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/*****
* locate.cc
* Tom Prince 2005/03/24
*
* Locate files in search path.
*****/
#include <unistd.h>
#include "settings.h"
#include "util.h"
#include "locate.h"
namespace settings {
namespace fs {
string extension(string name)
{
size_t n = name.rfind(".");
if (n != string::npos)
return name.substr(n);
else
return string();
}
bool exists(string filename)
{
return ::access(filename.c_str(), R_OK) == 0;
}
} // namespace fs
file_list_t searchPath;
// Returns list of possible filenames, accounting for extensions.
file_list_t mungeFileName(string id)
{
string ext = fs::extension(id);
file_list_t files;
if (ext == "."+settings::suffix) {
files.push_back(id);
files.push_back(id+"."+settings::suffix);
} else {
files.push_back(id+"."+settings::suffix);
files.push_back(id);
}
return files;
}
// Join a directory with the given filename, to give the path to the file. This
// also avoids unsightly joins such as './file.asy' in favour of 'file.asy' and
// 'dir//file.asy' in favour of 'dir/file.asy'
string join(string dir, string file)
{
return dir == "." ? file :
*dir.rbegin() == '/' ? dir + file :
dir + "/" + file;
}
// Find the appropriate file, first looking in the local directory, then the
// directory given in settings, and finally the global system directory.
string locateFile(string id)
{
if(id.empty()) return "";
file_list_t filenames = mungeFileName(id);
for (file_list_t::iterator leaf = filenames.begin();
leaf != filenames.end();
++leaf) {
#ifdef __MSDOS__
size_t p;
while ((p=leaf->find('\\')) < string::npos)
(*leaf)[p]='/';
if ((p=leaf->find(':')) < string::npos && p > 0) {
(*leaf)[p]='/';
leaf->insert(0,"/cygdrive/");
}
#endif
if ((*leaf)[0] == '/') {
string file = *leaf;
if (fs::exists(file))
return file;
} else {
for (file_list_t::iterator dir = searchPath.begin();
dir != searchPath.end();
++dir) {
string file = join(*dir,*leaf);
if (fs::exists(file))
return file;
}
}
}
return string();
}
} // namespace settings
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