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 Wed Sep 18 21:18:57 UTC 2024 against commit c037883c03788357164e9846c84d9f777251495d9452a8e.

Current version is 6.3.4225 (develop) which has been verified against tests cases.