Add arguments for adjustable parameters and update README with usage examples.

Author: NathanJPlummer

README.md

@@ -11,33 +11,45 @@ By design, Guetzling will overwrite and/or delete your original files.  If you w
 ## Usage
 1. Simply `cd` to the parent directory of your choice, and `guetzling`. ***Voilà!***
 
-## Adjustable Options
-
-By opening the script in a text editor, you can adjust certain variables to change the output of Guetzling.
-
-### JPG
-
-Enable/Disable re-compression of JPG and JPEG files using Guetzling.
-
-	#Recompress JPG Images
-	#Set to false to disable
-	JPG=true
-
-### PNG
-
-Enable/Disable the conversion of PNG to JPG using Guetzling.
-
-	#Convert PNG Images
-	#Set to false to disable
-	#PNGS WILL BE DELETED AFTER CONVERSION
-	PNG=true
-
-### QUALITY
-
-Change Guetzling/Guetzli Quality Level.
-
-	#Set Quality level
-	#Default = 95
-	#Max = 100
-	#Min = 84
-	QUALITY=95
+## Adjustable Parameters
+
+By Default, Guetzling uses the following options:
+ 
+- JPGs are re-compressed and overwritten
+- PNGs are converted to JPG and the originals are deleted
+- Quality Level is for Guetzli is set to 95
+
+You can adjust these options using bash arguments:
+
+1. Quality for JPG re-compression.
+	- Requires a value between 84 and 100 for Guetzli is designed to fail
+	- Default value is the same as Guetzli: 95
+ 
+ 2. Quality for PNG conversion.
+	- Requires a value between 84 and 100 for Guetzli is designed to fail
+	- Default value is the same as Guetzli: 95
+	
+3.  Compress JPGs
+	- Set to "false" and Guetzliing will ignore JPG/JPEG files, compressing only PNGS.
+	
+4. Compress PNGs
+	- Set to "false" and Guetzling will ignore PNG files, compressing only JPGS
+ 
+ 5.  Delete PNG
+ 	- Set to "false" and Guetzling will keep the copy of any original PNGs in your folder
+ 
+
+## Example Usage
+ 
+ Replace all files at quality 95:
+ 
+ 	./guetzling
+ 	
+ Convert JPGs at 95, PNGs at 84, and keep your original PNG files:
+ 
+ 	./guetzling 95 84 true true false
+ 	
+ Convert only JPGs at Quality Level 97:
+
+	./guetzling 97 95 true false
+  	 

guetzling

@@ -1,19 +1,28 @@
 #!/bin/bash
 
+#Set Quality level for JPG recompression
+#Default = 95
+#Max = 100
+#Min = 84
+QUALITY_JPG=${1:-95}
+
+#Set Quality level
+#Default = 95
+#Max = 100
+#Min = 84
+QUALITY_PNG=${2:-95}
+
 #Recompress JPG Images
 #Set to false to disable
-JPG=true
+JPG=${3:-true}
 
 #Convert PNG Images
 #Set to false to disable
-#PNGS WILL BE DELETED AFTER CONVERSION
-PNG=true
+#PNGS WILL BE DELETED AFTER CONVERSION UNLESS OTHERWISE SPECIFIED
+PNG=${4:-true}
 
-#Set Quality level
-#Default = 95
-#Max = 100
-#Min = 84
-QUALITY=95
+#Remove original PNGS after conversion to JPG
+PNG_DELETE=${5:-true}
 
 IFS=$'\n';
 FOLDER=$(pwd)
@@ -23,8 +32,8 @@ if [ $JPG = true ];
         for f in $(find "$FOLDER" -name '*.jpg')
         #for f in $1/*.jpg
         do
-	        echo "Guetzling file - $f..."
-	        guetzli --quality "$QUALITY" "$f" "$f"
+	        echo "Guetzling file - $f at level '$QUALITY_JPG'..."
+	        guetzli --quality "$QUALITY_JPG" "$f" "$f"
 	        echo "Done."
         done
 fi
@@ -34,9 +43,9 @@ if [ $JPG = true ];
         for f in $(find "$FOLDER" -name '*.jpeg')
         #for f in $1/*.jpeg
         do
-	        echo "Guetzling file - $f..."
-	        guetzli --quality "$QUALITY" "$f" "$f"
-	        echo "Done."
+            echo "Guetzling file - $f at level '$QUALITY_JPG'..."
+            guetzli --quality "$QUALITY_JPG" "$f" "$f"
+            echo "Done."
         done
 fi
 
@@ -45,9 +54,14 @@ if [ $PNG = true ];
         for f in $(find "$FOLDER" -name '*.png')
         #for f in $1/*.png
         do
-	        echo "Guetzling file - $f..."
-	        guetzli --quality "$QUALITY" "$f" "${f%.png}.jpg"
-    rm "$f"
-	        echo "Done."
+	        echo "Guetzling file - $f at level '$QUALITY_PNG' ..."
+	        guetzli --quality "$QUALITY_PNG" "$f" "${f%.png}.jpg"
+            
+            if [ $PNG_DELETE = true ];
+                then
+                    rm "$f"
+            fi
+	        
+            echo "Done."
         done
 fi