookmarks = NULL;

  Zathura.Bookmarks.file = g_build_filename(Zathura.Config.data_dir, BOOKMARK_FILE, NULL);
  read_bookmarks_file();
}

void
init_keylist(void)
{
  ShortcutList* e = NULL;
  ShortcutList* p = NULL;

  int i;
  for(i = 0; i < LENGTH(shortcuts); i++)
  {
    e = malloc(sizeof(ShortcutList));
    if(!e)
      out_of_memory();

    e->element = shortcuts[i];
    e->next    = NULL;

    if(!Zathura.Bindings.sclist)
      Zathura.Bindings.sclist = e;
    if(p)
      p->next = e;

    p = e;
  }
}

void
init_settings(void)
{
  Zathura.State.filename     = g_strdup((char*) default_text);
  Zathura.Global.adjust_mode = adjust_open;

  gtk_window_set_default_size(GTK_WINDOW(Zathura.UI.window), default_width, default_height);
}

void
init_zathura(void)
{
  /* init mutexes */
  g_static_mutex_init(&(Zathura.Lock.pdflib_lock));
  g_static_mutex_init(&(Zathura.Lock.search_lock));
  g_static_mutex_init(&(Zathura.Lock.pdf_obj_lock));
  g_static_mutex_init(&(Zathura.Lock.select_lock));

  /* other */
  Zathura.Global.mode           = NORMAL;
  Zathura.Global.viewing_mode   = NORMAL;
  Zathura.Global.recolor        = 0;
  Zathura.Global.goto_mode      = GOTO_MODE;
  Zathura.Global.show_index     = FALSE;
  Zathura.Global.show_inputbar  = TRUE;
  Zathura.Global.show_statusbar = TRUE;

  Zathura.State.pages             = g_strdup("");
  Zathura.State.scroll_percentage = 0;

  Zathura.Marker.markers           = NULL;
  Zathura.Marker.number_of_markers =  0;
  Zathura.Marker.last              = -1;

  Zathura.Search.results = NULL;
  Zathura.Search.page    = 0;
  Zathura.Search.draw    = FALSE;
  Zathura.Search.query   = NULL;

  Zathura.FileMonitor.monitor = NULL;
  Zathura.FileMonitor.file    = NULL;

  Zathura.StdinSupport.file   = NULL;

  /* window */
  if(Zathura.UI.embed)
    Zathura.UI.window = gtk_plug_new(Zathura.UI.embed);
  else
    Zathura.UI.window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

  /* UI */
  Zathura.UI.box               = GTK_BOX(gtk_vbox_new(FALSE, 0));
  Zathura.UI.continuous        = GTK_BOX(gtk_vbox_new(FALSE, 0));
  Zathura.UI.view              = GTK_SCROLLED_WINDOW(gtk_scrolled_window_new(NULL, NULL));
  Zathura.UI.viewport          = GTK_VIEWPORT(gtk_viewport_new(NULL, NULL));
  Zathura.UI.drawing_area      = gtk_drawing_area_new();
  Zathura.UI.statusbar         = gtk_event_box_new();
  Zathura.UI.statusbar_entries = GTK_BOX(gtk_hbox_new(FALSE, 0));
  Zathura.UI.inputbar          = GTK_ENTRY(gtk_entry_new());
  Zathura.UI.document            = gtk_event_box_new();

  /* window */
  gtk_window_set_title(GTK_WINDOW(Zathura.UI.window), "zathura");
  GdkGeometry hints = { 1, 1 };
  gtk_window_set_geometry_hints(GTK_WINDOW(Zathura.UI.window), NULL, &hints, GDK_HINT_MIN_SIZE);
  g_signal_connect(G_OBJECT(Zathura.UI.window), "destroy", G_CALLBACK(cb_destroy), NULL);

  /* box */
  gtk_box_set_spacing(Zathura.UI.box, 0);
  gtk_container_add(GTK_CONTAINER(Zathura.UI.window), GTK_WIDGET(Zathura.UI.box));

  /* continuous */
  gtk_box_set_spacing(Zathura.UI.continuous, 5);

  /* events */
  gtk_container_add(GTK_CONTAINER(Zathura.UI.document), GTK_WIDGET(Zathura.UI.drawing_area));
  gtk_widget_add_events(GTK_WIDGET(Zathura.UI.document), GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK |
      GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);

  g_signal_connect(G_OBJECT(Zathura.UI.document), "button-press-event",   G_CALLBACK(cb_view_button_pressed), NULL);
  g_signal_connect(G_OBJECT(Zathura.UI.document), "button-release-event", G_CALLBACK(cb_view_button_release), NULL);
  g_signal_connect(G_OBJECT(Zathura.UI.document), "motion-notify-event",  G_CALLBACK(cb_view_motion_notify),  NULL);
  gtk_widget_show(Zathura.UI.document);

