Table of contents

May 11, 2026 ยท View on GitHub

babashka.fs

absolute?

(absolute? path)

Function.

Returns true if path is absolute via Path#isAbsolute.

Source

absolutize

(absolutize path)

Function.

Converts path into an absolute path via Path#toAbsolutePath.

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canonicalize

(canonicalize path)
(canonicalize path {:keys [:nofollow-links]})

Function.

Returns the canonical path for path via File#getCanonicalPath.

Options:

This function can be used as an alternative to real-path which requires files to exist.

Source

components

(components path)

Function.

Returns a seq of paths for all components of path. i.e.: split on the file-separator.

Source

copy

(copy source target-path)
(copy source target-path {:keys [replace-existing copy-attributes nofollow-links]})

Function.

Copies source file or input-stream to target-path dir or file via Files/copy.

Returns copied target file.

Options:

  • :replace-existing
  • :copy-attributes
  • :nofollow-links - used to determine to copy symbolic link itself or not.

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copy-tree

(copy-tree source-dir target-dir)
(copy-tree source-dir target-dir {:keys [:replace-existing :copy-attributes :nofollow-links], :as opts})

Function.

Copies entire file tree from source-dir to target-dir. Creates target-dir if needed.

Returns target-dir.

Options:

  • same as copy
  • :posix-file-permissions - string format unix-like system permissions passed to create-dirs when creating target-dir.

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create-dir

(create-dir dir)
(create-dir dir {:keys [:posix-file-permissions]})

Function.

Creates dir via Files/createDirectory. Does not create parents.

Returns dir.

Options:

  • :posix-file-permissions - string format for unix-like system permissions for dir, as described in str->posix. Affected by umask.

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create-dirs

(create-dirs dir)
(create-dirs dir {:keys [:posix-file-permissions]})

Function.

Creates dir via Files/createDirectories. Also creates parents if needed. Does not throw an exception if the dirs exist already. Similar to mkdir -p shell command.

Returns dir.

Options:

  • :posix-file-permissions - string format for unix-like system permissions for dir, as described in str->posix. Affected by umask.

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create-file

(create-file file)
(create-file file {:keys [:posix-file-permissions]})

Function.

Creates empty file via Files/createFile.

Returns file.

Options:

  • :posix-file-permissions - string format for unix-like system permissions for file, as described in str->posix. Affected by umask.

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(create-link link existing-file)

Function.

Creates a new hard link (directory entry) for an existing-file via Files/createLink.

Returns link.

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(create-sym-link link target-path)

Function.

Creates a symbolic link to target-path via Files/createSymbolicLink.

Returns link.

As of this writing, JDKs do not recognize empty-string target-path "" as the cwd. Consider instead using a target-path of "." to link to the cwd.

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create-temp-dir

(create-temp-dir)
(create-temp-dir {:keys [:dir :prefix :posix-file-permissions], :as opts})

Function.

Returns path to directory created via Files/createTempDirectory.

This function does not set up any automatic deletion of the directories it creates. See with-temp-dir for that functionality.

Options:

  • :dir - directory in which to create the new directory. Defaults to default system temp dir (e.g. /tmp); see temp-dir. Must already exist.
  • :prefix - provided as a hint to the process that generates the name of the new directory. In most cases, this will be the beginning of the new directory name. Defaults to a random (v4) UUID.
  • :posix-file-permissions - string format unix-like system permissions as described in str->posix for new directory. If not specified, uses the file system default permissions for new directories. Affected by umask.
  • :warning: :path - [DEPRECATED] previous name for :dir, kept for backwards compatibility. If both :path and :dir are given (don't do that!), :dir is used.

Examples:

  • (create-temp-dir)
  • (create-temp-dir {:posix-file-permissions "rwx------"})
  • (create-temp-dir {:dir (path (cwd) "_workdir") :prefix "process-1-"})

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create-temp-file

(create-temp-file)
(create-temp-file {:keys [:dir :prefix :suffix :posix-file-permissions], :as opts})

Function.

Returns path to empty file created via Files/createTempFile.

This function does not set up any automatic deletion of the files it creates. Create the file in a with-temp-dir for that functionality.

