Iterators
In recent versions of PHP, there is an iterator that you can use for recursively go through a directory. The name of this iterator is RecursiveDirectoryIterator and below is a simple test use:
1 <?php
2
3 $Contentpath = realpath('/tmp/');
4 $Directory = new RecursiveDirectoryIterator($Contentpath);
5 $Iterator = new RecursiveIteratorIterator($Directory);
6
7 foreach($Iterator as $name => $object){
8 echo "$name\n";
9 }
10
11 ?>
the result is something like this:
# php test.php
/tmp/.
/tmp/..
/tmp/sess_td0p1cuohquk966fkit13fhi36
/tmp/sess_et3360aidupdnnifct0te2kr31
/tmp/sess_44rrgbn1em051u64bm49c6pmd2
/tmp/sess_42f9e0mhps120a72kco9nsbn81
/tmp/fresh.log
/tmp/.ICE-unix/.
/tmp/.ICE-unix/..
Filter
One of the benefits of this iterator, is that you can extend the RecursiveFilterIterator class to filter out unwanted values. Here is an example of the extend:
<?php
$Contentpath = realpath('./');
$Directory = new RecursiveDirectoryIterator($Contentpath);
class MyRecursiveFilterIterator extends RecursiveFilterIterator {
public function accept() {
return $this->current()->getFilename();
}
}
$MyFilter = new MyRecursiveFilterIterator($Directory);
$Iterator = new RecursiveIteratorIterator($MyFilter);
foreach($Iterator as $name => $object){
echo "$name\n";
}
?>
at the above example, we did not exclude or filter anything.
But our RecursiveIteratorIterator is now passing through our MyRecursiveFilterIterator !
TXT
Let’s filter out everything, but text files.
1 <?php
2 $Contentpath = realpath('./');
3 $Directory = new RecursiveDirectoryIterator($Contentpath);
4
5 class MyRecursiveFilterIterator extends RecursiveFilterIterator {
6 public function accept() {
7 $file_parts = pathinfo($this->current()->getFilename());
8
9 if ( $file_parts['extension'] == 'txt' ) {
10 return $this->current()->getFilename();
11 }
12
13 }
14 }
15
16 $MyFilter = new MyRecursiveFilterIterator($Directory);
17 $Iterator = new RecursiveIteratorIterator($MyFilter);
18
19 foreach($Iterator as $name => $object){
20 echo "$name\n";
21 }
22 ?>
There is a little caveat on the above example !
Seems that the above piece of code is working just fine for a specific directory, but when you are running it against a recursive directory, you are going to have errors like the below one:
PHP Notice: Undefined index: extension
and that’s why pathinfo will also run against directories !!!
Directories
So, we need to exclude - filter out all the directories:
1 <?php
2 $Contentpath = realpath('./');
3 $Directory = new RecursiveDirectoryIterator($Contentpath);
4
5 class MyRecursiveFilterIterator extends RecursiveFilterIterator {
6 public function accept() {
7
8 if ( $this->current()->isDir() )
9 return true;
10
11 $file_parts = pathinfo($this->current()->getFilename());
12
13 if ( $file_parts['extension'] == 'txt' ) {
14 return $this->current()->getFilename();
15 }
16
17 }
18 }
19
20 $MyFilter = new MyRecursiveFilterIterator($Directory);
21 $Iterator = new RecursiveIteratorIterator($MyFilter);
22
23 foreach($Iterator as $name => $object){
24 echo "$name\n";
25 }
26 ?>
pretty close.
Dots
Pretty close indeed, but we are not excluding the DOT directories:
.
..
