articles/gify-back-to-bash-scripting.md

   1 ---
   2 title: gify.sh – back to bash scripting
   3 author: Danilo M.
   4 type: post
   5 date: 2016-01-25T12:41:06+00:00
   6 url: /2016/01/gify-back-to-bash-scripting/
   7 featured_image: /wp-content/uploads/2016/01/G0092546.jpg
   8 categories:
   9   - code
  10   - diy
  11   - fotografia
  12 tags:
  13   - bash
  14   - convert
  15   - gif
  16   - imagemagik
  17   - mogrify
  18   - script
  19
  20 ---
  21 <div class="wp-block-image size-full wp-image-3645">
  22   <figure class="aligncenter"><img loading="lazy" width="900" height="675" src="https://danix.xyz/wp-content/uploads/2016/01/piscaturi.gif" alt="" class="wp-image-3645" /><figcaption>gif image created using gify.sh</figcaption></figure>
  23 </div>
  24
  25 Today I&#8217;ll present you a useful script that will help you create amazing gifs from your still photos using a couple tools from the <a href="https://www.imagemagick.org" target="_blank" rel="noopener noreferrer">IMAGEMAGIK</a> suite, so without further ado, here it is, straight from github&#8217;s gists.
  26
  27 <div class="wp-block-buttons aligncenter">
  28   <div class="wp-block-button">
  29     <a class="wp-block-button__link" href="" target="_blank" rel="noreferrer noopener">download in zip format</a>
  30   </div>
  31 </div>
  32
  33 what the code does is quite simple, it takes a few arguments and helps you resize your images&nbsp;while keeping the original proportions. Put the code in your path and let&#8217;s put it to work.
  34
  35 <!--more-->
  36
  37 For this example we&#8217;ll pretend you have a bunch of jpg pictures, maybe something you shot while travelling france,&nbsp;put&nbsp;them&nbsp;in a folder and run the script like this:
  38
  39 <pre class="wp-block-code language-bash"><code>gify.sh --resize 900 jpg</code></pre>
  40
  41 depending on the amount of images it may take a while, and when it&#8217;s done you&#8217;ll have all of your jpg resized to 900px wide and with proportional height.
  42
  43 now it&#8217;s time to render all of your jpg into one animated gif so, while in the same directory, run the script like this:
  44
  45 <pre class="wp-block-code language-bash"><code>gify.sh --gif 10 jpg paris</code></pre>
  46
  47 the parameters now are a bit different, first we tell the script that we want to create a gif with the `--gif` option, then we tell the interval between every frame, that number is expressed in 100th of a second, so now we are telling the gif to change frame every 10/100 of second, the following parameter is the extension of the images we&#8217;ll be using, in our example is jpg (it&#8217;s case sensitive, so make sure all the images you want to use have the same extension), and finally we set the name of the gif, without the extension, the script will provide it for us.
  48
  49 The gif you see at the beginning of the article was created with this script.
  50
  51 I made this script mostly for fun and personal use, so it&#8217;s absolutely not idiot proof, can be improved but for me it works just fine. If you want to modify it, feel free to fork it on github or just download it and do whatever you like with it, and if you want to share it with me, use the comment form below.
  52
  53 I&#8217;ll leave you with a copy of the script here in case you want to have a look at it before downloading.
  54 Enjoy!
  55
  56 <pre class="wp-block-code language-bash"><code>#! /bin/bash
  57
  58 # Author:       Danilo 'danix' Macri
  59 # Author URI:   https://danix.xyz
  60 # Script URI:   https://danix.xyz/?p=3545
  61 # License:      GPL2
  62 # License URI:  https://www.gnu.org/licenses/gpl-2.0.html
  63
  64 #--------------------------------------------------------------------------------#
  65 #                                                                                #
  66 #             GIFY.SH - CREATE ANIMATED GIFS OUT OF A BUNCH OF IMAGES            #
  67 #                                                                                #
  68 # Use this script to create animated looping gifs from a bunch of images. You    #
  69 # just need to arrange all the images you want to use inside a folder and then   #
  70 # launch this script with a few options and you'll have your gif within seconds. #
  71 #                                                                                #
  72 # This script uses mogrify and convert from the IMAGEMAGIK suite to deliver the  #
  73 # gifs. This script can proportionally resize your images to help you create a   #
  74 # lighter file.                                                                  #
  75 #                                                                                #
  76 #--------------------------------------------------------------------------------#
  77
  78 # ERROR & EXIT STATUSES
  79 SHOWHELP=61
  80 USERABORTED=62
  81
  82 E_INTERROR=71
  83 E_NOOPTS=72
  84 E_NOARGS=73
  85 E_FILEXISTS=74
  86 E_NOIMAGES=75
  87 E_UNKNOWNOPT=76
  88
  89 # TOOLS
  90 PWD=$(pwd)
  91 MOGRIFY=$(which mogrify)
  92 CONVERT=$(which convert)
  93
  94 # we need mogrify and convert from the imagemagik toolset for this script to work
  95 if &#91;&#91; ! -x $MOGRIFY || ! -x $CONVERT ]]; then
  96     showerror missingdeps
  97     exit $E_MISSINGDEPS
  98 fi
  99
 100
 101 # showhelp
 102 showhelp ()
 103 {
 104 case $1 in
 105     resize )
 106         echo "USAGE: $(basename $0) -r | --resize &#91;width] &#91;extension]"
 107         ;;
 108     gif )
 109         echo "USAGE: $(basename $0) -g | --gif &#91;delay] &#91;extension] &#91;output file name]"
 110         ;;
 111     * )
 112                 #|----------------------- TEXT MAX WIDTH - 80 CHARS ----------------------------|
 113         echo -e "$(basename $0) - create animated gifs from images inside current directory"
 114         echo -e "USAGE: $(basename $0) &lt;option> &#91;arguments]"
 115         echo -e "\twhere &lt;option> is one between:";echo
 116         echo -e "\t-r | --resize &#91;width] &#91;extension]"
 117         echo -e "\t\tresizes all the images matching the extension in the current folder to"
 118         echo -e "\t\tthe width specified as argument.";echo
 119         echo -e "\tg | --gif &#91;delay] &#91;extension] &#91;output file name]"
 120         echo -e "\t\tcreates the gif file using all the images in the current folder."