Options:

  • :dir - directory in which to create the new file. Defaults to default system temp dir (e.g. /tmp); see temp-dir. Must already exist.
  • :prefix - provided as a hint to the process that generates the name of the new file. In most cases, this will be the beginning of the new file name. Defaults to a random (v4) UUID.
  • :suffix - provided as a hint to the process that generates the name of the new file. In most cases, this will be the end of the new file name. Defaults to a random (v4) UUID.
  • :posix-file-permissions - string format unix-like system permissions for new file, as described in str->posix. If not specified, uses the file system default permissions for new files. Affected by umask.
  • :warning: :path - [DEPRECATED] Previous name for :dir, kept for backwards compatibility. If both :path and :dir are given (don't do that!), :dir is used.

Examples:

  • (create-temp-file)
  • (create-temp-file {:posix-file-permissions "rw-------"})
  • (create-temp-file {:dir (path (cwd) "_workdir") :prefix "process-1-" :suffix "-queue"})

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creation-time

(creation-time path)
(creation-time path {:keys [nofollow-links], :as opts})

Function.

Returns creation time of path as FileTime.

See README notes for some details on behaviour.

See also: set-creation-time, last-modified-time, file-time->instant, file-time->millis

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cwd

(cwd)

Function.

Returns current working directory path.

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delete

(delete path)

Function.

Deletes path via Files/delete. Returns nil if the delete was successful, throws otherwise. Does not follow symlinks.

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delete-if-exists

(delete-if-exists path)

Function.

Deletes path if it exists via Files/deleteIfExists. Returns true if the delete was successful, false if path didn't exist. Does not follow symlinks.

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delete-on-exit

(delete-on-exit path)

Function.

Requests delete of path on exit via File#deleteOnExit. Returns path.

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delete-tree

(delete-tree root-path)
(delete-tree root-path {:keys [force]})

Function.

Deletes the file tree at root-path using walk-file-tree. Similar to rm -rf shell command. Does not follow symlinks.

Returns root-path, or nil if root-path not found.

Options:

  • :force - if true forces deletion of read-only files/directories. Similar to chmod -R +wx + rm -rf shell commands.

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directory?

(directory? path)
(directory? path {:keys [:nofollow-links]})

Function.

Returns true if path is a directory via Files/isDirectory.

Options:

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ends-with?

(ends-with? this-path other-path)

Function.

Returns true if this-path ends with other-path via Path#endsWith.

See also: starts-with?

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exec-paths

(exec-paths)

Function.

Returns a vector of command search paths (from the PATH environment variable). Same as (split-paths (System/getenv "PATH")).

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executable?

(executable? path)

Function.

Returns true if path is executable via Files/isExecutable.

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exists?

(exists? path)
(exists? path {:keys [:nofollow-links]})

Function.

Returns true if path exists via Files/exists.

Options:

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expand-home

(expand-home path)

Function.

Returns path replacing ~ (tilde) with home dir.

If path:

  • does not start with ~, returns path.
  • starts with ~ then file-separator, ~ is replaced with (home). e.g., ~/foo -> /home/myuser/foo
  • starts with ~ then some other chars, those other chars are assumed to be a username, then naively expanded to (home username). e.g., ~someuser/foo -> /home/someuser/foo

See also: home

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extension

(extension path)

Function.

Returns the extension of path via split-ext.

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file

(file path)
(file path & paths)

Function.

Coerces path(s) into a File, combining multiple paths into one. Multiple-arg versions treat the first argument as parent and subsequent args as children relative to the parent.

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file-name

(file-name path)

Function.

Returns the name of the file or directory for path via File#getName. E.g. (file-name "foo/bar/baz") returns "baz".

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file-separator

The system-dependent default path component separator character (as string) via File/separator.

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file-time->instant

(file-time->instant ft)

Function.

Converts ft FileTime to an Instant.

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file-time->millis

(file-time->millis ft)

Function.

Converts ft FileTime to epoch milliseconds (long).

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get-attribute

(get-attribute path attribute)
(get-attribute path attribute {:keys [:nofollow-links]})

Function.

Returns value of attribute for path via Files/getAttribute.

Options:

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glob

(glob root-dir pattern)
(glob root-dir pattern opts)

Function.

