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annotate scripts/plot/__gnuplot_get_var__.m @ 9099:3a5d41b382ab

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__gnuplot_get_var__.m: Correct misleading error messages, and remove dangling/commented code.
author Ben Abbott <bpabbott@mac.com>
date Mon, 06 Apr 2009 19:33:01 -0400
parents b3268a0458f2
children d0d507cbd123
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rev   line source
9001
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
Ben Abbott <bpabbott@mac.com>
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1 ## Copyright (C) 2009 Ben Abbott
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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
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{value} =} __gnuplot_get_var__ (@var{h}, @var{name}, @var{fmt})
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21 ## Undocumented internal function.
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22 ## @end deftypefn
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23
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24 ## Author: Ben Abbott <bpabbott@mac.com>
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25 ## Created: 2009-02-07
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26
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27 function gp_var_value = __gnuplot_get_var__ (h, gp_var_name, fmt)
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28
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29 if (nargin == 0)
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30 h = gcf ();
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31 endif
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32 if (nargin < 2)
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33 print_usage ();
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34 endif
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35 if (nargin < 3)
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36 fmt = '';
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37 endif
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38
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39 if (numel (h) == 1 && isfigure (h))
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40 ostream = get (h, "__plot_stream__");
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41 else
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42 ostream = h;
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43 endif
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44 if (numel (ostream) < 1)
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45 error ("__gnuplot_get_var__: stream to gnuplot not open");
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46 elseif (ispc ())
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47 if (numel (ostream) == 1)
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48 error ("__gnuplot_get_var__: Need mkfifo that is not implemented under Windows");
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49 endif
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50 use_mkfifo = false;
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51 istream = ostream(2);
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52 ostream = ostream(1);
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53 else
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54 use_mkfifo = true;
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55 ostream = ostream(1);
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56 endif
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57
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58 if (use_mkfifo)
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59 gpin_name = tmpnam ();
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60
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61 ## Mode: 6*8*8 == 0600
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62 [err, msg] = mkfifo (gpin_name, 6*8*8);
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63
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64 if (err != 0)
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65 error ("__gnuplot_get_var__: Can not make fifo (%s)", msg);
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66 endif
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67 endif
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68
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69 gp_var_name = strtrim (gp_var_name);
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70 n = min (strfind (gp_var_name, " "), strfind (gp_var_name, ",")) - 1;
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71 if (isempty (n))
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72 n = numel (gp_var_name);
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73 endif
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74
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75 unwind_protect
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76
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77 ## Notes: Variables may be undefined if user closes gnuplot by "q"
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78 ## or Alt-F4. Further, this abrupt close also requires the leading
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79 ## "\n" on the next line.
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80 if (use_mkfifo)
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81 fprintf (ostream, "\nset print \"%s\";\n", gpin_name);
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82 fflush (ostream);
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83 [gpin, err] = fopen (gpin_name, "r");
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84 if (err != 0)
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85 error ("__gnuplot_get_var__: Can not open fifo.");
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86 endif
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87 gp_cmd = sprintf ("\nif (exists(\"%s\")) print %s; else print NaN\n",
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88 gp_var_name(1:n), gp_var_name);
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89 fputs (ostream, gp_cmd);
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90
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91 ## Close output file, to force it to be flushed
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92 fputs (ostream, "set print;\n");
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93 fflush (ostream);
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94
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95 ## Now read from fifo.
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96 reading = true;
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97 str = {};
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98 while (reading)
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99 str{end+1} = fgets (gpin);
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100 if (isnumeric (str{end}) && (str{end} == -1))
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101 reading = false;
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102 str = str(1:(end-1));
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103 endif
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104 endwhile
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105 str = strcat (str{:});
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106 fclose (gpin);
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107 else
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108 ## Direct gnuplot to print to <STDOUT>
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109 fprintf (ostream, "set print \"-\";\n");
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110 fflush (ostream);
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111 gp_cmd = sprintf ("\nif (exists(\"%s\")) print \"OCTAVE: \", %s; else print NaN\n",
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112 gp_var_name(1:n), gp_var_name);
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113 fputs (ostream, gp_cmd);
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114 fflush (ostream);
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115 ## Direct gnuplot to print to <STDERR>
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116 fputs (ostream, "set print;\n");
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117 fflush (ostream);
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118
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119 str = {};
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120 while (isempty (str))
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121 str = char (fread (istream)');
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122 if (! isempty (str))
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123 str = regexp (str, "OCTAVE:.*", "match")
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124 str = str{end}(8:end);
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125 endif
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126 fclear (istream);
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127 endwhile
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128 endif
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
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129
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130 ## Strip out EOLs and the continuation character "|"
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131 str(str=="\n") = "";
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132 str(str=="\r") = "";
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133 n_continue = strfind (str, " \\ ");
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134 if (! isempty (n_continue))
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135 str(n_continue+1) = "";
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136 endif
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137
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
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138 if (isempty (fmt))
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139 gp_var_value = strtrim (str);
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140 else
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141 gp_var_value = sscanf (str, fmt);
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142 endif
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143
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
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144 unwind_protect_cleanup
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
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145 if (use_mkfifo)
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
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146 unlink (gpin_name);
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147 endif
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
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148 end_unwind_protect
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149
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
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150 endfunction
b3268a0458f2 __gnuplot_get_var__.m: Add function to get gnuplot variables.
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parents:
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151