Return true if FILE starts with the right magic bytes.

Return #t if DIR exists and is a directory.

Return the name of locale category CATEGORY, one of the 'LC_' constants. If CATEGORY is a bitwise or of several 'LC_' constants, an approximation is returned.

Create DIRECTORY if it does not exist and copy FILE in there under the same name.

Open FILE as an ASCII or binary file, and pass the resulting port to PROC. FILE is closed when PROC's dynamic extent is left. Return the return values of applying PROC to the port.

Return the lexicographically sorted list of files under DIR for which PRED returns true. PRED is passed two arguments: the absolute file name, and its stat buffer; the default predicate always returns true. PRED can also be a regular expression, in which case it is equivalent to (file-name-predicate PRED). STAT is used to obtain file information; using 'lstat' means that symlinks are not followed. If DIRECTORIES? is true, then directories will also be included. If FAIL-ON-ERROR? is true, raise an exception upon error.

Remove from FILE occurrences of file names in STORE; return #t when store paths were encountered in FILE, #f otherwise. This procedure is known as `nuke-refs' in Nixpkgs.

Look for each of FILES of the given TYPE (a symbol as returned by 'stat:type') in INPUT-DIRS. Set ENV-VAR to a SEPARATOR-separated path accordingly. Example:

(set-path-environment-variable "PKG_CONFIG" '("lib/pkgconfig") (list package1 package2))

When PATTERN is not #f, it must be a regular expression (really a string) denoting file names to look for under the directories designated by FILES:

(set-path-environment-variable "XML_CATALOG_FILES" '("xml") (list docbook-xml docbook-xsl) #:type 'regular #:pattern "^catalog\\.xml$")

Return a procedure that returns true when its argument is a file starting with the bytes in HEADER, a bytevector.

Return #t if FILE exists and is executable.

Wrap the script PROG such that VARS are set first. The format of VARS is the same as in the WRAP-PROGRAM procedure. This procedure differs from WRAP-PROGRAM in that it does not create a separate shell script. Instead, PROG is modified directly by prepending a Guile script, which is interpreted as a comment in the script's language.

Special encoding comments as supported by Python are recreated on the second line.

Note that this procedure can only be used once per file as Guile scripts are not supported.

Copy SOURCE directory to DESTINATION. Follow symlinks if FOLLOW-SYMLINKS? is true; otherwise, just preserve them. Call COPY-FILE to copy regular files. When KEEP-MTIME? is true, keep the modification time of the files in SOURCE on those of DESTINATION. When KEEP-PERMISSIONS? is true, preserve file permissions. Write verbose output to the LOG port. Call (SELECT? FILE STAT) for each entry in source, where FILE is the entry's absolute file name and STAT is the result of 'lstat' (or 'stat' if FOLLOW-SYMLINKS? is true); exclude entries for which SELECT? does not return true.

Call PROC with a name of a temporary file and open output port to that file; close the file and delete it when leaving the dynamic extent of this call.