add --reverse option to animoji-command

.config/zsh/completions/_animoji-command

@@ -4,6 +4,7 @@ _arguments '-h[short help text]' \
            '--help[short help text]' \
            '--delay[milliseconds to show each frame]:milliseconds' \
            '--blend[enable blending (only WebP)]' \
+           '--reverse[append all images again, in reverse]' \
            '*:input files:_files'
 
 # Local Variables:

.config/zsh/functions/animoji-command

@@ -7,18 +7,21 @@ zmodload zsh/zutil
 local -a o_help=()
 local -a o_delay=()
 local -a o_blend=()
-zparseopts -D -K -- h=o_help -help=o_help -delay:=o_delay -blend=o_blend
+local -a o_reverse=()
+zparseopts -D -K -- h=o_help -help=o_help \
+    -delay:=o_delay -blend=o_blend -reverse=o_reverse
 if [[ ${#o_help} -ne 0 || ! -v 1 ]]; then
     local ret=$(( ${#o_help} ^ 1 ))
     print -u $(( 1 + ${ret} )) \
-          "usage: ${0} [-h|--help] [--delay MILLISECONDS] [--blend]" "<FILES>"
+        "usage: ${0} [-h|--help] [--delay MILLISECONDS] [--blend] [--reverse]" \
+        "<FILES>"
     return ${ret}
 fi
 
 local delay=100
 [[ ${#o_delay} -eq 2 ]] && delay=${o_delay[2]}
 local blend="-b"
-[[ ${#o_help} -ne 0 ]] && blend="+b"
+[[ ${#o_blend} -ne 0 ]] && blend="+b"
 
 local -a cmd
 if [[ ${1##*.} == "webp" ]]; then
@@ -26,11 +29,25 @@ if [[ ${1##*.} == "webp" ]]; then
     for file in ${@}; do
         cmd+=(-frame ${file} +${delay}+0+0+0${blend})
     done
+    if [[ ${#o_reverse} -ne 0 ]]; then
+        cmd[-1]=+$((${delay} * 2))+0+0+0${blend}
+        cmd[6]=+$((${delay} * 2))+0+0+0${blend}
+        for file in ${(Oa)@:2:-1}; do
+            cmd+=(-frame ${file} +${delay}+0+0+0${blend})
+        done
+    fi
 elif [[ ${1##*.} == "png" ]]; then
     cmd=(apngasm --output output.png)
     for file in ${@}; do
         cmd+=(${file} ${delay})
     done
+    if [[ ${#o_reverse} -ne 0 ]]; then
+        cmd[-1]=$((${delay} * 2))
+        cmd[5]=$((${delay} * 2))
+        for file in ${(Oa)@:2:-1}; do
+            cmd+=(${file} ${delay})
+        done
+    fi
 else
     print -u 2 "file format not supported"
     return 1