Globbing in D

glob.d

string[] glob(string pattern)
{
    import std.string;
    string[] results;
    glob_t glob_result;
    glob(pattern.toStringz, 0, null, &glob_result);
    for (uint i = 0; i < glob_result.gl_pathc; i++)
    {
        results ~= glob_result.gl_pathv[i].fromStringz().idup;
    }

    globfree(&glob_result);
    return results;
}

import core.stdc.config;

extern (C){

enum _GLOB_H = 1;

/* We need `size_t' for the following definitions.  */
alias c_ulong __size_t;
alias c_ulong size_t;

/* The GNU CC stddef.h version defines __size_t as empty.  We need a real
   definition.  */

/* Bits set in the FLAGS argument to `glob'.  */
enum GLOB_ERR = 1 << 0; /* Return on read errors.  */
enum GLOB_MARK = 1 << 1; /* Append a slash to each name.  */
enum GLOB_NOSORT = 1 << 2; /* Don't sort the names.  */
enum GLOB_DOOFFS = 1 << 3; /* Insert PGLOB->gl_offs NULLs.  */
enum GLOB_NOCHECK = 1 << 4; /* If nothing matches, return the pattern.  */
enum GLOB_APPEND = 1 << 5; /* Append to results of a previous call.  */
enum GLOB_NOESCAPE = 1 << 6; /* Backslashes don't quote metacharacters.  */
enum GLOB_PERIOD = 1 << 7; /* Leading `.' can be matched by metachars.  */
enum GLOB_MAGCHAR = 1 << 8; /* Set in gl_flags if any metachars seen.  */
enum GLOB_ALTDIRFUNC = 1 << 9; /* Use gl_opendir et al functions.  */
enum GLOB_BRACE = 1 << 10; /* Expand "{a,b}" to "a" "b".  */
enum GLOB_NOMAGIC = 1 << 11; /* If no magic chars, return the pattern.  */
enum GLOB_TILDE = 1 << 12; /* Expand ~user and ~ to home directories. */
enum GLOB_ONLYDIR = 1 << 13; /* Match only directories.  */
enum GLOB_TILDE_CHECK = 1 << 14; /* Like GLOB_TILDE but return an error
				      if the user name is not available.  */
enum __GLOB_FLAGS = GLOB_ERR | GLOB_MARK | GLOB_NOSORT | GLOB_DOOFFS | GLOB_NOESCAPE | GLOB_NOCHECK | GLOB_APPEND | GLOB_PERIOD | GLOB_ALTDIRFUNC | GLOB_BRACE | GLOB_NOMAGIC | GLOB_TILDE | GLOB_ONLYDIR | GLOB_TILDE_CHECK;

/* Error returns from `glob'.  */
enum GLOB_NOSPACE = 1; /* Ran out of memory.  */
enum GLOB_ABORTED = 2; /* Read error.  */
enum GLOB_NOMATCH = 3; /* No matches found.  */
enum GLOB_NOSYS = 4; /* Not implemented.  */

/* Previous versions of this file defined GLOB_ABEND instead of
   GLOB_ABORTED.  Provide a compatibility definition here.  */

/* Structure describing a globbing run.  */

struct glob_t
{
    __size_t gl_pathc; /* Count of paths matched by the pattern.  */
    char** gl_pathv; /* List of matched pathnames.  */
    __size_t gl_offs; /* Slots to reserve in `gl_pathv'.  */
    int gl_flags; /* Set to FLAGS, maybe | GLOB_MAGCHAR.  */

    /* If the GLOB_ALTDIRFUNC flag is set, the following functions
       are used instead of the normal file access functions.  */
    void function (void*) gl_closedir;

    void* function (void*) gl_readdir;

    void* function (const(char)*) gl_opendir;

    int function (const(char)*, void*) gl_lstat;
    int function (const(char)*, void*) gl_stat;
}

/* If the GLOB_ALTDIRFUNC flag is set, the following functions
   are used instead of the normal file access functions.  */

/* Do glob searching for PATTERN, placing results in PGLOB.
   The bits defined above may be set in FLAGS.
   If a directory cannot be opened or read and ERRFUNC is not nil,
   it is called with the pathname that caused the error, and the
   `errno' value from the failing call; if it returns non-zero
   `glob' returns GLOB_ABEND; if it returns zero, the error is ignored.
   If memory cannot be allocated for PGLOB, GLOB_NOSPACE is returned.
   Otherwise, `glob' returns zero.  */

int glob (
    const(char)* __pattern,
    int __flags,
    int function (const(char)*, int) __errfunc,
    glob_t* __pglob);

/* Free storage allocated in PGLOB by a previous `glob' call.  */
void globfree (glob_t* __pglob);

/* Return nonzero if PATTERN contains any metacharacters.
   Metacharacters can be quoted with backslashes if QUOTE is nonzero.

   This function is not part of the interface specified by POSIX.2
   but several programs want to use it.  */
}

main.d

void main()
{
    import std.stdio;
    import glob : glob;
    foreach(entry; glob("/usr/*/python*"))
        writeln(entry);
}

output

> rdmd main.d

/usr/bin/python
/usr/bin/python-config
/usr/bin/python2
/usr/bin/python2-config
/usr/bin/python2.7
/usr/bin/python2.7-config
/usr/bin/python3
/usr/bin/python3-config
/usr/bin/python3.5
/usr/bin/python3.5-config
/usr/bin/python3.5m
/usr/bin/python3.5m-config
/usr/include/python2.7
/usr/include/python3.5m
/usr/lib/python2.7
/usr/lib/python3.4
/usr/lib/python3.5
/usr/lib64/python2.7
/usr/lib64/python3.4
/usr/lib64/python3.5
/usr/sbin/python
/usr/sbin/python-config
/usr/sbin/python2
/usr/sbin/python2-config
/usr/sbin/python2.7
/usr/sbin/python2.7-config
/usr/sbin/python3
/usr/sbin/python3-config
/usr/sbin/python3.5
/usr/sbin/python3.5-config
/usr/sbin/python3.5m
/usr/sbin/python3.5m-config