add dockertags() function

README.md

@@ -46,13 +46,14 @@ in your .zshrc. This requires antigen installed.
 
 0. `cheat`, show cheat sheet for commands using cheat.sh (`cheat commandname`)
 1. Quickly edit/reload profile (`esource`/`resource`)
-2. `ramdisk` (only on OSX) create a RAM disk. Default size: 1GB  
+2. `dockertags` list all tags for a given docker image
+3. `ramdisk` (only on OSX) create a RAM disk. Default size: 1GB  
     `    ramdisk 4`
 creates a 4GB RAM disk
-3. `color` to print colored text (see 3. in the Misc section):  
+4. `color` to print colored text (see 3. in the Misc section):  
     color $Red "This will be printed in red"
     color $Yellow "This will be printed in red"
-4. `mecp` to copy files back to the machine from wich you are ssh-ing.
+5. `mecp` to copy files back to the machine from wich you are ssh-ing.
    For this to work an ssh tunnel with Remoteforward is needed: 
         ssh -R 22:localhost:2222 YOURHOSTNAMEHERE
    or specify this in ~/.ssh/config:

functions.sh

@@ -17,6 +17,21 @@ function cheatall
 {
     curl "https://cheat.sh/~$1"
 }
+
+# List all docker tags for an image
+function dockertags
+{
+    if [[ -z `which jq` ]]; then
+        echo "jq not installed. Please install jq." 1>&2
+        return
+    fi
+    i=0
+    while [[ $? == 0 ]]; do
+       i=$(($i+1))
+       curl "https://registry.hub.docker.com/v2/repositories/library/$1/tags/?page=$i" 2>/dev/null | jq '."results"[]["name"]'
+    done
+}
+
 ## Simple calculator. Usage: calc 1+1, calc 5/7, calc "sqrt(2)"
 function calc
 {