 121         echo
 122         echo -e "EXAMPLES:"
 123         echo -e "$(basename $0) --resize 900 jpg"
 124         echo -e "\twill resize all jpg images in the folder to 900px wide and mantain the"
 125         echo -e "\taspect ratio of the original images"
 126         echo
 127         echo -e "$(basename $0) --gif 8 jpg france"
 128         echo -e "\twill create a looping gif named france.gif using all the jpg files found"
 129         echo -e "\tin the current folder and passing a tick delay of 8 between frames".
 130         echo
 131         ;;
 132 esac
 133 }
 134
 135 # showerror
 136 showerror ()
 137 {
 138     if &#91; -z $1 ];then
 139         echo "INTERNAL ERROR - ABORTING"; echo
 140         exit $E_INTERROR
 141     fi
 142     case $1 in
 143         unknownopt)
 144             echo "unknown option. Exiting."; echo
 145         ;;
 146         noopts)
 147             echo "you didn't specify any options for the script to run. Exiting."; echo
 148         ;;
 149         noargs)
 150             echo "you didn't specify any arguments for this option. Exiting."; echo
 151         ;;
 152         filexists)
 153             echo "the file you want to write already exists. Exiting."; echo
 154         ;;
 155         noimages)
 156             echo "at least two files must exist within $PWD with the"
 157             echo "specified extension. Exiting"; echo
 158         ;;
 159         missingdeps)
 160             echo "$(basename $0) requires both mogrify and convert from"
 161             echo "the imagemagik tool suite. Install imagemagik using your"
 162             echo "favourite package manager and then run this script again. Exiting."; echo
 163     esac
 164 }
 165
 166 ##### MAIN #####
 167 if &#91; $# -eq 0 ];then
 168     showerror noopts
 169     showhelp
 170     exit $E_NOOPTS
 171 else
 172
 173     while &#91; $# -gt 0 ];do
 174         case $1 in
 175             -h|--help)
 176                 showhelp
 177                 exit $SHOWHELP
 178             ;;
 179             -r|--resize)
 180                 WIDTH=$2
 181                 EXT=$3
 182                 shift
 183                 if &#91;&#91; -z $WIDTH || -z $EXT ]];then
 184                     showhelp resize
 185                     showerror noargs
 186                     exit $E_NOARGS
 187                 fi
 188                 IMAGES="$(ls -1 *.$EXT 2>/dev/null | wc -l)"
 189                 if &#91;&#91; $IMAGES == 0 ]]; then
 190                     showerror noimages
 191                     exit $E_NOIMAGES
 192                 fi
 193                 clear
 194                 COUNT="$(ls -1 *.$EXT 2>/dev/null | wc -l)"
 195                 echo "you're going to resize all $COUNT .$EXT images inside $PWD at a fixed width of ${WIDTH}px"
 196                 read -p "do you wish to continue? &#91;y/n] " -n 1 -r; echo
 197                 if &#91;&#91; ! $REPLY =~ ^&#91;Yy]$ ]]
 198                 then
 199                     exit $USERABORTED
 200                 else
 201                 $MOGRIFY -resize $WIDTH *.$EXT
 202                 exit 0
 203                 fi
 204             ;;
 205             -g|--gif)
 206                 DELAY=$2
 207                 EXT=$3
 208                 OUTPUT=$4
 209                 shift
 210                 if &#91;&#91; -z $DELAY || -z $EXT || -z $OUTPUT ]];then
 211                     showhelp gif
 212                     showerror noargs
 213                     exit $E_NOARGS
 214                 elif &#91;&#91; -f ${OUTPUT}.gif ]]; then
 215                     showerror filexists
 216                     exit $E_FILEXISTS
 217                 fi
 218                 IMAGES="$(ls -1 *.$EXT 2>/dev/null | wc -l)"
 219                 if &#91;&#91; $IMAGES == 0 ]]; then
 220                     showerror noimages
 221                     exit $E_NOIMAGES
 222                 fi
 223                 clear
 224                 COUNT="$(ls -1 *.$EXT 2>/dev/null | wc -l)"
 225                 echo "you're going to create a looping gif named ${OUTPUT}.gif"
 226                 echo "out of all the $COUNT $EXT files inside $PWD with a tick"
 227                 echo "delay of $DELAY/100 of a second"; echo
 228                 read -p "do you wish to continue? &#91;y/n] " -n 1 -r; echo
 229                 if &#91;&#91; ! $REPLY =~ ^&#91;Yy]$ ]]
 230                 then
 231                     exit $USERABORTED
 232                 else
 233                     $CONVERT -delay $DELAY *.$EXT -loop 0 ${OUTPUT}.gif
 234                     exit 0
 235                 fi
 236             ;;
 237             *)
 238                 showerror unknownopt
 239                 showhelp
 240                 exit $E_UNKNOWNOPT
 241         esac
 242         shift
 243     done
 244 fi</code></pre>