  /* view */
  g_signal_connect(G_OBJECT(Zathura.UI.view), "key-press-event",      G_CALLBACK(cb_view_kb_pressed),     NULL);
  g_signal_connect(G_OBJECT(Zathura.UI.view), "size-allocate",        G_CALLBACK(cb_view_resized),        NULL);
  g_signal_connect(G_OBJECT(Zathura.UI.view), "scroll-event",         G_CALLBACK(cb_view_scrolled),       NULL);
  gtk_container_add(GTK_CONTAINER(Zathura.UI.view), GTK_WIDGET(Zathura.UI.viewport));
  gtk_viewport_set_shadow_type(Zathura.UI.viewport, GTK_SHADOW_NONE);

  /* drawing area */
  gtk_widget_show(Zathura.UI.drawing_area);
  g_signal_connect(G_OBJECT(Zathura.UI.drawing_area), "expose-event", G_CALLBACK(cb_draw), NULL);

  /* statusbar */
  Zathura.Global.status_text   = GTK_LABEL(gtk_label_new(NULL));
  Zathura.Global.status_state  = GTK_LABEL(gtk_label_new(NULL));
  Zathura.Global.status_buffer = GTK_LABEL(gtk_label_new(NULL));

  gtk_misc_set_alignment(GTK_MISC(Zathura.Global.status_text),  0.0, 0.0);
  gtk_misc_set_alignment(GTK_MISC(Zathura.Global.status_state), 1.0, 0.0);
  gtk_misc_set_alignment(GTK_MISC(Zathura.Global.status_buffer), 1.0, 0.0);

  gtk_misc_set_padding(GTK_MISC(Zathura.Global.status_text),  2.0, 4.0);
  gtk_misc_set_padding(GTK_MISC(Zathura.Global.status_state), 2.0, 4.0);
  gtk_misc_set_padding(GTK_MISC(Zathura.Global.status_buffer), 2.0, 4.0);

  gtk_label_set_use_markup(Zathura.Global.status_text,  TRUE);
  gtk_label_set_use_markup(Zathura.Global.status_state, TRUE);
  gtk_label_set_use_markup(Zathura.Global.status_buffer, TRUE);

  gtk_box_pack_start(Zathura.UI.statusbar_entries, GTK_WIDGET(Zathura.Global.status_text),  TRUE,  TRUE,  2);
  gtk_box_pack_start(Zathura.UI.statusbar_entries, GTK_WIDGET(Zathura.Global.status_buffer), FALSE, FALSE, 2);
  gtk_box_pack_start(Zathura.UI.statusbar_entries, GTK_WIDGET(Zathura.Global.status_state), FALSE, FALSE, 2);

  gtk_container_add(GTK_CONTAINER(Zathura.UI.statusbar), GTK_WIDGET(Zathura.UI.statusbar_entries));

  /* inputbar */
  gtk_entry_set_inner_border(Zathura.UI.inputbar, NULL);
  gtk_entry_set_has_frame(   Zathura.UI.inputbar, FALSE);
  gtk_editable_set_editable( GTK_EDITABLE(Zathura.UI.inputbar), TRUE);

  Zathura.Handler.inputbar_key_press_event =
    g_signal_connect(G_OBJECT(Zathura.UI.inputbar), "key-press-event",   G_CALLBACK(cb_inputbar_kb_pressed), NULL);
  Zathura.Handler.inputbar_activate =
    g_signal_connect(G_OBJECT(Zathura.UI.inputbar), "activate",          G_CALLBACK(cb_inputbar_activate),   NULL);

  /* packing */
  gtk_box_pack_start(Zathura.UI.box, GTK_WIDGET(Zathura.UI.view),      TRUE,  TRUE,  0);
  gtk_box_pack_start(Zathura.UI.box, GTK_WIDGET(Zathura.UI.statusbar), FALSE, FALSE, 0);
  gtk_box_pack_end(  Zathura.UI.box, GTK_WIDGET(Zathura.UI.inputbar),  FALSE, FALSE, 0);
}

void
add_marker(int id)
{
  if( (id < 0x30) || (id > 0x7A))
    return;

  /* current information */
  int page_number = Zathura.PDF.page_number;

  /* search if entry already exists */
  int i;
  for(i = 0; i < Zathura.Marker.number_of_markers; i++)
  {
    if(Zathura.Marker.markers[i].id == id)
    {
      Zathura.Marker.markers[i].page = page_number;
      Zathura.Marker.last            = page_number;
      return;
    }
  }

  /* add new marker */
  int marker_index = Zathura.Marker.number_of_markers++;
  Zathura.Marker.markers = realloc(Zathura.Marker.markers, sizeof(Marker) *
      (Zathura.Marker.number_of_markers));