FilesystemIterator
From the FilesystemIterator class we learn that there is a flag that does that:
const integer SKIP_DOTS = 4096 ;and you can use it on RecursiveDirectoryIterator as the recursive directory iterator is actually an extend of FilesystemIterator
RecursiveDirectoryIterator extends FilesystemIterator implements SeekableIterator , RecursiveIterator so our code is transforming to this one:
1 <?php
2 $Contentpath = realpath('./');
3 $Directory = new RecursiveDirectoryIterator($Contentpath,RecursiveDirectoryIterator::SKIP_DOTS);
4
5 class MyRecursiveFilterIterator extends RecursiveFilterIterator {
6 public function accept() {
7
8 if ( $this->current()->isDir() )
9 return true;
10
11 $file_parts = pathinfo($this->current()->getFilename());
12
13 if ( $file_parts['extension'] == 'txt' ) {
14 return $this->current()->getFilename();
15 }
16
17 }
18 }
19
20 $MyFilter = new MyRecursiveFilterIterator($Directory);
21 $Iterator = new RecursiveIteratorIterator($MyFilter);
22
23 foreach($Iterator as $name => $object){
24 echo "$name\n";
25 }
26 ?>
That’s It !
ffmpeg is an amazing piece of software.
Today I had to create a small video of a few Print-Screens (Screenshots) and this is how I did it:
I’ve renamed all my screenshot png files from a datetime format in their names, into a numeric order.
Screenshot_2017-01-25_13-16-31.png ---> Screenshot_01.png
Screenshot_2017-01-25_13-17-12.png ---> Screenshot_02.png
...
after that everything was really easy:
~> ffmpeg -i Screenshot_%2d.png output.mp4
Be careful not to use * wildcard but %2d (two digits) for ffmpeg to iterate through all images.
If your images are something like: 001.png then use %3d (three digits) in your ffmpeg command.
The above command will show us 25 frames per seconds, so …. if you have less than 25 images, you will have a full second to see the entire video!!!
Delay
Now it’s time to add a duration delay:
~> ffmpeg -framerate 1/2 -i Screenshot_%2d.png -r 21 output.mp4
that means, convert 21 images with a 2 second delay into output.mp4 video
post inspired from:
https://kushaldas.in/posts/tools-i-use-daily.html
https://www.scrye.com/wordpress/nirik/2017/01/05/tools-i-use-daily/
Operating System
I use Archlinux as my primary Operating System. I am currently running Archlinux (since 2009) in all my boxes (laptop/workpc/homepc/odroid-c1). In the data center, I have CentOS on the bare-metal, and CentOS in the VM(s). A windows VM exists for work purposes on my workpc.
Desktop
The last few years I am running fluxbox but I used to work on xfce. Thunar (xfce-file browser) is my first and only choice and lilyterm as my terminal emulator. tmux as my multiplexer. I used to run gnu screen for a decade !
I use arand for desktop layout (sharing my screen to external monitor or the TV).
Disk / FileSystem
All my disks are encrypted and I use both ext4 and btrfs on my systems. I really like btrfs (subvolumes) and I use the raid-0 and raid-1 but no raid-5 or raid-6 yet. I also have LVM on my laptop as I can not change the ssd easy.
Mostly Thunderbird but I still use mutt when using a terminal or an ssh session.
Editor + IDE
Vim 99% of my time.
for short-time notes: mousepad and when feeling to use a GUI, I use geany.
Browser
Multiple Instances of firefox, chromium, firefox - Nightly, Tor Browser and vimprobable2. I used to run midori but I’ve dropped it. I also have multiple profiles on firefox !!! I keep private-mode or incognito, all of them via a socks proxy (even Tor-Browser) with remote DNS (when possible).
IRC
Nope
but when needed, smuxi or pidgin
Blog / Website
flatpress no database, static pages but dynamic framework written in PHP. Some custom code on it but I keep a separated (off-the-web) clone with my custom changes. Recently added Markdown support and some JavaScript for code highlighting etc.
I dont tend to write a lot, but I keep personal notes on drafts (unpublished). I also keep a (wackowiki) wiki as a personal online keeping-notes wiki on my domain.
Version Control
Mostly mercurial but also git . I have a personal hg server (via ssh) for my code, files, notes, etc etc
Media
VLC only. For media and podcasts and mirage or feh for image display. gimp for image manipulation
Misc
Coffee
I wake up, I make my double espresso at home and drink it on commuting to work. The 20min distance gives coffee enough time to wake my brain. When at work, I mostly rant for everything.
and alcohol when needed ;)
PS:
My fluxbox menu has less than 15 apps, I’ve put there only my daily-use programs and I try to keep distractions on my desktop as minimum as possible. I keep disable notifications to apps and I mostly work on full screen to minimize input from running apps.