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 featured_image: /uploads/2016/01/G0092546.jpg
   7 categories:
   8   - code
   9   - diy
  10   - fotografia
  11 tags:
  12   - bash
  13   - convert
  14   - gif
  15   - imagemagik
  16   - mogrify
  17   - script
  18
  19 ---
  20 <div class="wp-block-image size-full wp-image-3645">
  21   <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>
  22 </div>
  23
  24 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.
  25
  26 <div class="wp-block-buttons aligncenter">
  27   <div class="wp-block-button">
  28     <a class="wp-block-button__link" href="" target="_blank" rel="noreferrer noopener">download in zip format</a>
  29   </div>
  30 </div>
  31
  32 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.
  33
  34 <!--more-->
  35
  36 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:
  37
  38 <pre class="wp-block-code language-bash"><code>gify.sh --resize 900 jpg</code></pre>
  39
  40 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.
  41
  42 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:
  43
  44 <pre class="wp-block-code language-bash"><code>gify.sh --gif 10 jpg paris</code></pre>
  45
  46 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.
  47
  48 The gif you see at the beginning of the article was created with this script.
  49
  50 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.
  51
  52 I&#8217;ll leave you with a copy of the script here in case you want to have a look at it before downloading.
  53 Enjoy!
  54
  55 {{< highlight bash "linenos=true" >}}#! /bin/bash
  56
  57 # Author:       Danilo 'danix' Macri
  58 # Author URI:   https://danix.xyz
  59 # Script URI:   https://danix.xyz/?p=3545
  60 # License:      GPL2
  61 # License URI:  https://www.gnu.org/licenses/gpl-2.0.html
  62
  63 #--------------------------------------------------------------------------------#
  64 #                                                                                #
  65 #             GIFY.SH - CREATE ANIMATED GIFS OUT OF A BUNCH OF IMAGES            #
  66 #                                                                                #
  67 # Use this script to create animated looping gifs from a bunch of images. You    #
  68 # just need to arrange all the images you want to use inside a folder and then   #
  69 # launch this script with a few options and you'll have your gif within seconds. #
  70 #                                                                                #
  71 # This script uses mogrify and convert from the IMAGEMAGIK suite to deliver the  #
  72 # gifs. This script can proportionally resize your images to help you create a   #
  73 # lighter file.                                                                  #
  74 #                                                                                #
  75 #--------------------------------------------------------------------------------#
  76
  77 # ERROR & EXIT STATUSES
  78 SHOWHELP=61
  79 USERABORTED=62
  80
  81 E_INTERROR=71
  82 E_NOOPTS=72
  83 E_NOARGS=73
  84 E_FILEXISTS=74
  85 E_NOIMAGES=75
  86 E_UNKNOWNOPT=76
  87
  88 # TOOLS
  89 PWD=$(pwd)
  90 MOGRIFY=$(which mogrify)
  91 CONVERT=$(which convert)
  92
  93 # we need mogrify and convert from the imagemagik toolset for this script to work
  94 if &#91;&#91; ! -x $MOGRIFY || ! -x $CONVERT ]]; then
  95     showerror missingdeps
  96     exit $E_MISSINGDEPS
  97 fi
  98
  99
 100 # showhelp
 101 showhelp ()
 102 {
 103 case $1 in
 104     resize )
 105         echo "USAGE: $(basename $0) -r | --resize &#91;width] &#91;extension]"
 106         ;;
 107     gif )
 108         echo "USAGE: $(basename $0) -g | --gif &#91;delay] &#91;extension] &#91;output file name]"
 109         ;;
 110     * )
 111                 #|----------------------- TEXT MAX WIDTH - 80 CHARS ----------------------------|
 112         echo -e "$(basename $0) - create animated gifs from images inside current directory"
 113         echo -e "USAGE: $(basename $0) &lt;option> &#91;arguments]"
 114         echo -e "\twhere &lt;option> is one between:";echo
 115         echo -e "\t-r | --resize &#91;width] &#91;extension]"
 116         echo -e "\t\tresizes all the images matching the extension in the current folder to"
 117         echo -e "\t\tthe width specified as argument.";echo
 118         echo -e "\tg | --gif &#91;delay] &#91;extension] &#91;output file name]"
 119         echo -e "\t\tcreates the gif file using all the images in the current folder."
 120         echo
 121         echo -e "EXAMPLES:"
 122         echo -e "$(basename $0) --resize 900 jpg"
 123         echo -e "\twill resize all jpg images in the folder to 900px wide and mantain the"
 124         echo -e "\taspect ratio of the original images"
 125         echo
 126         echo -e "$(basename $0) --gif 8 jpg france"
 127         echo -e "\twill create a looping gif named france.gif using all the jpg files found"
 128         echo -e "\tin the current folder and passing a tick delay of 8 between frames".
