Create a patch file:

• Locate the file we want to change, eg. path/file.json
• Create a copy of the file and edit it in the same directory, eg. path/file.new.json
• Create the diff file by running the program diff, eg.

  diff -u path/file.json path/file.new.json > file.json.diff

• Ensure or change the first lines of the diff file in order to point to the desired files, eg. path/file.json to build/path/file.json
• Apply the patch by running the program patch, eg.

  patch -p0 < file.json.diff

Notes:

• Both programs, diff and patch, should be part of the core programs on any linux distribution
• The -u option specifies that the created file is of unified type
• The -p0 options specifies that the full paths inside the first lines of the diff file should be used

done_

Every single time you have a input text field and submit-like button next to it, at some point, you would like to bind the same action of the submit button to the press of the enter key.

It's trivial, but also it's simply better to just copy-paste it. So here its is:

function onenter(ele, f) {
	ele.addEventListener('keydown', function (e) {
		if (e.keyCode === 13) { f(e); e.preventDefault(); }
	})
}

And also while we are here, instead of using the-not-be-named lib, just use these:

function q(x) { return document.querySelector(x); }
function qa(x) { return [...document.querySelectorAll(x)]; }
function range(x) { return Array.from({length: x}, (v, i) => i); }

For more just go here.

done_

As a follow up of the "Bash: Easy help print", lets do the same thing. So I will just copy the whole text and replace what needs replacing...

Ok, lets create a single line of python that will handle the -h option and print something.

First, what to print? I usually add some comments on the start of the file, so lets print that. Example script:

#!/bin/env python3
#
#  This is the doc of the script
#

the line that we will add

code of script

Lets go step by step. We need to print the file it self:

h = open(args[0], 'r').read()
print(h)

Skip the first line (lets skip the read):

print(h[h.index('\n')+1:])	

Go until you find the first empty line:

print(h[h.index('\n')+1:h.index('\n\n')]

Remove the # fro the start of the line:

.replace('#','')

Finally, we check if the -h is the first argument, print the thing and exit:

if '-h' in args: h = open(args[0], 'r').read(); print(h[h.index('\n')+1:h.index('\n\n')].replace('#','')); exit()

done_

The classic way to have a drop-down list in html is the select tag.

However there are two main problems/inconvenient. The select tag will only allow to select one item and you cannot type for a not included option or just to filter the list options. Also sometimes just have all the input fields under the same tag name <input> is just niter.

An other way is the <datalist>, that for some reason I learned about it lately (sad).

The classic example:

<input list="hashes">
<datalist id="hashes">
  <option value="sha1">
  <option value="sha256">
  <option value="sha512">
</datalist>

done_ 

Need to just plot a file with numbers? Stop using matl@b or exc€l.

All we need is a couple lines of Python code:

import matplotlib.pyplot as p

p.plot(values)
p.show()

And for the values (if you have the number with new-line separating them) with either a file as an argument of just the stdin couple more lines:

import sys

stream = sys.stdin
if len(sys.argv) > 1:
    stream = open(sys.argv[1], 'r')

values = [float(line) for line in stream]

done_

Ok, lets create a single line of bash that will handle the -h option and print something.

First, what to print? I usually add some comments on the start of the file, so lets print that. Example script:

#!/bin/bash
#
#  This is the doc of the script
#

the line that we will add

code of script

Lets go step by step. We need to print the file it self:

cat "$0"

Skip the first line (lets switch to sed):

sed -n '2,$ p' "$0"

Go until you find the first empty line:

sed -n '2,/^$/ p' "$0"

Remove the # fro the start of the line:

sed '2,/^$/ s/#// p' "$0"

Finally, we check if the -h is the first argument, print the thing and exit:

[ "$1" = '-h' ] && sed -n '2,/^$/ s/#// p' "$0" && exit

done_

public class Time implements Serializable {

    private long duration;
    private long start;

    // crazy things

}

    private void writeObject(java.io.ObjectOutputStream out) throws ... {
        Map map = new HashMap<>();

        map.put("duration", duration);
        map.put("start", start);
        out.writeObject(map);
    }

    private void readObject(java.io.ObjectInputStream in) throws ... {
        Map map = (java.util.Map) in.readObject();

        duration = (long) map.get("duration");
        start = (long) map.get("start");
    }

    public static final long serialVersionUID = 1L;

    private TimeUnit unit;  // v.2

    private void writeObject(java.io.ObjectOutputStream out) throws ... {
        Map map = new HashMap<>();

        map.put("duration", duration);
        map.put("start", start);
        map.put("unit", unit);
        out.writeObject(map);
    }

    private void readObject(java.io.ObjectInputStream in) throws ... {
        Map map = (Map) in.readObject();

        duration = (long) map.get("duration");
        start = (long) map.get("start");
        if (map.containsKey("unit")) {
            unit = (TimeUnit) map.get("unit");
        } else {
            // TODO unit
        }
    }

    unit = TimeUnit.Milliseconds

public class SuperIterator<T> implements Iterator<T>, Iterable<T> {

@Override
public Iterator<Character> iterator() {
    return this;
}

xcopy C:\From C:\To /D /E /I /H /Y /G

Desktop.getDesktop().browse(new URL("http://maanoo.com").toURI());

var canvas = document.getElementById("canvas");
var c = canvas.getContext("2d");

c.fillRect
c.fillText
c.strokeRect
c.strokeText

c.fillCircle
c.strokeCircle

CanvasRenderingContext2D.prototype.fillCircle = function(x, y, r) {
  this.beginPath();
  this.arc(x, y, r, 0, 2 * Math.PI);
  this.fill();
};

CanvasRenderingContext2D.prototype.strokeCircle = function(x, y, r) {
  this.beginPath();
  this.arc(x, y, r, 0, 2 * Math.PI);
  this.stroke();
};

private static final String NAME = "...";
public static SharedPreferences getPreferences(Activity a) {
  return a.getSharedPreferences(NAME , Context.MODE_PRIVATE);
}

public static void save(Activity a) {
  SharedPreferences.Editor sp = getPreferences(a).edit();

  sp.putString("name1", value1);
  sp.putInt("name2", value2);

  sp.commit();
}

public static void load(Activity a) {
  SharedPreferences sp = getPreferences(a);

  value1 = sp.getString("name1", default1);
  value2 = sp.getInt("name2", default2);
}

getPreferences(Context.MODE_PRIVATE)

localStorage["name"] = value;

value = localStorage["name"];

localStorage["name"] = JSON.stringify(object);

object = JSON.parse(localStorage["name"]);

$(".item")

document.querySelectorAll(".item")

function q(query) {
  return document.querySelectorAll(query);
}

q(".item")

<?php
  $path = "./counter.txt";
  $count = intval(file_get_contents($path));
  if(isset($_GET["add"])) {
    $count++;
    file_put_contents($path, $count);
  }
  echo $count;
?>

*{
  transition: all 0.7s ease-in-out;
}

value = value % 360

value = (value - min) % (max - min) + min

value = ((value % 360) + 360) % 360

value = ((value - min) % (max - min) + max - min) % (max - min) + min

len = max - min
value = ((value - min) % len + len) % len + min