Create Temporary File (tmp)

Create a temporary file and write to it

Description

tmp creates a temporary file, writes the contents of stdin to it then returns its filename to stdout.

You can optionally specify a file extension, for example if the temporary file needs to be read by open or an editor which uses extensions to define syntax highlighting.

Usage

<stdin> -> tmp [ file-extension ] -> <stdout>

Examples

» out "Hello, world!" -> set tmp

» out $tmp
/var/folders/3t/267q_b0j27d29bnf6pf7m7vm0000gn/T/murex838290600/8ec6936c1ac1c347bf85675eab4a0877-13893

» open $tmp
Hello, world!

Detail

The temporary file name is a base64 encoded md5 hash of the time plus Murex function ID with Murex process ID appended:

package io

import (
    "crypto/md5"
    "encoding/hex"
    "io"
    "os"
    "strconv"
    "time"

    "github.com/lmorg/murex/lang"
    "github.com/lmorg/murex/lang/types"
    "github.com/lmorg/murex/utils/consts"
)

func init() {
    lang.DefineMethod("tmp", cmdTempFile, types.Any, types.String)
}

func cmdTempFile(p *lang.Process) error {
    p.Stdout.SetDataType(types.String)

    ext, _ := p.Parameters.String(0)
    if ext != "" {
        ext = "." + ext
    }

    fileId := time.Now().String() + ":" + strconv.Itoa(int(p.Id))

    h := md5.New()
    _, err := h.Write([]byte(fileId))
    if err != nil {
        return err
    }

    name := consts.TempDir + hex.EncodeToString(h.Sum(nil)) + "-" + strconv.Itoa(os.Getpid()) + ext

    file, err := os.Create(name)
    if err != nil {
        return err
    }

    defer file.Close()

    _, err = io.Copy(file, p.Stdin)
    if err != nil {
        return err
    }

    _, err = p.Stdout.Write([]byte(name))
    return err
}

This should should provide enough distance to run tmp in parallel….should you ever want to.

tmp files are also located inside a unique per-process Murex temp directory which itself is located in the appropriate temp directory for the host OS (eg $TMPDIR on macOS).

Synonyms

See Also


This document was generated from builtins/core/io/tmp_doc.yaml.

This site's content is rebuilt automatically from murex's source code after each merge to the master branch. Downloadable murex binaries are also built with the website.

Last built on Tue Dec 10 22:56:57 UTC 2024 against commit 60f05a260f05a227caf73dd5b3478e3cb3f4bb24e46745b.

Current version is 6.4.1005 (develop) which has been verified against tests cases.