source: trunk/lib/Gnuplot.cc @ 84

Last change on this file since 84 was 84, checked in by Jari Häkkinen, 15 years ago

Added copyright statement. Bumped version number to pre0.3. Cleaned up code.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.7 KB
Line 
1// $Id: Gnuplot.cc 84 2006-03-13 22:04:34Z jari $
2
3/*
4  Copyright (C) 2006 Jari Häkkinen, Peter Johansson
5
6  This file is part of svnstat, http://lev.thep.lu.se/trac/svnstat
7
8  svnstat is free software; you can redistribute it and/or modify it
9  under the terms of the GNU General Public License as published by
10  the Free Software Foundation; either version 2 of the License, or
11  (at your option) any later version.
12
13  svnstat is distributed in the hope that it will be useful, but
14  WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  General Public License for more details.
17
18  You should have received a copy of the GNU General Public License
19  along with this program; if not, write to the Free Software
20  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
21  02111-1307, USA.
22*/
23
24#include "Gnuplot.h"
25
26#include <cstdio>
27#include <string>
28#include <unistd.h>
29
30#include <iostream>
31
32
33namespace theplu {
34namespace svnstat {
35
36
37  Gnuplot::Gnuplot(void)
38    : linestyle_("steps"), pipe_(NULL)
39  {
40    acquire_program_path("gnuplot");
41    if (gnuplot_binary_.empty())
42      throw GnuplotException("Can't find gnuplot in your PATH");
43
44    pipe_=popen(gnuplot_binary_.c_str(),"w");
45    if (!pipe_)
46      throw GnuplotException("Could'nt open connection to gnuplot");
47  }
48
49
50  Gnuplot::~Gnuplot(void)
51  {
52    if (pclose(pipe_) == -1)
53      throw GnuplotException("Problem closing communication to gnuplot");
54  }
55
56
57  void Gnuplot::acquire_program_path(const std::string& progname)
58  {
59    char* env_path=getenv("PATH");  // is there a need to free this memory?
60    if (!env_path)
61      throw GnuplotException("Environment variable PATH is not set");
62
63    std::list<std::string> paths;
64    tokenizer(env_path,paths);
65    for (std::list<std::string>::const_iterator i=paths.begin();
66         i!=paths.end(); ++i) {
67      std::string tmp((*i) + '/' + progname);
68      if (!access(tmp.c_str(),X_OK)) {
69        gnuplot_binary_=tmp;
70        break;
71      }
72    }
73
74    if (gnuplot_binary_.empty())
75      throw GnuplotException("Cannot find '" + progname + "' in PATH");
76  }
77
78 
79  void Gnuplot::command(const std::string& cmdstr)
80  {
81    fputs(cmdstr.c_str(),pipe_);
82    if (*(cmdstr.rbegin())!='\n')
83      fputc('\n',pipe_);
84    fflush(pipe_);
85  }
86
87
88  void Gnuplot::tokenizer(const std::string& in,
89                          std::list<std::string>& tokens,
90                          const std::string& delimiters)
91  {
92    std::string::size_type previous_pos=in.find_first_not_of(delimiters,0);
93    std::string::size_type position=in.find_first_of(delimiters,previous_pos);
94    while ((std::string::npos!=position) || (std::string::npos!=previous_pos)) {
95      tokens.push_back(in.substr(previous_pos, position-previous_pos));
96      previous_pos=in.find_first_not_of(delimiters,position);
97      position=in.find_first_of(delimiters,previous_pos);
98    }
99  }
100
101
102}} // end of namespace svnstat and namespace theplu
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