Returns a vector of paths matching glob pattern (on path and filename) relative to root-dir. Patterns containing ** or / will cause a recursive walk under root-dir, unless overriden with :recursive false. Similarly, :hidden will be automatically enabled when pattern starts with a dot. Glob interpretation is done using the rules described in FileSystem#getPathMatcher

Options:

  • :hidden - match hidden paths. Implied true when pattern starts with a dot; otherwise, defaults to false. Note: on Windows files starting with a dot are not hidden, unless their hidden attribute is set.
  • :follow-links - follow symlinks. Defaults to false.
  • :recursive - implied true when pattern contains ** or /; otherwise, defaults to false.
    • true - pattern is matched against all descendant files and directories under root-dir
    • false - pattern is matched only against immediate children under root-dir
  • :max-depth - max depth to descend into directory structure, when recursing. Defaults to Integer/MAX_VALUE.

Examples:

  • (fs/glob "." "**.clj") - finds .clj files and dirs under . dir and its subdirs
  • (fs/glob "." "**.clj" {:recursive false}) - finds .clj files and dirs immediately under . dir only
  • (fs/glob "." "*.clj" {:recursive true}) - finds .clj files and dirs immediately under . only (pattern lacks directory wildcards)

If on macOS, see note on glob

See also: match

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gunzip

(gunzip gz-file)
(gunzip gz-file target-dir)
(gunzip gz-file target-dir {:keys [replace-existing]})

Function.

Extracts gz-file to target-dir.

If target-dir not specified (or nil) defaults to gz-file dir.

File is extracted to target-dir with gz-file file-name without .gz extension.

Creates target-dir dir(s) if necessary. The gz-file is not deleted.

Returns the extracted file.

Options:

  • :replace-existing - when true overwrites existing file

See also: gzip

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gzip

(gzip source-file)
(gzip source-file {:keys [dir out-file]})

Function.

Gzips source-file to :dir/:out-file.

Does not store the source-file name in the .gz file. The source-file is not deleted.

Returns the created gzip file.

Options:

  • :dir(s) - created if necessary. If not specified, defaults to source-file dir.
  • :out-file - if not specified, defaults to source-file file-name with .gz extension.

See also: gunzip

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hidden?

(hidden? path)

Function.

Returns true if path is hidden via Files/isHidden.

TIP: some older JDKs can throw on empty-string path (hidden ""). Consider instead checking cwd via (hidden ".").

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home

(home)
(home user)

Function.

Returns home dir path.

With no arguments, returns the current value of the user.home system property. If a user is passed, returns that user's home directory as found in the parent of home with no args.

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instant->file-time

(instant->file-time instant)

Function.

Converts instant Instant to a FileTime.

Source

last-modified-time

(last-modified-time path)
(last-modified-time path {:keys [nofollow-links], :as opts})

Function.

Returns last modified time of path as FileTime.

See also: set-last-modified-time, creation-time, file-time->instant, file-time->millis

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list-dir

(list-dir dir)
(list-dir dir glob-or-accept)

Function.

Returns a vector of all paths in dir. For descending into subdirectories use glob.

  • glob-or-accept - a glob string such as "*.edn" or a (fn accept [^java.nio.file.Path p]) -> truthy

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list-dirs

(list-dirs dirs glob-or-accept)

Function.

Similar to list-dir but accepts multiple roots in dirs and returns the concatenated results.

  • glob-or-accept - a glob string such as "*.edn" or a (fn accept [^java.nio.file.Path p]) -> truthy

Source

match

(match root-dir pattern)
(match root-dir pattern {:keys [hidden follow-links max-depth recursive]})

Function.

Returns a vector of paths matching pattern (on path and filename) relative to root-dir. Pattern interpretation is done using the rules described in FileSystem#getPathMatcher

Options:

  • :hidden - match hidden paths - note: on Windows paths starting with a dot are not hidden, unless their hidden attribute is set. Defaults to false, i.e. skip hidden files and folders.
  • :follow-links - follow symlinks. Defaults to false.
  • :recursive
    • true - pattern is matched against all descendant files and directories under root-dir
    • false (default) - pattern is matched only against immediate children under root-dir
  • :max-depth - max depth to descend into directory structure, when matching recursively. Defaults to Integer/MAX_VALUE.

Examples:

  • (fs/match "." "regex:.*\\.clj" {:recursive true})

See also: glob

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millis->file-time

(millis->file-time millis)

Function.

Converts epoch milliseconds (long) to a FileTime.

