2 * \file environment.cpp
3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
6 * \author Angus Leeming
7 * \author João Luis M. Assirati
8 * \author Lars Gullik Bjønnes
10 * Full author contact details are available in file CREDITS.
15 #include "support/environment.h"
17 #include "support/docstring.h"
18 #include "support/os.h"
20 #include <boost/tokenizer.hpp>
31 string const getEnv(string const & envname)
33 // f.ex. what about error checking?
34 char const * const ch = getenv(envname.c_str());
35 return ch ? to_utf8(from_local8bit(ch)) : string();
39 vector<string> const getEnvPath(string const & name)
41 typedef boost::char_separator<char> Separator;
42 typedef boost::tokenizer<Separator> Tokenizer;
44 string const env_var = getEnv(name);
45 Separator const separator(string(1, os::path_separator()).c_str());
46 Tokenizer const tokens(env_var, separator);
47 Tokenizer::const_iterator it = tokens.begin();
48 Tokenizer::const_iterator const end = tokens.end();
51 for (; it != end; ++it)
52 vars.push_back(os::internal_path(*it));
58 bool setEnv(string const & name, string const & value)
60 // CHECK Look at and fix this.
61 // f.ex. what about error checking?
63 string const encoded = to_local8bit(from_utf8(value));
64 #if defined (HAVE_SETENV)
65 return ::setenv(name.c_str(), encoded.c_str(), 1) == 0;
66 #elif defined (HAVE_PUTENV)
67 static map<string, string> varmap;
68 varmap[name] = name + '=' + encoded;
69 return ::putenv(const_cast<char*>(varmap[name].c_str())) == 0;
71 #error No environment-setting function has been defined.
77 void setEnvPath(string const & name, vector<string> const & env)
79 char const separator(os::path_separator());
81 vector<string>::const_iterator const begin = env.begin();
82 vector<string>::const_iterator const end = env.end();
83 vector<string>::const_iterator it = begin;
84 for (; it != end; ++it) {
87 ss << os::external_path(*it);
89 setEnv(name, ss.str());
93 void prependEnvPath(string const & name, string const & prefix)
95 vector<string> env_var = getEnvPath(name);
97 typedef boost::char_separator<char> Separator;
98 typedef boost::tokenizer<Separator> Tokenizer;
100 Separator const separator(string(1, os::path_separator()).c_str());
102 // Prepend each new element to the list, removing identical elements
103 // that occur later in the list.
104 Tokenizer const tokens(prefix, separator);
105 vector<string> reversed_tokens(tokens.begin(), tokens.end());
107 typedef vector<string>::const_reverse_iterator token_iterator;
108 token_iterator it = reversed_tokens.rbegin();
109 token_iterator const end = reversed_tokens.rend();
110 for (; it != end; ++it) {
111 vector<string>::iterator remove_it =
112 remove(env_var.begin(), env_var.end(), *it);
113 env_var.erase(remove_it, env_var.end());
114 env_var.insert(env_var.begin(), *it);
117 setEnvPath(name, env_var);
120 } // namespace support