Add zip compression method (fix #2)

Dockerfile

@@ -8,7 +8,7 @@ LABEL "com.github.actions.color"="black"
 ENV GHR_FORK tcnksm/ghr
 ENV GHR_VERSION 0.12.0
 
-RUN apk add --no-cache bash curl xz
+RUN apk add --no-cache bash curl xz zip
 
 RUN sh -c "curl --silent -L https://github.com/${GHR_FORK}/releases/download/v${GHR_VERSION}/ghr_v${GHR_VERSION}_linux_amd64.tar.gz > ghr_v${GHR_VERSION}_linux_amd64.tar.gz" && \
     sh -c "tar xvzf ghr_v${GHR_VERSION}_linux_amd64.tar.gz" && \

README.md

@@ -16,8 +16,8 @@ The action will trigger on pushes to tags and exit neutrally otherwise.
 
 - `GHR_COMPRESS` — **Optional.**
   Compress files before uploading them.
-  Can be either `gz`, `bz2` or `xz`.
-  The correct file extension will be appended (e.g. `.tar.gz`).
+  Can be either `gz`, `bz2`, `xz`, or `zip`.
+  The correct file extension will be appended (e.g. `.tar.gz`, or `.zip`).
 
 ## Usage example
 

ghr-compress

@@ -1,24 +1,41 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e -u -o pipefail
 shopt -s nullglob
 
-extension="$GHR_COMPRESS"
-
-if [ "$extension" = "gz" ]; then
-    option=z
-elif [ "$extension" = "bz2" ]; then
-    option=j
-elif [ "$extension" = "xz" ]; then
-    option=J
+if [ "$GHR_COMPRESS" = "gz" ]; then
+    tar_option=z
+    extension=".tar.gz"
+elif [ "$GHR_COMPRESS" = "bz2" ]; then
+    tar_option=j
+    extension=".tar.bz2"
+elif [ "$GHR_COMPRESS" = "xz" ]; then
+    tar_option=J
+    extension=".tar.xz"
+elif [ "$GHR_COMPRESS" = "zip" ]; then
+    extension=".zip"
 else
     echo "ghr-compress: error: unknown extension: ${extension}" >&2
     exit 1
 fi
 
+ghr-compress-one-tar() {
+    local file="$1"
+    tar c "-${tar_option}" -f "${file}${extension}" "$file"
+}
+
+ghr-compress-one-zip() {
+    local file="$1"
+    zip -r "${file}${extension}" "$file"
+}
+
 ghr-compress-one() {
     local file="$1"
-    /bin/tar c "-${option}" -f "${file}.tar.${extension}" "$file"
-    /bin/rm -r -- "$file"
+    if [ "$GHR_COMPRESS" = "zip" ]; then
+        ghr-compress-one-zip "$file" >&2
+    else
+        ghr-compress-one-tar "$file"
+    fi
+    rm -r -- "$file"
 }
 
 if [ "$GHR_PATH" = "." ]; then
@@ -27,5 +44,5 @@ if [ "$GHR_PATH" = "." ]; then
     done
 else
     ghr-compress-one "$GHR_PATH"
-    echo "export GHR_PATH=$(printf '%q' "${GHR_PATH}.tar.${extension}")"
+    echo "export GHR_PATH=$(printf '%q' "${GHR_PATH}${extension}")"
 fi