exporting patch:
# HG changeset patch
# User Daniel Kraft <address@hidden>
# Date 1316721160 -7200
# Node ID c5a8b23db680e5085c34b509bd0dcaa1be674f20
# Parent  6d57e53b21ea7145b0754cdf0088f4ad558b4fed
New function 'profexplore' for interactive hierarchical profile exploration.

profexplore.m: New file.

diff -r 6d57e53b21ea -r c5a8b23db680 scripts/general/profexplore.m
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/general/profexplore.m	Thu Sep 22 21:52:40 2011 +0200
@@ -0,0 +1,131 @@
+## Copyright (C) 2011 Daniel Kraft
+##
+## This file is part of Octave.
+##
+## Octave 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.
+##
+## Octave 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn  {Function File} {} profexplore (@var{data})
+## Interactively explore hierarchical profiler output.
+##
+## Assuming @var{data} is the structure with profile data returned by
+## @code{profile ('info')}, this command opens an interactive prompt
+## that can be used to explore the call-tree.  Type @kbd{help} to get a list
+## of possible commands.
+## @end deftypefn
+
+## Built-in profiler.
+## Author: Daniel Kraft <address@hidden>
+
+function profexplore (data)
+
+  if (nargin ~= 1)
+    print_usage ();
+  endif
+
+  ## The actual work is done by a recursive worker function, since that
+  ## is an easy way to traverse the tree datastructure.  Here, we just check
+  ## the arguments (already done) and give over to it.
+
+  __profexplore_worker (data.FunctionTable, data.Hierarchical, "Top\n", "  ");
+
+endfunction
+
+## This is the worker function.  tree is the current subtree we want to
+## display / explore.  parents is a string containing the already 'rendered'
+## data for the parents which is displayed on top of the list of current
+## children.  prefix is the prefix to add to each line rendered; this
+## is just a string of spaces to get indentation right.
+##
+## Returning 0 indicates that the user requested to totally exit the
+## explorer, thus also all higher levels should exit immediately.  An integer
+## greater zero indicates to exit that many levels since the user wants to go
+## up (but not necessarily quit).
+
+function rv = __profexplore_worker (fcn_table, tree, parents, prefix)
+
+  ## Sort children by total time.
+  times = -[ tree.TotalTime ];
+  [~, p] = sort (times);
+  tree = tree(p);
+
+  while (true)
+
+    printf ("\n%s", parents);
+    strings = cell (length (tree), 1);
+    for i = 1 : length (tree)
+      strings{i} = sprintf ("%s: %d calls, %.3f total, %.3f self", ...
+                            fcn_table(tree(i).Index).FunctionName, ...
+                            tree(i).NumCalls, ...
+                            tree(i).TotalTime, tree(i).SelfTime);
+      printf ("%s%d) %s\n", prefix, i, strings{i});
+    endfor
+    printf ("\n");
+
+    cmd = input ("profexplore> ", "s");
+    option = fix (str2double (cmd));
+
+    if (strcmp (cmd, "exit"))
+      rv = 0;
+      return;
+    elseif (strcmp (cmd, "help"))
+      printf ("\nCommands for profile explorer:\n\n");
+      printf ("exit   Return to Octave prompt.\n");
+      printf ("help   Display this help message.\n");
+      printf ("up [N] Go up N levels, where N is an integer.  Default is 1.\n");
+      printf ("N      Go down a level into option N.\n");
+    elseif (~isnan (option))
+      if (option < 1 || option > length (tree))
+        printf ("The chosen option is out of range!\n");
+      else
+        newParents = sprintf ("%s%s%s\n", parents, prefix, strings{option});
+        newPrefix = sprintf ("%s  ", prefix);
+
+        rv = __profexplore_worker (fcn_table, tree(option).Children, ...
+                                   newParents, newPrefix);
+
+        if (rv == 0)
+          return;
+        elseif (rv > 1)
+          rv = rv - 1;
+          return;
+        else
+          assert (rv == 1);
+          ## It was requested to return to this level, so just stay.
+        endif
+      endif
+    elseif (length (cmd) >= 2 && strcmp (substr (cmd, 1, 2), "up"))
+      if (length (cmd) == 2)
+        rv = 1;
+        return;
+      endif
+
+      if (length (cmd) > 3 && cmd(3) == ' ')
+        opt = fix (str2double (substr (cmd, 3)));
+        if (~isnan (opt) && opt > 0)
+          rv = opt;
+          return;
+        endif
+      endif
+
+      printf ("Invalid 'up' command.  Type 'help' for further");
+      printf (" information.\n");
+    else
+      printf ("Unrecognized input.  Type 'help' to get a list of possible");
+      printf (" commands.\n");
+    endif
+
+  endwhile
+endfunction