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#pike __REAL_VERSION__ 
 
//! Implements an abstraction of the normal filesystem. 
 
inherit Filesystem.Base; 
 
// Some notes about NT code: 
//   Paths are assumed to follow one of two different patterns: 
//    1. /foo/bar/gazonk     indicates a path on the current drive 
//    2. D:/foo/bar/gazonk   a path on the drive indicated by D. 
// 
//    It's possible to change the root from /foo/bar to d:/foo/bar/something, 
//    but it's not possible to change from c:/foo/bar to d:/foo/bar 
// 
//  Generally speaing, paths will almost always follow the second 
//  pattern, since getcwd() is used to get the initial value of the 
//  'wd' variable unless a different path is specified. 
// 
protected Filesystem.Base parent; // parent filesystem 
 
protected string root = ""; // Note: Can now include leading "/" 
protected string wd;        // never trailing "/" 
 
//! @decl void create(void|string directory, void|string root, void|int fast, void|Filesystem.Base parent) 
//! Instanciate a new object representing the filesystem. 
//! @param directory 
//! The directory (in the real filesystem) that should become 
//! the root of the filesystemobject. 
//! @param root 
//! Internal 
//! @param fast 
//! Internal 
//! @param parent 
//! Internal 
protected void create(void|string directory,  // default: cwd 
                   void|string _root,   // internal: root 
                   void|int fast,       // internal: fast mode (no check) 
                   void|Filesystem.Base _parent) 
                                 // internal: parent filesystem 
{ 
  if( _root ) 
  { 
#ifdef __NT__ 
    _root = replace( _root, "\\", "/" ); 
#endif 
    sscanf(reverse(_root), "%*[/]%s", root); 
    root = reverse( root ); // do not remove leading '/':es. 
  } 
 
  if(!fast) 
  { 
    Stdio.Stat a; 
    if(!directory || directory=="" || directory[0]!='/') 
      directory = combine_path(getcwd(), directory||""); 
#ifdef __NT__ 
    directory = replace( directory, "\\", "/" ); 
    string p; 
    if( sizeof(root) ) 
    { 
      if( sscanf( directory, "%s:/%s", p, directory ) ) 
      { 
        if( sizeof( root ) ) 
        { 
          if( !has_value( root, ":/" ) ) 
            root = p+":"+ (root[0] == '/' ?"":"/") + root; 
          else 
            error( "Cannot change directory to above"+root+"\n" ); 
        } 
        else 
          root = p+":/"; 
      } 
    } 
#endif 
    while( sizeof(directory) && directory[0] == '/' ) 
      directory = directory[1..]; 
    while( sizeof(directory) && directory[-1] == '/' ) 
      directory = directory[..<1]; 
#ifdef __NT__ 
    if( sizeof( directory ) != 2 || directory[1] != ':' ) 
#endif 
      if(!(a = file_stat(combine_path("/",root,directory))) || !a->isdir) 
        error("Not a directory\n"); 
  } 
  while( sizeof(directory) && directory[0] == '/' ) 
    directory = directory[1..]; 
  while( sizeof(directory) && directory[-1] == '/' ) 
    directory = directory[..<1]; 
  wd = directory; 
} 
 
protected string _sprintf(int t) 
{ 
  return t=='O' && sprintf("%O(/* root=%O, wd=%O */)", this_program, root, wd); 
} 
 
Filesystem.Base cd(string directory) 
{ 
  Filesystem.Stat st = stat(directory); 
#ifdef __NT__ 
  directory = replace( directory, "\\", "/" ); 
#endif 
  if(!st) return 0; 
  if(st->isdir) // stay 
    return this_program(combine_path(wd, directory), 
                        root, 1, parent); 
  return st->cd(); // try something else 
} 
 
Filesystem.Base cdup() 
{ 
  return cd(".."); 
} 
 
string cwd() 
{ 
  return wd; 
} 
 
Filesystem.Base chroot(void|string directory) 
{ 
  if(directory) 
  { 
    Filesystem.Base new = cd(directory); 
    if(!new) return 0; 
    return new->chroot(); 
  } 
  return this_program("", combine_path("/",root,wd), 1, parent); 
} 
 
