murex rocks

Welcome

About

Install

Change Log

Blog

Technical Docs

Language Tour

Interactive Shell

Rosetta Stone

User Guide

Open Source

Discuss

Contribute

Source Code

Search Site

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

• tmp

See Also

• Create Named Pipe (pipe): Manage Murex named pipes
• Open File (open): Open a file with a preferred handler
• Truncate File (>): Writes stdin to disk - overwriting contents if file already exists
• >> Append File: Writes stdin to disk - appending contents if file already exists

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