Give subprocess creation a way to find a valid current directory

[bpt/emacs.git] / src / xmenu.c

/* X Communication module for terminals which understand the X protocol.
   Copyright (C) 1986, 1988, 1992 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* X pop-up deck-of-cards menu facility for gnuemacs.
 *
 * Written by Jon Arnold and Roman Budzianowski
 * Mods and rewrite by Robert Krawitz
 *
 */

#ifdef XDEBUG
#include <stdio.h>
#endif

/* On 4.3 this loses if it comes after xterm.h.  */
#include <signal.h>
#include "config.h"
#include "lisp.h"
#include "frame.h"
#include "window.h"
#include "keyboard.h"

/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "xterm.h"

/* Load sys/types.h if not already loaded.
   In some systems loading it twice is suicidal.  */
#ifndef makedev
#include <sys/types.h>
#endif

#include "dispextern.h"

#ifdef HAVE_X11
#include "../oldXMenu/XMenu.h"
#else
#include <X/XMenu.h>
#endif

#define min(x,y) (((x) < (y)) ? (x) : (y))
#define max(x,y) (((x) > (y)) ? (x) : (y))

#define NUL 0

#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif TRUE

#ifdef HAVE_X11
extern Display *x_current_display;
#else
#define	ButtonReleaseMask ButtonReleased
#endif /* not HAVE_X11 */

Lisp_Object xmenu_show ();
extern int x_error_handler ();

/*************************************************************/

#if 0
/* Ignoring the args is easiest.  */
xmenu_quit ()
{
  error ("Unknown XMenu error");
}
#endif

DEFUN ("x-popup-menu",Fx_popup_menu, Sx_popup_menu, 1, 2, 0,
  "Pop up a deck-of-cards menu and return user's selection.\n\
POSITION is a position specification.  This is either a mouse button event\n\
or a list ((XOFFSET YOFFSET) WINDOW)\n\
where XOFFSET and YOFFSET are positions in characters from the top left\n\
corner of WINDOW's frame.  A mouse-event list will serve for this.\n\
This controls the position of the center of the first line\n\
in the first pane of the menu, not the top left of the menu as a whole.\n\
\n\
MENU is a specifier for a menu.  For the simplest case, MENU is a keymap.\n\
The menu items come from key bindings that have a menu string as well as\n\
a definition; actually, the \"definition\" in such a key binding looks like\n\
\(STRING . REAL-DEFINITION).  To give the menu a title, put a string into\n\
the keymap as a top-level element.\n\n\
You can also use a list of keymaps as MENU.\n\
  Then each keymap makes a separate pane.\n\n\
Alternatively, you can specify a menu of multiple panes\n\
  with a list of the form\n\
\(TITLE PANE1 PANE2...), where each pane is a list of form\n\
\(TITLE (LINE ITEM)...).  Each line should be a string, and item should\n\
be the return value for that line (i.e. if it is selected.")
  (position, menu)
     Lisp_Object position, menu;
{
  int number_of_panes;
  Lisp_Object XMenu_return, keymap, tem;
  int XMenu_xpos, XMenu_ypos;
  char **menus;
  char ***names;
  Lisp_Object **obj_list;
  int *items;
  char *title;
  char *error_name;
  Lisp_Object ltitle, selection;
  int i, j;
  FRAME_PTR f;
  Lisp_Object x, y, window;

  /* Decode the first argument: find the window and the coordinates.  */
  tem = Fcar (position);
  if (XTYPE (tem) == Lisp_Cons)
    {
      window = Fcar (Fcdr (position));
      x = Fcar (tem);
      y = Fcar (Fcdr (tem));
    }
  else
    {
      tem = EVENT_START (position);
      window = POSN_WINDOW (tem);
      tem = POSN_WINDOW_POSN (tem);
      x = Fcar (tem);
      y = Fcdr (tem);
    }
  CHECK_LIVE_WINDOW (window, 0);
  CHECK_NUMBER (x, 0);
  CHECK_NUMBER (y, 0);

  f = XFRAME (WINDOW_FRAME (XWINDOW (window)));

  XMenu_xpos
    = FONT_WIDTH (f->display.x->font) * (XINT (x) + XWINDOW (window)->left);
  XMenu_ypos
    = FONT_HEIGHT (f->display.x->font) * (XINT (y) + XWINDOW (window)->top);
  XMenu_xpos += f->display.x->left_pos;
  XMenu_ypos += f->display.x->top_pos;

  keymap = Fkeymapp (menu);
  tem = Qnil;
  if (XTYPE (menu) == Lisp_Cons)
    tem = Fkeymapp (Fcar (menu));
  if (!NILP (keymap))
    {
      /* We were given a keymap.  Extract menu info from the keymap.  */
      Lisp_Object prompt;
      keymap = get_keymap (menu);

