/* Copyright (C) 2004 J.F.Dockes
* 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.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _FSTREEWALK_H_INCLUDED_
#define _FSTREEWALK_H_INCLUDED_
#include <string>
#include <list>
#ifndef NO_NAMESPACES
using std::string;
using std::list;
#endif
class FsTreeWalkerCB;
struct stat;
/**
* Class implementing a unix directory recursive walk.
*
* A user-defined function object is called for every file or
* directory. Patterns to be ignored can be set before starting the
* walk. Options control whether we follow symlinks and whether we recurse
* on subdirectories.
*/
class FsTreeWalker {
public:
// Flags for call to processone(). FtwDirEnter is used when
// entering a directory. FtwDirReturn is used when returning to it
// after processing a subdirectory.
enum CbFlag {FtwRegular, FtwDirEnter, FtwDirReturn};
enum Status {FtwOk=0, FtwError=1, FtwStop=2,
FtwStatAll = FtwError|FtwStop};
enum Options {FtwOptNone = 0, FtwNoRecurse = 1, FtwFollow = 2,
FtwNoCanon = 4,
// Tree walking options. Natural is close to depth first: process
// directory entries as we see them, recursing into subdirectories at
// once
// Breadth means we process all files and dirs at a given directory level
// before going deeper.
//
// FilesThenDirs is close to Natural, except that we process all files in a
// given directory before going deeper: allows keeping only a single
// directory open
// We don't do pure depth first (process subdirs before files), this does
// not appear to make any sense.
FtwTravNatural = 0x10000, FtwTravBreadth = 0x20000,
FtwTravFilesThenDirs = 0x40000,
FtwTravBreadthThenDepth = 0x80000
};
static const int FtwTravMask;
FsTreeWalker(int opts = FtwTravNatural);
~FsTreeWalker();
void setOpts(Options opts, int depthswitch = 4);
/**
* Begin file system walk.
* @param dir is not checked against the ignored patterns (this is
* a feature and must not change.
* @param cb the function object that will be called back for every
* file-system object (called both at entry and exit for directories).
*/
Status walk(const string &dir, FsTreeWalkerCB& cb);
/** Get explanation for error */
string getReason();
int getErrCnt();
/**
* Add a pattern to the list of things (file or dir) to be ignored
* (ie: #* , *~)
*/
bool addSkippedName(const string &pattern);
/** Set the ignored patterns list */
bool setSkippedNames(const list<string> &patlist);
/** Same for skipped paths: this are paths, not names, under which we
do not descend (ie: /home/me/.recoll) */
bool addSkippedPath(const string &path);
/** Set the ignored paths list */
bool setSkippedPaths(const list<string> &pathlist);
/** Test if path/name should be skipped. This can be used independantly of
* an actual tree walk */
bool inSkippedPaths(const string& path, bool ckparents = true);
bool inSkippedNames(const string& name);
private:
Status iwalk(const string &dir, struct stat *stp, FsTreeWalkerCB& cb);
class Internal;
Internal *data;
};
class FsTreeWalkerCB {
public:
virtual ~FsTreeWalkerCB() {}
virtual FsTreeWalker::Status
processone(const string &, const struct stat *, FsTreeWalker::CbFlag)
= 0;
};
#endif /* _FSTREEWALK_H_INCLUDED_ */