 129         echo
 130         ;;
 131 esac
 132 }
 133
 134 # showerror
 135 showerror ()
 136 {
 137     if &#91; -z $1 ];then
 138         echo "INTERNAL ERROR - ABORTING"; echo
 139         exit $E_INTERROR
 140     fi
 141     case $1 in
 142         unknownopt)
 143             echo "unknown option. Exiting."; echo
 144         ;;
 145         noopts)
 146             echo "you didn't specify any options for the script to run. Exiting."; echo
 147         ;;
 148         noargs)
 149             echo "you didn't specify any arguments for this option. Exiting."; echo
 150         ;;
 151         filexists)
 152             echo "the file you want to write already exists. Exiting."; echo
 153         ;;
 154         noimages)
 155             echo "at least two files must exist within $PWD with the"
 156             echo "specified extension. Exiting"; echo
 157         ;;
 158         missingdeps)
 159             echo "$(basename $0) requires both mogrify and convert from"
 160             echo "the imagemagik tool suite. Install imagemagik using your"
 161             echo "favourite package manager and then run this script again. Exiting."; echo
 162     esac
 163 }
 164
 165 ##### MAIN #####
 166 if &#91; $# -eq 0 ];then
 167     showerror noopts
 168     showhelp
 169     exit $E_NOOPTS
 170 else
 171
 172     while &#91; $# -gt 0 ];do
 173         case $1 in
 174             -h|--help)
 175                 showhelp
 176                 exit $SHOWHELP
 177             ;;
 178             -r|--resize)
 179                 WIDTH=$2
 180                 EXT=$3
 181                 shift
 182                 if &#91;&#91; -z $WIDTH || -z $EXT ]];then
 183                     showhelp resize
 184                     showerror noargs
 185                     exit $E_NOARGS
 186                 fi
 187                 IMAGES="$(ls -1 *.$EXT 2>/dev/null | wc -l)"
 188                 if &#91;&#91; $IMAGES == 0 ]]; then
 189                     showerror noimages
 190                     exit $E_NOIMAGES
 191                 fi
 192                 clear
 193                 COUNT="$(ls -1 *.$EXT 2>/dev/null | wc -l)"
 194                 echo "you're going to resize all $COUNT .$EXT images inside $PWD at a fixed width of ${WIDTH}px"
 195                 read -p "do you wish to continue? &#91;y/n] " -n 1 -r; echo
 196                 if &#91;&#91; ! $REPLY =~ ^&#91;Yy]$ ]]
 197                 then
 198                     exit $USERABORTED
 199                 else
 200                 $MOGRIFY -resize $WIDTH *.$EXT
 201                 exit 0
 202                 fi
 203             ;;
 204             -g|--gif)
 205                 DELAY=$2
 206                 EXT=$3
 207                 OUTPUT=$4
 208                 shift
 209                 if &#91;&#91; -z $DELAY || -z $EXT || -z $OUTPUT ]];then
 210                     showhelp gif
 211                     showerror noargs
 212                     exit $E_NOARGS
 213                 elif &#91;&#91; -f ${OUTPUT}.gif ]]; then
 214                     showerror filexists
 215                     exit $E_FILEXISTS
 216                 fi
 217                 IMAGES="$(ls -1 *.$EXT 2>/dev/null | wc -l)"
 218                 if &#91;&#91; $IMAGES == 0 ]]; then
 219                     showerror noimages
 220                     exit $E_NOIMAGES
 221                 fi
 222                 clear
 223                 COUNT="$(ls -1 *.$EXT 2>/dev/null | wc -l)"
 224                 echo "you're going to create a looping gif named ${OUTPUT}.gif"
 225                 echo "out of all the $COUNT $EXT files inside $PWD with a tick"
 226                 echo "delay of $DELAY/100 of a second"; echo
 227                 read -p "do you wish to continue? &#91;y/n] " -n 1 -r; echo
 228                 if &#91;&#91; ! $REPLY =~ ^&#91;Yy]$ ]]
 229                 then
 230                     exit $USERABORTED
 231                 else
 232                     $CONVERT -delay $DELAY *.$EXT -loop 0 ${OUTPUT}.gif
 233                     exit 0
 234                 fi
 235             ;;
 236             *)
 237                 showerror unknownopt
 238                 showhelp
 239                 exit $E_UNKNOWNOPT
 240         esac
 241         shift
 242     done
 243 fi
 244
 245 {{< /highlight >}}