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