Source

modified-since

(modified-since anchor-path path-set)

Function.

Returns seq of regular files (non-directories, non-symlinks) from path-set that were modified since the anchor-path. The anchor-path can be a regular file or directory, in which case the recursive max last modified time stamp is used as the timestamp to compare with. The path-set may be a regular file, directory or collection of paths (e.g. as returned by glob). Directories are searched recursively.

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move

(move source-path target-path)
(move source-path target-path {:keys [:replace-existing :atomic-move]})

Function.

Moves or renames dir or file at source-path to target-path dir or file via Files/move. If target-path is a directory, moves source-path under target-path. Never follows symbolic links.

Returns target-path.

Options:

  • replace-existing - overwrite existing target-path, default false
  • atomic-move - watchers will only see complete target-path file, default false

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normalize

(normalize path)

Function.

Returns normalized path for path via Path#normalize.

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owner

(owner path)
(owner path {:keys [:nofollow-links]})

Function.

Returns the owner of path via Files/getOwner. Call str on return value to get the owner name as a string.

Options:

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parent

(parent path)

Function.

Returns parent path of path via Path#getParent. Akin to dirname in bash.

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path

(path path)
(path parent child)
(path parent child & more)

Function.

Coerces path(s) into a Path, combining multiple paths into one. Multiple-arg versions treat the first argument as parent and subsequent args as children relative to the parent.

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path-separator

The system-dependent path-separator character (as string) via File/pathSeparator.

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posix->str

(posix->str p)

Function.

Converts a set of PosixFilePermission p to a string, like "rwx------" via PosixFilePermissions/toString.

See also: str->posix

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posix-file-permissions

(posix-file-permissions path)
(posix-file-permissions path {:keys [:nofollow-links]})

Function.

Returns a set of PosixFilePermission for path via Files/getPosixFilePermissions. Use posix->str to convert to a string.

Options:

See also: set-posix-file-permissions

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read-all-bytes

(read-all-bytes file)

Function.

Returns contents of file as byte array via Files/readAllBytes.

Source

read-all-lines

(read-all-lines file)
(read-all-lines file {:keys [charset], :or {charset "utf-8"}})

Function.

Returns contents of file as a vector of lines via Files/readAllLines.

Options:

  • :charset - defaults to "utf-8"

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read-attributes

(read-attributes path attributes)
(read-attributes path attributes {:keys [:nofollow-links :key-fn], :as opts})

Function.

Same as read-attributes* but returns requested attributes for path as a map with keywordized attribute keys.

Options:

  • :key-fn - optionally override keywordizing function with your own.
  • :nofollow-links

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read-attributes*

(read-attributes* path attributes)
(read-attributes* path attributes {:keys [:nofollow-links]})

Function.

Returns requested attributes for path via Files/readAttributes.

Options:

Source

(read-link sym-link-path)

Function.

Returns the immediate target of sym-link-path via Files/readSymbolicLink. The target need not exist.

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readable?

(readable? path)

Function.

Returns true if path is readable via Files/isReadable

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real-path

(real-path path)
(real-path path {:keys [:nofollow-links]})

Function.

Converts path into real path via Path#toRealPath.

Options:

Source

regular-file?

(regular-file? path)
(regular-file? path {:keys [:nofollow-links]})

Function.

Returns true if path is a regular file via Files/isRegularFile.

Options:

Source

relative?

(relative? path)

Function.

Returns true if path is relative (in other words, is not absolute?).

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relativize

(relativize base-path other-path)

Function.

Returns other-path relative to base-path via Path#relativize.

Examples:

  • (fs/relativize "a/b" "a/b/c/d") => c/d
  • (fs/relativize "a/b/c/d" "a/b") => ../..

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root

(root path)

Function.

Returns root path for path, or nil, via Path#getRoot.

The return value depends upon the runtime platform.

On Windows, returns Windows specific roots, ex: (replace forward slash with backslash):

  • C:/ for C:/foo/bar
  • C: for C:foo/bar
  • //server/share for //server/share/foo/bar

On Linux and macOS, returns the leading / for anything that looks like an absolute path.

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same-file?

(same-file? this-path other-path)

Function.

Returns true if this-path is the same file as other-path via Files/isSamefile.

Source

set-attribute

(set-attribute path attribute value)
(set-attribute path attribute value {:keys [:nofollow-links]})

Function.

