cromite/jsmin

JSMin - JavaScript Minifier | jsmin.exe & source-code

JSMin

This repository contains the Windows application jsmin.exe and the jsmin function. If you just want to use the jsmin command, just download jsmin.exe or compile yourself.

Compilation example

For Windows, please add the extension .exe

gcc jsmin.c lib/jsmin.c -o jsmin

Command

This command erases extra whitespace and comments in the javascript code, making it one line and reducing the file size.

Before

var sample = 100
log(sample)

// sample function
function log(num) {
  if (num > 50) {
    console.log("examples of use")
  } else num += 20
}

After

var sample=100;log(sample);function log(num){if(num>50){console.log("examples of use")}else num+=20}

Usage

jsmin example.js

When a file name is specified in the command line argument of jsmin, a file such as example.min.js is created in the same directory, and the compression result is output to this file.

jsmin input.js -o output.js

You can also specify the destination file with the -o (--output) option. You can also write jsmin -o output.js input.js.

jsmin example.js -w

In addition, the -w (--overwerite) option will overwrite the original file without creating a new file.You can also write jsmin -w example.js.

jsmin -h

Use the -h (--help) option to see how to use jsmin

Usage: jsmin <file> [options...]

Options:
  -o, --output <file>  write to <file> instead of writing in '...min.js'
  -w, --overwrite      overwrite the file
  -h, --help           get help for commands
  -v, --version        show jsmin version

Jsmin function

#include "lib/jsmin.h"

char *jsmin(char *code)

Parameters:

code - Original javascript code

Returns:

Minified javascript code

Example

Directory
 ├ example.c
 └ lib
    ├ jsmin.h
    └ jsmin.hc

// example.c

#include <stdio.h>
#include "lib/jsmin.h"

int main() {

    FILE *fp = fopen("example.js", "r+");
    
    // Get the contents of example.js
    int i = 0;
    char code[100000];
    while((code[i] = fgetc(fp)) != EOF) i++;
    code[i] = '\0';

    char *result = jsmin(code); // <-- Minify the code here

    // Overwrite the file
    fputs(result, fp);
    fclose(fp);

    return 0;
}

Compile

gcc example.c lib/jsmin.c -o jsmin

This console application minifies example.js by overwriting it.