      /* Search for a string appearing directly as an element of the keymap.
	 That string is the title of the menu.  */
      prompt = map_prompt (keymap);
      if (!NILP (prompt))
	title = (char *) XSTRING (prompt)->data;

      /* Extract the detailed info to make one pane.  */
      number_of_panes = keymap_panes (&obj_list, &menus, &names, &items,
				      &menu, 1);
      /* The menu title seems to be ignored,
	 so put it in the pane title.  */
      if (menus[0] == 0)
	menus[0] = title;
    }
  else if (!NILP (tem))
    {
      /* We were given a list of keymaps.  */
      Lisp_Object prompt;
      int nmaps = XFASTINT (Flength (menu));
      Lisp_Object *maps
	= (Lisp_Object *) alloca (nmaps * sizeof (Lisp_Object));
      int i;
      title = 0;

      /* The first keymap that has a prompt string
	 supplies the menu title.  */
      for (tem = menu, i = 0; XTYPE (tem) == Lisp_Cons; tem = Fcdr (tem))
	{
	  maps[i++] = keymap = get_keymap (Fcar (tem));

	  prompt = map_prompt (keymap);
	  if (title == 0 && !NILP (prompt))
	    title = (char *) XSTRING (prompt)->data;
	}

      /* Extract the detailed info to make one pane.  */
      number_of_panes = keymap_panes (&obj_list, &menus, &names, &items,
				      maps, nmaps);
      /* The menu title seems to be ignored,
	 so put it in the pane title.  */
      if (menus[0] == 0)
	menus[0] = title;
    }
  else
    {
      /* We were given an old-fashioned menu.  */
      ltitle = Fcar (menu);
      CHECK_STRING (ltitle, 1);
      title = (char *) XSTRING (ltitle)->data;
      number_of_panes = list_of_panes (&obj_list, &menus, &names, &items,
				       Fcdr (menu));
    }
#ifdef XDEBUG
  fprintf (stderr, "Panes = %d\n", number_of_panes);
  for (i = 0; i < number_of_panes; i++)
    {
      fprintf (stderr, "Pane %d has lines %d title %s\n",
	       i, items[i], menus[i]);
      for (j = 0; j < items[i]; j++)
	fprintf (stderr, "    Item %d %s\n", j, names[i][j]);
    }
#endif
  BLOCK_INPUT;
  selection = xmenu_show (ROOT_WINDOW, XMenu_xpos, XMenu_ypos, names, menus,
			  items, number_of_panes, obj_list, title,
			  &error_name);
  UNBLOCK_INPUT;
  /* fprintf (stderr, "selection = %x\n", selection);  */
  if (selection != NUL)
    {				/* selected something */
      XMenu_return = selection;
    }
  else
    {				/* nothing selected */
      XMenu_return = Qnil;
    }
  /* now free up the strings */
  for (i = 0; i < number_of_panes; i++)
    {
      free (names[i]);
      free (obj_list[i]);
    }
  free (menus);
  free (obj_list);
  free (names);
  free (items);
  /* free (title); */
  if (error_name) error (error_name);
  return XMenu_return;
}

struct indices {
  int pane;
  int line;
};

Lisp_Object
xmenu_show (parent, startx, starty, line_list, pane_list, line_cnt,
		      pane_cnt, item_list, title, error)
     Window parent;		
     int startx, starty;	/* upper left corner position BROKEN */
     char **line_list[];   	/* list of strings for items */
     char *pane_list[];		/* list of pane titles */
     char *title;
     int pane_cnt;		/* total number of panes */
     Lisp_Object *item_list[];	/* All items */
     int line_cnt[];		/* Lines in each pane */
     char **error;		/* Error returned */
{
  XMenu *GXMenu;
  int last, panes, selidx, lpane, status;
  int lines, sofar;
  Lisp_Object entry;
  /* struct indices *datap, *datap_save; */
  char *datap;
  int ulx, uly, width, height;
  int dispwidth, dispheight;

  if (pane_cnt == 0)
    return 0;

