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+++ b/scripts/help/type.m
@@ -0,0 +1,101 @@
+## Copyright (C) 2009 S�ren Hauberg
+##
+## This program 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 3 of the License, or (at
+## your option) any later version.
+##
+## This program 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 this program; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Command} type options name @dots{}
+## Display the definition of each @var{name} that refers to a function.
+## 
+## Normally also displays whether each @var{name} is user-defined or built-in;
+## the @code{-q} option suppresses this behaviour.
+##
+## If an output argument is requested nothing is displayed. Instead a cell array
+## of strings is returned, where each element corresponds to the definition of
+## each requested function.
+## @end deftypefn
+
+## PKG_ADD: mark_as_command type
+
+function retval = type (varargin)
+  ## Parse input
+  if (nargin == 0)
+    error ("type: not enough input arguments");
+  endif
+
+  if (!iscellstr (varargin))
+    error ("type: input arguments must be strings");
+  endif
+    
+  quiet = false;
+  idx = strcmpi (varargin, "-q") | strcmpi (varargin, "-quiet");
+  if (any (idx))
+    quiet = true;
+    varargin (idx) = [];
+  endif
+
+  text = cell (size (varargin));
+  for n = 1:length (varargin)
+    text {n} = do_type (varargin {n}, quiet);
+    if (nargout == 0)
+      disp (text {n});
+    endif
+  endfor
+  
+  ## Should we return the text or print if
+  if (nargout > 0)
+    retval = text;
+  endif
+endfunction
+
+function text = do_type (name, quiet)
+  ## Find function and get its code
+  text = "";
+  e = exist (name);
+  if (e == 2)
+    ## m-file or ordinary file
+    file = which (name);
+    if (isempty (file))
+      ## 'name' is an ordinary file, and not a function name.
+      ## FIXME: Should we just print it anyway?
+      error ("type: `%s' undefined\n", name);
+    endif
+    
+    ## Read the file
+    fid = fopen (file, "r");
+    if (fid < 0)
+      error ("type: couldn't open `%s' for reading", file);
+    endif
+    contents = char (fread (fid).');
+    fclose (fid);
+    
+    if (quiet)
+      text = contents;
+    else
+      text = sprintf ("%s is the user-defined function defined from: %s\n\n%s",
+                      name, file, contents);
+    endif    
+  elseif (e == 3)
+    text = sprintf ("%s is a dynamically-linked function", name);
+  elseif (e == 5)
+    text = sprintf ("%s is a built-in function", name);
+  elseif (any (strcmp (__operators__ (), name)))
+    text = sprintf ("%s is an operator", name);
+  elseif (any (strcmp (__keywords__ (), name)))
+    text = sprintf ("%s is a keyword", name);
+  else
+    error ("type: `%s' undefined\n", name);
+  endif
+endfunction
+