Sets attribute for path to value via Files/setAttribute.

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set-creation-time

(set-creation-time path time)
(set-creation-time path time {:keys [nofollow-links], :as opts})

Function.

Sets creation time of path. time can be epoch milliseconds (long), FileTime, or Instant.

Options:

See README notes for some details on behaviour.

See also: creation-time

Source

set-last-modified-time

(set-last-modified-time path time)
(set-last-modified-time path time {:keys [nofollow-links], :as opts})

Function.

Sets last modified time of path. time can be epoch milliseconds (long), FileTime, or Instant.

See also: last-modified-time

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set-posix-file-permissions

(set-posix-file-permissions path posix-file-permissions)

Function.

Sets posix-file-permissions on path via Files/setPosixFilePermissions. Accepts a string like "rwx------" or a set of PosixFilePermission.

See also: posix-file-permissions

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size

(size path)

Function.

Returns the size of path in bytes.

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split-ext

(split-ext path)
(split-ext path {:keys [ext]})

Function.

Splits path on extension. Returns [name ext]. Leading directories in path are not processed.

Options:

  • :ext - split on specified extension (do not include a leading dot)

Examples:

  • (fs/split-ext "foo.bar.baz") => ["foo.bar" "baz"]
  • (fs/split-ext "foo.bar.baz" {:ext "bar.baz"}) => ["foo" "bar.baz"]
  • (fs/split-ext "foo.bar.baz" {:ext "png"}) => ["foo.bar.baz" nil]

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split-paths

(split-paths joined-paths)

Function.

Splits joined-paths string into a vector of paths by OS-specific path-separator.

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starts-with?

(starts-with? this-path other-path)

Function.

Returns true if this-path starts with other-path via Path#startsWith.

See also: ends-with?

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str->posix

(str->posix s)

Function.

Converts string s to a set of PosixFilePermission via PosixFilePermissions/fromString.

s is a string like "rwx------".

See also: posix->str

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strip-ext

(strip-ext path)
(strip-ext path {:keys [ext], :as opts})

Function.

Strips extension from path via split-ext.

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(sym-link? path)

Function.

Returns true if path is a symbolic link via Files/isSymbolicLink.

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temp-dir

(temp-dir)

Function.

Returns java.io.tmpdir property as path.

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touch

(touch path)
(touch path {:keys [time nofollow-links], :as opts})

Function.

Updates last modified time of path to :time, creating path as a file if it does not exist.

If path is deleted by some other process/thread before :time is set, a NoSuchFileException will be thrown. Callers can, if their use case requires it, implement their own retry loop.

Options:

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unixify

(unixify path)

Function.

Returns path as string with Unix-style file separators (/).

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unzip

(unzip zip-file)
(unzip zip-file target-dir)
(unzip zip-file target-dir {:keys [replace-existing extract-fn]})

Function.

Unzips zip-file to target-dir (default ".").

Returns target-dir.

Options:

  • :replace-existing - true / false: overwrite existing files
  • :extract-fn - function that decides if the current ZipEntry should be extracted. Extraction only occurs if a truthy value is returned (i.e. not nil/false). The function is only called for files (not directories) with a single map arg:
    • :entry - the current ZipEntry
    • :name - the name of the ZipEntry (result of calling getName)

See also: zip.

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update-file

(update-file file f & xs)
(update-file file opts f & xs)

Function.

Updates the contents of text file with result of applying function f with old contents and args xs. Returns the new contents.

Options:

  • :charset - charset of file, default to "utf-8"

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walk-file-tree

(walk-file-tree path {:keys [:pre-visit-dir :post-visit-dir :visit-file :visit-file-failed :follow-links :max-depth]})

Function.

Walks path via Files/walkFileTree.

Options:

  • :follow-links
  • :max-depth - maximum directory depth to walk, defaults is unlimited
  • Override default visitor functions via:
    • :pre-visit-dir - args [dir attrs]
    • :post-visit-dir - args [dir ex]
    • :visit-file - args [file attrs]
    • :visit-file-failed - args [file ex]

All visitor functions must return one of :continue, :skip-subtree, :skip-siblings or :terminate. A different return value will throw. When not supplied, visitor functions default to (constantly :continue).

Returns path.