  *error = (char *) 0;		/* Initialize error pointer to null */
  GXMenu = XMenuCreate (XDISPLAY parent, "emacs");
  if (GXMenu == NUL)
    {
      *error = "Can't create menu";
      return (0);
    }
  
  for (panes = 0, lines = 0; panes < pane_cnt;
       lines += line_cnt[panes], panes++)
    ;
  /* datap = (struct indices *) xmalloc (lines * sizeof (struct indices)); */
  /* datap = (char *) xmalloc (lines * sizeof (char));
    datap_save = datap;*/
  
  for (panes = 0, sofar = 0; panes < pane_cnt;
       sofar += line_cnt[panes], panes++)
    {
      /* create all the necessary panes */
      lpane = XMenuAddPane (XDISPLAY GXMenu, pane_list[panes], TRUE);
      if (lpane == XM_FAILURE)
	{
	  XMenuDestroy (XDISPLAY GXMenu);
	  *error = "Can't create pane";
	  return (0);
	}
      for (selidx = 0; selidx < line_cnt[panes]; selidx++)
	{
	  /* add the selection stuff to the menus */
	  /* datap[selidx+sofar].pane = panes;
	     datap[selidx+sofar].line = selidx; */
	  if (XMenuAddSelection (XDISPLAY GXMenu, lpane, 0,
				 line_list[panes][selidx], TRUE)
	      == XM_FAILURE)
	    {
	      XMenuDestroy (XDISPLAY GXMenu);
	      /* free (datap); */
	      *error = "Can't add selection to menu";
	      /* error ("Can't add selection to menu"); */
	      return (0);
	    }
	}
    }
  /* all set and ready to fly */
  XMenuRecompute (XDISPLAY GXMenu);
  dispwidth = DisplayWidth (x_current_display, XDefaultScreen (x_current_display));
  dispheight = DisplayHeight (x_current_display, XDefaultScreen (x_current_display));
  startx = min (startx, dispwidth);
  starty = min (starty, dispheight);
  startx = max (startx, 1);
  starty = max (starty, 1);
  XMenuLocate (XDISPLAY GXMenu, 0, 0, startx, starty,
	       &ulx, &uly, &width, &height);
  if (ulx+width > dispwidth)
    {
      startx -= (ulx + width) - dispwidth;
      ulx = dispwidth - width;
    }
  if (uly+height > dispheight)
    {
      starty -= (uly + height) - dispheight;
      uly = dispheight - height;
    }
  if (ulx < 0) startx -= ulx;
  if (uly < 0) starty -= uly;
    
  XMenuSetFreeze (GXMenu, TRUE);
  panes = selidx = 0;
  
  status = XMenuActivate (XDISPLAY GXMenu, &panes, &selidx,
			  startx, starty, ButtonReleaseMask, &datap);
  switch (status)
    {
    case XM_SUCCESS:
#ifdef XDEBUG
      fprintf (stderr, "pane= %d line = %d\n", panes, selidx);
#endif
      entry = item_list[panes][selidx];
      break;
    case XM_FAILURE:
      /* free (datap_save); */
      XMenuDestroy (XDISPLAY GXMenu);
      *error = "Can't activate menu";
      /* error ("Can't activate menu"); */
    case XM_IA_SELECT:
    case XM_NO_SELECT:
      entry = Qnil;
      break;
    }
  XMenuDestroy (XDISPLAY GXMenu);
  /* free (datap_save);*/
  return (entry);
}

syms_of_xmenu ()
{
  defsubr (&Sx_popup_menu);
}
\f
/* Construct the vectors that describe a menu
   and store them in *VECTOR, *PANES, *NAMES and *ITEMS.
   Each of those four values is a vector indexed by pane number.
   Return the number of panes.

   KEYMAPS is a vector of keymaps.  NMAPS gives the length of KEYMAPS.  */

int
keymap_panes (vector, panes, names, items, keymaps, nmaps)
     Lisp_Object ***vector;	/* RETURN all menu objects */
     char ***panes;		/* RETURN pane names */
     char ****names;		/* RETURN all line names */
     int **items;		/* RETURN number of items per pane */
     Lisp_Object *keymaps;
     int nmaps;
{
  /* Number of panes we have made.  */
  int p = 0;
  /* Number of panes we have space for.  */
  int npanes_allocated = nmaps;
  int mapno;

  if (npanes_allocated < 4)
    npanes_allocated = 4;

  /* Make space for an estimated number of panes.  */
  *vector = (Lisp_Object **) xmalloc (npanes_allocated * sizeof (Lisp_Object *));
  *panes = (char **) xmalloc (npanes_allocated * sizeof (char *));
  *items = (int *) xmalloc (npanes_allocated * sizeof (int));
  *names = (char ***) xmalloc (npanes_allocated * sizeof (char **));

