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>
33 string const getEnv(string const & envname)
35 // f.ex. what about error checking?
36 char const * const ch = getenv(envname.c_str());
37 return ch ? to_utf8(from_local8bit(ch)) : string();
41 vector<string> const getEnvPath(string const & name)
43 typedef boost::char_separator<char> Separator;
44 typedef boost::tokenizer<Separator> Tokenizer;
46 string const env_var = getEnv(name);
47 Separator const separator(string(1, os::path_separator()).c_str());
48 Tokenizer const tokens(env_var, separator);
49 Tokenizer::const_iterator it = tokens.begin();
50 Tokenizer::const_iterator const end = tokens.end();
52 std::vector<string> vars;
53 for (; it != end; ++it)
54 vars.push_back(os::internal_path(*it));
60 bool setEnv(string const & name, string const & value)
62 // CHECK Look at and fix this.
63 // f.ex. what about error checking?
65 string const encoded = to_local8bit(from_utf8(value));
66 #if defined (HAVE_SETENV)
67 return ::setenv(name.c_str(), encoded.c_str(), true);
68 #elif defined (HAVE_PUTENV)
69 static std::map<string, string> varmap;
70 varmap[name] = name + '=' + encoded;
71 return ::putenv(varmap[name].c_str()) == 0;
73 #error No environment-setting function has been defined.
79 void setEnvPath(string const & name, vector<string> const & env)
81 char const separator(os::path_separator());
82 std::ostringstream ss;
83 vector<string>::const_iterator const begin = env.begin();
84 vector<string>::const_iterator const end = env.end();
85 vector<string>::const_iterator it = begin;
86 for (; it != end; ++it) {
89 ss << os::external_path(*it);
91 setEnv(name, ss.str());
95 void prependEnvPath(string const & name, string const & prefix)
97 vector<string> env_var = getEnvPath(name);
99 typedef boost::char_separator<char> Separator;
100 typedef boost::tokenizer<Separator> Tokenizer;
102 Separator const separator(string(1, os::path_separator()).c_str());
104 // Prepend each new element to the list, removing identical elements
105 // that occur later in the list.
106 Tokenizer const tokens(prefix, separator);
107 vector<string> reversed_tokens(tokens.begin(), tokens.end());
109 typedef vector<string>::const_reverse_iterator token_iterator;
110 token_iterator it = reversed_tokens.rbegin();
111 token_iterator const end = reversed_tokens.rend();
112 for (; it != end; ++it) {
113 vector<string>::iterator remove_it =
114 std::remove(env_var.begin(), env_var.end(), *it);
115 env_var.erase(remove_it, env_var.end());
116 env_var.insert(env_var.begin(), *it);
119 setEnvPath(name, env_var);
122 } // namespace support