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which

(which program)
(which program opts)

Function.

Returns path to first executable program found in :paths, similar to the which Unix command.

When program is a relative or absolute path, :paths option is not consulted. On Windows, the :win-exts variants are still searched. On other OSes, the path for program will be returned if executable, else nil.

Options:

  • :paths - paths to search, default is return of (exec-paths)
  • :win-exts - active on Windows only. Searches for program with filename extensions specified in :win-exts option. If program already includes an extension from :win-exts, it will be searched as-is first. Default is ["com" "exe" "bat" "cmd"].

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which-all

(which-all program)
(which-all program opts)

Function.

Returns a vector of every path to program found in (exec-paths). See which.

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windows?

(windows?)

Function.

Returns true if OS is Windows.

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with-temp-dir

(with-temp-dir [temp-dir] & body)
(with-temp-dir [temp-dir opts] & body)

Macro.

Evaluates body with temp-dir bound to the result of (create-temp-dir opts).

By default, the temp-dir will be removed with delete-tree on exit from the scope.

Options:

  • see create-temp-dir for options that control directory creation
  • :keep - if true does not delete the directory on exit from macro scope.

Example:

(with-temp-dir [d]
  (let [t (path d "extract")
    (create-dir t)
    (gunzip path-to-zip t)
    (copy (path t "the-one-file-I-wanted.txt") (path permanent-dir "file-I-extracted.txt"))))
;; d no longer exists here

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writable?

(writable? path)

Function.

Returns true if path is writable via Files/isWritable

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write-bytes

(write-bytes file bytes)
(write-bytes file bytes {:keys [append create truncate-existing write], :as opts})

Function.

Writes bytes to file via Files/write.

Options:

  • :create - (default true)
  • :truncate-existing - (default true)
  • :write - (default true)
  • :append - (default false)
  • or any java.nio.file.StandardOption.

Examples:

(fs/write-bytes f (.getBytes (String. "foo"))) ;; overwrites + truncates or creates new file
(fs/write-bytes f (.getBytes (String. "foo")) {:append true})

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write-lines

(write-lines file lines)
(write-lines file lines {:keys [charset], :or {charset "utf-8"}, :as opts})

Function.

Writes lines, a seqable of strings, to file via Files/write.

Options:

  • :charset - (default "utf-8")

Open options:

  • :create - (default true)
  • :truncate-existing - (default true)
  • :write - (default true)
  • :append - (default false)
  • or any java.nio.file.StandardOption.

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xdg-cache-home

(xdg-cache-home)
(xdg-cache-home app)

Function.

Returns path to user-specific non-essential data as described in the XDG Base Directory Specification.

Uses env-var XDG_CACHE_HOME (if set and representing an absolute path), else (fs/path (fs/home) ".cache"). When provided, appends app to the returned path.

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xdg-config-home

(xdg-config-home)
(xdg-config-home app)

Function.

Returns path to user-specific configuration files as described in the XDG Base Directory Specification.

Uses env-var XDG_CONFIG_HOME (if set and representing an absolute path), else (fs/path (fs/home) ".config"). When provided, appends app to the returned path.

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xdg-data-home

(xdg-data-home)
(xdg-data-home app)

Function.

Returns path to user-specific data files as described in the XDG Base Directory Specification.

Uses env-var XDG_DATA_HOME (if set and representing an absolute path), else (fs/path (fs/home) ".local" "share"). When provided, appends app to the returned path.

Source

xdg-state-home

(xdg-state-home)
(xdg-state-home app)

Function.

Returns path to user-specific state files as described in the XDG Base Directory Specification.

Uses env-var XDG_STATE_HOME (if set and representing an absolute path), else (fs/path (fs/home) ".local" "state"). When provided, appends app to the returned path.

Source

zip

(zip zip-file path-or-paths)
(zip zip-file path-or-paths opts)

Function.

Zips path-or-paths into zip-file. A path may be a file or directory. Directories are included recursively and their names are preserved in the zip file. Currently only accepts relative paths.

Returns created zip-file.

Options:

  • :root - optional directory to be elided in zip-file entries. E.g.: (fs/zip ["src"] {:root "src"})
  • :path-fn - an optional custom path conversion function. A single-arg function called for each file system path returning the path to be used for the corresponding zip entry.

See also: unzip.

Source