  /* Loop over the given keymaps, making a pane for each map.
     But don't make a pane that is empty--ignore that map instead.
     P is the number of panes we have made so far.  */
  for (mapno = 0; mapno < nmaps; mapno++)
    single_keymap_panes (keymaps[mapno], panes, vector, names, items,
			 &p, &npanes_allocated, "");

  /* Return the number of panes.  */
  return p;
}

/* This is a recursive subroutine of the previous function.
   It handles one keymap, KEYMAP.
   The other arguments are passed along
   or point to local variables of the previous function.  */

single_keymap_panes (keymap, panes, vector, names, items,
		     p_ptr, npanes_allocated_ptr, pane_name)
     Lisp_Object keymap;
     Lisp_Object ***vector;	/* RETURN all menu objects */
     char ***panes;		/* RETURN pane names */
     char ****names;		/* RETURN all line names */
     int **items;		/* RETURN number of items per pane */
     int *p_ptr;
     int *npanes_allocated_ptr;
     char *pane_name;
{
  int i;
  Lisp_Object pending_maps;
  Lisp_Object tail, item, item1, item2, table;

  pending_maps = Qnil;

  /* Make sure we have room for another pane.  */
  if (*p_ptr == *npanes_allocated_ptr)
    {
      *npanes_allocated_ptr *= 2;

      *vector
	= (Lisp_Object **) xrealloc (*vector,
				     *npanes_allocated_ptr * sizeof (Lisp_Object *));
      *panes
	= (char **) xrealloc (*panes,
			      *npanes_allocated_ptr * sizeof (char *));
      *items
	= (int *) xrealloc (*items,
			    *npanes_allocated_ptr * sizeof (int));
      *names
	= (char ***) xrealloc (*names,
			       *npanes_allocated_ptr * sizeof (char **));
    }

  /* When a menu comes from keymaps, don't give names to the panes.  */
  (*panes)[*p_ptr] = pane_name;

  /* Get the length of the list level of the keymap.  */
  i = XFASTINT (Flength (keymap));

  /* Add in lengths of any arrays.  */
  for (tail = keymap; XTYPE (tail) == Lisp_Cons; tail = XCONS (tail)->cdr)
    if (XTYPE (XCONS (tail)->car) == Lisp_Vector)
      i += XVECTOR (XCONS (tail)->car)->size;

  /* Create vectors for the names and values of the items in the pane.
     I is an upper bound for the number of items.  */
  (*vector)[*p_ptr] = (Lisp_Object *) xmalloc (i * sizeof (Lisp_Object));
  (*names)[*p_ptr] = (char **) xmalloc (i * sizeof (char *));

  /* I is now the index of the next unused slots.  */
  i = 0;
  for (tail = keymap; XTYPE (tail) == Lisp_Cons; tail = XCONS (tail)->cdr)
    {
      /* Look at each key binding, and if it has a menu string,
	 make a menu item from it.  */
      item = XCONS (tail)->car;
      if (XTYPE (item) == Lisp_Cons)
	{
	  item1 = XCONS (item)->cdr;
	  if (XTYPE (item1) == Lisp_Cons)
	    {
	      item2 = XCONS (item1)->car;
	      if (XTYPE (item2) == Lisp_String)
		{
		  Lisp_Object tem;
		  tem = Fkeymapp (Fcdr (item1));
		  if (XSTRING (item2)->data[0] == '@' && !NILP (tem))
		    pending_maps = Fcons (Fcons (Fcdr (item1), item2),
					  pending_maps);
		  else
		    {
		      (*names)[*p_ptr][i] = (char *) XSTRING (item2)->data;
		      /* The menu item "value" is the key bound here.  */
		      (*vector)[*p_ptr][i] = XCONS (item)->car;
		      i++;
		    }
		}
	    }
	}
      else if (XTYPE (item) == Lisp_Vector)
	{
	  /* Loop over the char values represented in the vector.  */
	  int len = XVECTOR (item)->size;
	  int c;
	  for (c = 0; c < len; c++)
	    {
	      Lisp_Object character;
	      XFASTINT (character) = c;
	      item1 = XVECTOR (item)->contents[c];
	      if (XTYPE (item1) == Lisp_Cons)
		{
		  item2 = XCONS (item1)->car;
		  if (XTYPE (item2) == Lisp_String)
		    {
		      Lisp_Object tem;
		      tem = Fkeymapp (Fcdr (item1));
		      if (XSTRING (item2)->data[0] == '@' && !NILP (tem))
			pending_maps = Fcons (Fcons (Fcdr (item1), item2),
					      pending_maps);
		      else
			{
			  (*names)[*p_ptr][i] = (char *) XSTRING (item2)->data;
			  /* The menu item "value" is the key bound here.  */
			  (*vector)[*p_ptr][i] = character;
			  i++;
			}
		    }
		}
	    }
	}
    }
  /* Record the number of items in the pane.  */
  (*items)[*p_ptr] = i;

