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/*
Copyright (C) 2013 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <vector>
#include <iostream>
#include <climits>
#include <cerrno>
#include <cstdlib>
#include <boost/regex.h>
#include <glibmm/miscutils.h>
#include "pbd/pathexpand.h"
#include "pbd/strsplit.h"
using std::string;
using std::vector;
string
PBD::canonical_path (const std::string& path)
{
#ifdef COMPILER_MINGW
return path;
#else
char buf[PATH_MAX+1];
if (!realpath (path.c_str(), buf) && (errno != ENOENT)) {
return path;
}
return string (buf);
#endif
}
string
PBD::path_expand (string path)
{
if (path.empty()) {
return path;
}
/* tilde expansion */
if (path[0] == '~') {
if (path.length() == 1) {
return Glib::get_home_dir();
}
if (path[1] == '/') {
path.replace (0, 1, Glib::get_home_dir());
} else {
/* can't handle ~roger, so just leave it */
}
}
/* now do $VAR substitution, since wordexp isn't reliable */
regex_t compiled_pattern;
const int nmatches = 100;
regmatch_t matches[nmatches];
if (regcomp (&compiled_pattern, "\\$([a-zA-Z_][a-zA-Z0-9_]*|\\{[a-zA-Z_][a-zA-Z0-9_]*\\})", REG_EXTENDED)) {
std::cerr << "bad regcomp\n";
return path;
}
while (true) {
if (regexec (&compiled_pattern, path.c_str(), nmatches, matches, 0)) {
break;
}
/* matches[0] gives the entire match */
string match = path.substr (matches[0].rm_so, matches[0].rm_eo - matches[0].rm_so);
/* try to get match from the environment */
if (match[1] == '{') {
/* ${FOO} form */
match = match.substr (2, match.length() - 3);
}
char* matched_value = getenv (match.c_str());
if (matched_value) {
path.replace (matches[0].rm_so, matches[0].rm_eo - matches[0].rm_so, matched_value);
} else {
path.replace (matches[0].rm_so, matches[0].rm_eo - matches[0].rm_so, string());
}
/* go back and do it again with whatever remains after the
* substitution
*/
}
regfree (&compiled_pattern);
/* canonicalize */
return canonical_path (path);
}
string
PBD::search_path_expand (string path)
{
if (path.empty()) {
return path;
}
vector<string> s;
vector<string> n;
split (path, s, ':');
for (vector<string>::iterator i = s.begin(); i != s.end(); ++i) {
string exp = path_expand (*i);
if (!exp.empty()) {
n.push_back (exp);
}
}
string r;
for (vector<string>::iterator i = n.begin(); i != n.end(); ++i) {
if (!r.empty()) {
r += ':';
}
r += *i;
}
return r;
}
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