Filesystem.Stat stat(string file, int|void lstat) 
{ 
   Stdio.Stat a; 
#ifdef __NT__ 
   file = replace( file, "\\", "/" ); 
   while( sizeof(file) && file[-1] == '/' ) 
     file = file[..<1]; 
#endif 
   string full = combine_path(wd, file); 
   if ( full!="" && full[0]=='/') full=full[1..]; 
 
   if((a = file_stat(combine_path("/",root,full), lstat))) 
   { 
     Filesystem.Stat s = Filesystem.Stat(); 
     s->fullpath = sprintf("/%s", full); 
     s->name = file; 
     s->filesystem = this; 
     s->attach_statobject(a); 
     return s; 
   } 
   else 
     return 0; 
} 
 
array(string) get_dir(void|string directory, void|string|array(string) globs) 
{ 
#ifdef __NT__ 
  if(directory) 
  { 
    directory = replace( directory, "\\", "/" ); 
    while( sizeof(directory) && directory[-1] == '/' ) 
      directory = directory[..<1]; 
  } 
#endif 
  directory = directory ? combine_path(wd, directory) : wd; 
 
  array(string) y = predef::get_dir(combine_path("/",root,directory)); 
  if(!globs) 
    return y; 
  else if(stringp(globs)) 
    return glob(globs, y); 
  else 
  { 
    array(string) p = ({}); 
    foreach(globs, string g) 
    { 
      array(string) z; 
      p += (z = glob(g, y)); 
      y -= z; 
    } 
    return p; 
  } 
} 
 
array(Filesystem.Stat) get_stats(void|string directory, 
                                 void|string|array(string) globs) 
{ 
  Filesystem.Base z = this; 
#ifdef __NT__ 
  if(directory) 
  { 
    directory = replace( directory, "\\", "/" ); 
    while( sizeof(directory) && directory[-1] == '/' ) 
      directory = directory[..<1]; 
  } 
#endif 
  if(directory && 
     !(z = z->cd(directory))) 
    return 0; 
 
  array(string) a = z->get_dir("", globs); 
  if(!a) return 0; 
 
  return map(a, z->stat, 1)-({0}); 
} 
 
Stdio.File open(string filename, string mode) 
{ 
#ifdef __NT__ 
  filename = replace( filename, "\\", "/" ); 
#endif 
  filename = combine_path(wd, filename); 
  if ( filename!="" && filename[0]=='/') filename=filename[1..]; 
 
  Stdio.File f = Stdio.File(); 
 
  if( !f->open( combine_path("/",root,filename), mode) ) 
    return 0; 
  return f; 
} 
 
// int access(string filename, string mode) 
// { 
//   return 1; // sure 
// } 
 
int rm(string filename) 
{ 
#ifdef __NT__ 
  filename = replace( filename, "\\", "/" ); 
#endif 
  filename = combine_path(wd, filename); 
  return predef::rm(combine_path("/",root,filename)); 
} 
 
void chmod(string filename, int|string mode) 
{ 
#ifdef __NT__ 
  filename = replace( filename, "\\", "/" ); 
#endif 
  filename = combine_path(wd, filename); 
  if(stringp(mode)) 
  { 
    Filesystem.Stat st = stat(filename); // call to self 
    if(!st) return 0; 
    mode = Filesystem.parse_mode(st->mode, mode); 
  } 
  predef::chmod(combine_path("/",root,filename), mode); 
} 
 
void chown(string filename, int|object owner, int|object group) 
{ 
#if constant(chown) 
#ifdef __NT__ 
  filename = replace( filename, "\\", "/" ); 
#endif 
  if(objectp(group)) 
    error("user objects not supported (yet)\n"); 
  if(objectp(owner)) 
    error("user objects not supported (yet)\n"); 
 
  filename = combine_path(wd, filename); 
  predef::chown(combine_path("/",root,wd), owner, group); 
#else 
  error("system does not have a chown"); // system does not have a chown() 
#endif 
} 
 
array find(void|function(Filesystem.Stat, mixed|void...:int) mask, 
           mixed|void ... extra) 
{ 
  array(Filesystem.Stat) res = ({}); 
  array(Filesystem.Stat) d = get_stats() || ({}); 
  array(Filesystem.Stat) r = filter(d, "isdir"); 
 
  if(mask) 
    res += filter(d-r, mask, @extra); 
  else 
    res += d-r; 
 
  foreach(r, Filesystem.Stat dir) 
  { 
    if(!mask || mask(dir, @extra)) 
      res += ({ dir }); 
 
    if(dir->name=="." || dir->name=="..") 
      continue; 
    res += dir->cd()->find(mask, @extra); 
  } 
 
  return res; 
}