add the ability to horizontally scroll half or full screen

config.c

@@ -162,10 +162,14 @@ config_load_default(zathura_t* zathura)
   girara_shortcut_add(gsession, 0,                GDK_KEY_Up,         NULL, sc_scroll,                   NORMAL,     UP,              NULL);
   girara_shortcut_add(gsession, 0,                GDK_KEY_Down,       NULL, sc_scroll,                   NORMAL,     DOWN,            NULL);
   girara_shortcut_add(gsession, 0,                GDK_KEY_Right,      NULL, sc_scroll,                   NORMAL,     RIGHT,           NULL);
+  girara_shortcut_add(gsession, GDK_CONTROL_MASK, GDK_KEY_t,          NULL, sc_scroll,                   NORMAL,     HALF_LEFT,       NULL);
   girara_shortcut_add(gsession, GDK_CONTROL_MASK, GDK_KEY_d,          NULL, sc_scroll,                   NORMAL,     HALF_DOWN,       NULL);
   girara_shortcut_add(gsession, GDK_CONTROL_MASK, GDK_KEY_u,          NULL, sc_scroll,                   NORMAL,     HALF_UP,         NULL);
+  girara_shortcut_add(gsession, GDK_CONTROL_MASK, GDK_KEY_y,          NULL, sc_scroll,                   NORMAL,     HALF_RIGHT,      NULL);
+  girara_shortcut_add(gsession, 0,                GDK_KEY_t,          NULL, sc_scroll,                   NORMAL,     FULL_LEFT,       NULL);
   girara_shortcut_add(gsession, GDK_CONTROL_MASK, GDK_KEY_f,          NULL, sc_scroll,                   NORMAL,     FULL_DOWN,       NULL);
   girara_shortcut_add(gsession, GDK_CONTROL_MASK, GDK_KEY_b,          NULL, sc_scroll,                   NORMAL,     FULL_UP,         NULL);
+  girara_shortcut_add(gsession, 0,                GDK_KEY_y,          NULL, sc_scroll,                   NORMAL,     FULL_RIGHT,      NULL);
   girara_shortcut_add(gsession, 0,                GDK_KEY_space,      NULL, sc_scroll,                   NORMAL,     FULL_DOWN,       NULL);
   girara_shortcut_add(gsession, GDK_SHIFT_MASK,   GDK_KEY_space,      NULL, sc_scroll,                   NORMAL,     FULL_UP,         NULL);
 
@@ -257,6 +261,10 @@ config_load_default(zathura_t* zathura)
   girara_argument_mapping_add(gsession, "full-up",      FULL_UP);
   girara_argument_mapping_add(gsession, "half-down",    HALF_DOWN);
   girara_argument_mapping_add(gsession, "half-up",      HALF_UP);
+  girara_argument_mapping_add(gsession, "full-right",   FULL_RIGHT);
+  girara_argument_mapping_add(gsession, "full-left",    FULL_LEFT);
+  girara_argument_mapping_add(gsession, "half-right",   HALF_RIGHT);
+  girara_argument_mapping_add(gsession, "half-left",    HALF_LEFT);
   girara_argument_mapping_add(gsession, "in",           ZOOM_IN);
   girara_argument_mapping_add(gsession, "left",         LEFT);
   girara_argument_mapping_add(gsession, "next",         NEXT);

shortcuts.c

@@ -423,7 +423,8 @@ sc_scroll(girara_session_t* session, girara_argument_t* argument,
   }
 
   GtkAdjustment* adjustment = NULL;
-  if ( (argument->n == LEFT) || (argument->n == RIGHT) ) {
+  if ( (argument->n == LEFT) || (argument->n == FULL_LEFT) || (argument->n == HALF_LEFT) ||
+	(argument->n == RIGHT) || (argument->n == FULL_RIGHT) || (argument->n == HALF_RIGHT)) {
     adjustment = gtk_scrolled_window_get_hadjustment(GTK_SCROLLED_WINDOW(session->gtk.view));
   } else {
     adjustment = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(session->gtk.view));
@@ -441,15 +442,19 @@ sc_scroll(girara_session_t* session, girara_argument_t* argument,
 
   switch(argument->n) {
     case FULL_UP:
+    case FULL_LEFT:
       new_value = value - view_size - padding;
       break;
     case FULL_DOWN:
+    case FULL_RIGHT:
       new_value = value + view_size + padding;
       break;
     case HALF_UP:
+    case HALF_LEFT:
       new_value = value - ((view_size + padding) / 2);
       break;
     case HALF_DOWN:
+    case HALF_RIGHT:
       new_value = value + ((view_size + padding) / 2);
       break;
     case LEFT:

zathura.1.rst

@@ -49,10 +49,10 @@ h, k, j, l
   Scroll to the left, down, up or right direction
 Left, Down, Up, Right
   Scroll to the left, down, up or right direction
-^d, ^u
-  Scroll a half page down or up
-^f, ^b, space, <S-space>
-  Scroll a full page down or up
+^t, ^d, ^u, ^y
+  Scroll a half page left, down, up or right
+t, ^f, ^b, space, <S-space>, y
+  Scroll a full page left, down, up or right
 gg, G, nG
   Goto to the first, the last or to the nth page
 ^c, Escape

zathura.h

@@ -16,7 +16,8 @@ enum { NEXT, PREVIOUS, LEFT, RIGHT, UP, DOWN, BOTTOM, TOP, HIDE, HIGHLIGHT,
   BACKWARD, ADJUST_BESTFIT, ADJUST_WIDTH, ADJUST_NONE, CONTINUOUS, DELETE_LAST,
   ADD_MARKER, EVAL_MARKER, EXPAND, EXPAND_ALL, COLLAPSE_ALL, 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 };
+  FULL_DOWN, HALF_LEFT, HALF_RIGHT, FULL_LEFT, FULL_RIGHT, NEXT_CHAR, PREVIOUS_CHAR, 
+  DELETE_TO_LINE_START, APPEND_FILEPATH };
 
 /* forward declaration for types from document.h */
 struct zathura_document_s;