  /* If we just made an empty pane, get rid of it.  */
  if (i == 0)
    {
      free ((*vector)[*p_ptr]);
      free ((*names)[*p_ptr]);
    }
  /* Otherwise, advance past it.  */
  else
    (*p_ptr)++;

  /* Process now any submenus which want to be panes at this level.  */
  while (!NILP (pending_maps))
    {
      Lisp_Object elt;
      elt = Fcar (pending_maps);
      single_keymap_panes (Fcar (elt), panes, vector, names, items,
			   p_ptr, npanes_allocated_ptr,
			   /* Add 1 to discard the @.  */
			   (char *) XSTRING (XCONS (elt)->cdr)->data + 1);
      pending_maps = Fcdr (pending_maps);
    }
}
\f
/* Construct the vectors that describe a menu
   and store them in *VECTOR, *PANES, *NAMES and *ITEMS.
   Each of those four values is a vector indexed by pane number.
   Return the number of panes.

   MENU is the argument that was given to Fx_popup_menu.  */

int
list_of_panes (vector, panes, names, items, menu)
     Lisp_Object ***vector;	/* RETURN all menu objects */
     char ***panes;		/* RETURN pane names */
     char ****names;		/* RETURN all line names */
     int **items;		/* RETURN number of items per pane */
     Lisp_Object menu;
{
  Lisp_Object tail, item, item1;
  int i;
  
  if (XTYPE (menu) != Lisp_Cons) menu = wrong_type_argument (Qlistp, menu);

  i = XFASTINT (Flength (menu));

  *vector = (Lisp_Object **) xmalloc (i * sizeof (Lisp_Object *));
  *panes = (char **) xmalloc (i * sizeof (char *));
  *items = (int *) xmalloc (i * sizeof (int));
  *names = (char ***) xmalloc (i * sizeof (char **));

  for (i = 0, tail = menu; !NILP (tail); tail = Fcdr (tail), i++)
    {
      item = Fcdr (Fcar (tail));
      if (XTYPE (item) != Lisp_Cons) (void) wrong_type_argument (Qlistp, item);
#ifdef XDEBUG
      fprintf (stderr, "list_of_panes check tail, i=%d\n", i);
#endif
      item1 = Fcar (Fcar (tail));
      CHECK_STRING (item1, 1);
#ifdef XDEBUG
      fprintf (stderr, "list_of_panes check pane, i=%d%s\n", i,
	       XSTRING (item1)->data);
#endif
      (*panes)[i] = (char *) XSTRING (item1)->data;
      (*items)[i] = list_of_items ((*vector)+i, (*names)+i, item);
      /* (*panes)[i] = (char *) xmalloc ((XSTRING (item1)->size)+1);
	 bcopy (XSTRING (item1)->data, (*panes)[i], XSTRING (item1)->size + 1)
	 ; */
    }
  return i;
}
\f
/* Construct the lists of values and names for a single pane, from the
   alist PANE.  Put them in *VECTOR and *NAMES.
   Return the number of items.  */

int
list_of_items (vector, names, pane)  /* get list from emacs and put to vector */
     Lisp_Object **vector;	/* RETURN menu "objects" */
     char ***names;		/* RETURN line names */
     Lisp_Object pane;
{
  Lisp_Object tail, item, item1;
  int i;

  if (XTYPE (pane) != Lisp_Cons) pane = wrong_type_argument (Qlistp, pane);

  i = XFASTINT (Flength (pane, 1));

  *vector = (Lisp_Object *) xmalloc (i * sizeof (Lisp_Object));
  *names = (char **) xmalloc (i * sizeof (char *));

  for (i = 0, tail = pane; !NILP (tail); tail = Fcdr (tail), i++)
    {
      item = Fcar (tail);
      if (XTYPE (item) != Lisp_Cons) (void) wrong_type_argument (Qlistp, item);
#ifdef XDEBUG
      fprintf (stderr, "list_of_items check tail, i=%d\n", i);
#endif
      (*vector)[i] =  Fcdr (item);
      item1 = Fcar (item);
      CHECK_STRING (item1, 1);
#ifdef XDEBUG
      fprintf (stderr, "list_of_items check item, i=%d%s\n", i,
	       XSTRING (item1)->data);
#endif
      (*names)[i] = (char *) XSTRING (item1)->data;
    }
  return i;
}