better error handling for rm and curl (#104)

Co-authored-by: Josh Moore <josh.moore@jmoore.dev>

flameshot_example.sh

@@ -5,16 +5,23 @@ KEY="" # Your ass upload token
 DOMAIN="" # Your upload domain (without http:// or https://)
 
 flameshot config -f "$IMAGENAME" # Make sure that Flameshot names the file correctly
-flameshot gui -r -p "$IMAGEPATH" # Prompt the screenshot GUI
+flameshot gui -r -p "$IMAGEPATH" > /dev/null # Prompt the screenshot GUI, also append the random gibberish to /dev/null
 
-# Upload the image and copy the response URL
+FILE="$IMAGEPATH$IMAGENAME.png" # File path and file name combined
-URL=$(curl -X POST \
-  -H "Content-Type: multipart/form-data" \
-  -H "Accept: application/json" \
-  -H "User-Agent: ShareX/13.4.0" \
-  -H "Authorization: $KEY" \
-  -F "file=@$IMAGEPATH$IMAGENAME.png" "https://$DOMAIN/" | grep -Po '(?<="resource":")[^"]+')
-# printf instead of echo as echo appends a newline
-printf "%s" "$URL" | xclip -sel clip
 
-rm "$IMAGEPATH$IMAGENAME.png" # Delete the image locally
+# Check if file exists to handle Curl and rm errors
+# then upload the image and copy the response URL
+if [ -f "$FILE" ]; then
+    echo "$FILE exists."
+    URL=$(curl -X POST \
+      -H "Content-Type: multipart/form-data" \
+      -H "Accept: application/json" \
+      -H "User-Agent: ShareX/13.4.0" \
+      -H "Authorization: $KEY" \
+      -F "file=@$IMAGEPATH$IMAGENAME.png" "https://$DOMAIN/" | grep -Po '(?<="resource":")[^"]+')
+    # printf instead of echo as echo appends a newline
+    printf "%s" "$URL" | xclip -sel clip
+    rm "$IMAGEPATH$IMAGENAME.png" # Delete the image locally
+else 
+    echo "Aborted."
+fi