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annotate scripts/prefs/getpref.m @ 20038:9fc020886ae9

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maint: Clean up m-files to follow Octave coding conventions. Try to trim long lines to < 80 chars. Use '##' for single line comments. Use '(...)' around tests for if/elseif/switch/while. Abut cell indexing operator '{' next to variable. Abut array indexing operator '(' next to variable. Use space between negation operator '!' and following expression. Use two newlines between endfunction and start of %!test or %!demo code. Remove unnecessary parens grouping between short-circuit operators. Remove stray extra spaces (typos) between variables and assignment operators. Remove stray extra spaces from ends of lines.
author Rik <rik@octave.org>
date Mon, 23 Feb 2015 14:54:39 -0800
parents 4197fc428c7d
children 03b9d17a2d95
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 2012-2015 John W. Eaton
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} getpref (@var{group}, @var{pref}, @var{default})
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21 ## Return the preference value corresponding to the named preference
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22 ## @var{pref} in the preference group @var{group}.
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23 ##
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24 ## The named preference group must be a character string.
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25 ##
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26 ## If @var{pref} does not exist in @var{group} and @var{default} is
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27 ## specified, return @var{default}.
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28 ##
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29 ## The preference @var{pref} may be a character string or a cell array
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30 ## of character strings. The corresponding default value @var{default}
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31 ## may be any value, or, if @var{pref} is a cell array of strings,
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32 ## @var{default} must be a cell array of values with the same size as
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33 ## @var{pref}.
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34 ##
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35 ## If neither @var{pref} nor @var{default} are specified, return a
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36 ## structure of preferences for the preference group @var{group}.
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37 ##
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38 ## If no arguments are specified, return a structure containing all
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39 ## groups of preferences and their values.
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40 ## @seealso{addpref, setpref, ispref, rmpref}
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41 ## @end deftypefn
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42
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43 ## Author: jwe
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44
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45 function retval = getpref (group, pref, default)
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46
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47 if (nargin == 0)
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48 retval = loadprefs ();
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49 elseif (nargin == 1)
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50 if (ischar (group))
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51 prefs = loadprefs ();
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52 if (isfield (prefs, group))
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53 retval = prefs.(group);
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54 else
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55 retval = [];
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56 endif
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57 else
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58 error ("expecting group to be a character string");
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59 endif
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60 elseif (nargin == 2 || nargin == 3)
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61 grp = getpref (group);
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62 if (ischar (pref))
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63 if (isfield (grp, pref))
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64 retval = grp.(pref);
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65 elseif (nargin == 3)
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66 retval = default;
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67 else
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68 error ("preference %s does not exist in group %s", pref, group);
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69 endif
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70 elseif (iscellstr (pref))
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71 if (nargin == 2 || size_equal (pref, default))
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72 for i = 1:numel (pref)
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73 if (isfield (grp, pref{i}))
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74 retval.(pref) = grp.(pref{i});
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75 elseif (nargin == 3)
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76 retval.(pref) = default{i};
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77 else
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78 error ("preference %s does not exist in group %s", pref{i}, group);
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79 endif
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80 endfor
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81 else
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82 error ("size mismatch for pref and default");
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83 endif
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84 else
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85 error ("expecting pref to be a character string or cellstr");
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86 endif
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87 else
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88 print_usage ();
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89 endif
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90
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91 endfunction
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92
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93
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94 ## Testing these functions will require some care to avoid wiping out
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95 ## existing (or creating unwanted) preferences for the user running the
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96 ## tests.
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97