# std/tempfiles

Theme:

- Manual
- Standard library
- Index
- Compiler docs
- Fusion docs
- devel, stable

Search:
Source Edit

This module creates temporary files and directories.

Experimental API, subject to change.

# Imports

os, random, syncio, posix

# Procs

    proc createTempDir(prefix, suffix: string; dir = ""): string {.
        ...raises: [OSError, IOError],
        tags: [ReadEnvEffect, ReadIOEffect, WriteDirEffect, ReadDirEffect],
        forbids: [].}

  Creates a new temporary directory in the directory `dir`.

  This generates a dir name using `genTempPath(prefix, suffix, dir)`, creates the directory and returns it, possibly after retrying to ensure it doesn't already exist.

  If failing to create a temporary directory, `OSError` will be raised.

  Note: It is the caller's responsibility to remove the directory when no longer needed.
  Note: `dir` must exist (empty `dir` will resolve to getTempDir).

  Example:

      import std/os
      doAssertRaises(OSError): discard createTempDir("", "", "nonexistent")
      let dir = createTempDir("tmpprefix_", "_end")
      # dir looks like: getTempDir() / "tmpprefix_YEl9VuVj_end"
      assert dirExists(dir)
      removeDir(dir)

  Source Edit

    proc createTempFile(prefix, suffix: string; dir = ""): tuple[cfile: File,
        path: string] {....raises: [OSError], tags: [ReadEnvEffect, ReadIOEffect],
                        forbids: [].}

  Creates a new temporary file in the directory `dir`.

  This generates a path name using `genTempPath(prefix, suffix, dir)` and returns a file handle to an open file and the path of that file, possibly after retrying to ensure it doesn't already exist.

  If failing to create a temporary file, `OSError` will be raised.

  Note: It is the caller's responsibility to close `result.cfile` and remove `result.file` when no longer needed.
  Note: `dir` must exist (empty `dir` will resolve to getTempDir).

  Example:

      import std/os
      doAssertRaises(OSError): discard createTempFile("", "", "nonexistent")
      let (cfile, path) = createTempFile("tmpprefix_", "_end.tmp")
      # path looks like: getTempDir() / "tmpprefix_FDCIRZA0_end.tmp"
      cfile.write "foo"
      cfile.setFilePos 0
      assert readAll(cfile) == "foo"
      close cfile
      assert readFile(path) == "foo"
      removeFile(path)

  Source Edit

    proc genTempPath(prefix, suffix: string; dir = ""): string {....raises: [],
        tags: [ReadEnvEffect, ReadIOEffect], forbids: [].}

  Generates a path name in `dir`.

  The path begins with `prefix` and ends with `suffix`.

  Note: `dir` must exist (empty `dir` will resolve to getTempDir).
  Source Edit