  Zathura.Marker.markers[marker_index].id   = id;
  Zathura.Marker.markers[marker_index].page = page_number;
  Zathura.Marker.last                       = page_number;
}

void
build_index(GtkTreeModel* model, GtkTreeIter* parent, PopplerIndexIter* index_iter)
{
  do
  {
    GtkTreeIter       tree_iter;
    PopplerIndexIter *child;
    PopplerAction    *action;
    gchar            *markup;

    action = poppler_index_iter_get_action(index_iter);
    if(!action)
      continue;

    markup = g_markup_escape_text (action->any.title, -1);

    gtk_tree_store_append(GTK_TREE_STORE(model), &tree_iter, parent);
    gtk_tree_store_set(GTK_TREE_STORE(model), &tree_iter, 0, markup, 1, action, -1);
    g_object_weak_ref(G_OBJECT(model), (GWeakNotify) poppler_action_free, action);
    g_free(markup);

    child = poppler_index_iter_get_child(index_iter);
    if(child)
      build_index(model, &tree_iter, child);
    poppler_index_iter_free(child);
  } while(poppler_index_iter_next(index_iter));
}

void
draw(int page_id)
{
  if(!Zathura.PDF.document || page_id < 0 || page_id >= Zathura.PDF.number_of_pages)
    return;

  double page_width, page_height;
  double width, height;

  double scale = ((double) Zathura.PDF.scale / 100.0);

  int rotate = Zathura.PDF.rotate;

  Page *current_page = Zathura.PDF.pages[page_id];

  if(Zathura.PDF.surface)
    cairo_surface_destroy(Zathura.PDF.surface);
  Zathura.PDF.surface = NULL;

  g_static_mutex_lock(&(Zathura.Lock.pdflib_lock));
  poppler_page_get_size(current_page->page, &page_width, &page_height);
  g_static_mutex_unlock(&(Zathura.Lock.pdflib_lock));

  if(rotate == 0 || rotate == 180)
  {
    width  = page_width  * scale;
    height = page_height * scale;
  }
  else
  {
    width  = page_height * scale;
    height = page_width  * scale;
  }

  cairo_t *cairo;
  Zathura.PDF.surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);
  cairo = cairo_create(Zathura.PDF.surface);

  cairo_save(cairo);
  cairo_set_source_rgb(cairo, 1, 1, 1);
  cairo_rectangle(cairo, 0, 0, width, height);
  cairo_fill(cairo);
  cairo_restore(cairo);
  cairo_save(cairo);

  switch(rotate)
  {
    case 90:
      cairo_translate(cairo, width, 0);
      break;
    case 180:
      cairo_translate(cairo, width, height);
      break;
    case 270:
      cairo_translate(cairo, 0, height);
      break;
    default:
      cairo_translate(cairo, 0, 0);
  }

  if(scale != 1.0)
    cairo_scale(cairo, scale, scale);

  if(rotate != 0)
    cairo_rotate(cairo, rotate * G_PI / 180.0);

  g_static_mutex_lock(&(Zathura.Lock.pdflib_lock));
  poppler_page_render(current_page->page, cairo);
  g_static_mutex_unlock(&(Zathura.Lock.pdflib_lock));

  cairo_restore(cairo);
  cairo_destroy(cairo);

  if(Zathura.Global.recolor)
  {
    unsigned char* image = cairo_image_surface_get_data(Zathura.PDF.surface);
    int x, y;

    int width     = cairo_image_surface_get_width(Zathura.PDF.surface);
    int height    = cairo_image_surface_get_height(Zathura.PDF.surface);
    int rowstride = cairo_image_surface_get_stride(Zathura.PDF.surface);

    /* recolor code based on qimageblitz library flatten() function
    (http://sourceforge.net/projects/qimageblitz/) */

    int r1 = Zathura.Style.recolor_darkcolor.red    / 257;
    int g1 = Zathura.Style.recolor_darkcolor.green  / 257;
    int b1 = Zathura.Style.recolor_darkcolor.blue   / 257;
    int r2 = Zathura.Style.recolor_lightcolor.red   / 257;
    int g2 = Zathura.Style.recolor_lightcolor.green / 257;
    int b2 = Zathura.Style.recolor_lightcolor.blue  / 257;

    int min = 0x00;
    int max = 0xFF;
    int mean;

    float sr = ((float) r2 - r1) / (max - min);
    float sg = ((float) g2 - g1) / (max - min);
    float sb = ((float) b2 - b1) / (max - min);

    for (y = 0; y < height; y++)
    {
      unsigned char* data = image + y * rowstride;

      for (x = 0; x < width; x++)
      {
        mean = (data[0] + data[1] + data[2]) / 3;
        data[2] = sr * (mean - min) + r1 + 0.5;
        data[1] = sg * (mean - min) + g1 + 0.5;
        data[0] = sb * (mean - min) + b1 + 0.5;
        data += 4;
      }
    }
  }

  gtk_widget_set_size_request(Zathura.UI.drawing_area, width, height);
  gtk_widget_queue_draw(Zathura.UI.drawing_area);
}

void
change_mode(int mode)
{
  char* mode_text = 0;
  for(unsigned int i = 0; i != LENGTH(mode_names); ++i)
    if(mode_names[i].mode == mode)
    {
      mode_text = mode_names[i].display;
      break;
    }

  if(!mode_text)
  {
    switch(mode)
    {
      case ADD_MARKER:
        mode_text = "";
        break;
      case EVAL_MARKER:
        mode_text = "";
        break;
      default:
        mode_text = "";
        mode      = NORMAL;
        break;
    }
  }

  Zathura.Global.mode = mode;
  notify(DEFAULT, mode_text);
}

void