Make directory path: Difference between revisions
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This task is named after the posix <code>[http://www.unix.com/man-page/POSIX/0/mkdir/ mkdir -p]</code> command, and several libraries which implement the same behavior. |
This task is named after the posix <code>[http://www.unix.com/man-page/POSIX/0/mkdir/ mkdir -p]</code> command, and several libraries which implement the same behavior. |
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Please implement a function of a single path string (for example <code>./path/to/dir</code>) which has the above side-effect. |
Please implement a function of a single path string (for example <code>./path/to/dir</code>) which has the above side-effect. |
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If the directory already exists, return successfully. |
If the directory already exists, return successfully. |
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Revision as of 05:10, 9 August 2014
Create a directory and any missing parents.
This task is named after the posix mkdir -p
command, and several libraries which implement the same behavior.
Please implement a function of a single path string (for example ./path/to/dir
) which has the above side-effect.
If the directory already exists, return successfully.
Ideally implementations will work equally well cross-platform (on windows, linux, and OS X).
Python
<lang Python> from errno import EEXIST from os import mkdir, curdir from os.path import split, exists
def mkdirp(path, mode=0777):
head, tail = split(path) if not tail: head, tail = split(head) if head and tail and not exists(head): try: mkdirp(head, mode) except OSError as e: # be happy if someone already created the path if e.errno != EEXIST: raise if tail == curdir: # xxx/newdir/. exists if xxx/newdir exists return try: mkdir(path, mode) except OSError as e: # be happy if someone already created the path if e.errno != EEXIST: raise
</lang>
Above is a modified version of the standard library's os.makedirs
, for pedagogical purposes. In practice, you would be more likely to use the standard library call:
<lang Python> def mkdirp(path):
try: os.makedirs(path) except OSError as exc: # Python >2.5 if exc.errno == errno.EEXIST and os.path.isdir(path): pass else: raise
</lang>
In Python3 this becomes even simpler:
<lang Python> def mkdirp(path):
os.makedirs(path, exist_ok=True)
</lang>
JavaScript
Largely stolen from the popular mkdirp library.
<lang Javascript>var path = require('path'); var fs = require('fs');
function mkdirp (p, f, made) {
if (!made) made = null;
var cb = f || function () {}; p = path.resolve(p);
fs.mkdir(p, function (er) { if (!er) { made = made || p; return cb(null, made); } switch (er.code) { case 'ENOENT': mkdirp(path.dirname(p), function (er, made) { if (er) cb(er, made); else mkdirp(p, cb, made); }); break;
// In the case of any other error, just see if there's a dir // there already. If so, then hooray! If not, then something // is borked. default: fs.stat(p, function (er2, stat) { // if the stat fails, then that's super weird. // let the original error be the failure reason. if (er2 || !stat.isDirectory()) cb(er, made) else cb(null, made); }); break; } });
} </lang>
UNIX Shell
<lang bash>function mkdirp() { mkdir -p $1; }</lang>