Refactoring install plugin script (#427)

* Refactor: Improve functionality and efficiency of installation script

* Refactor: Improve functionality and efficiency of installation script

* fixed the spacing error and also added the helm debug logic

scripts/install_plugin.sh

@@ -1,53 +1,90 @@
-#!/bin/sh -e
-
-# Copied w/ love from the chartmuseum/helm-push :)
+#!/bin/sh
+set -e
 
 [ ! -z "$HELM_DEBUG" ] && set -x
 
+
+# Function to print error message and exit
+error_exit() {
+    echo "$1" >&2
+    exit 1
+}
+
+# Function to validate command availability
+validate_command() {
+    command -v "$1" >/dev/null 2>&1 || error_exit "Required command '$1' not found. Please install it."
+}
+
+# Function to detect the latest version from GitHub API
+get_latest_version() {
+    local latest_version
+    latest_version="$(curl -s "${api_repo}" | grep -oE '"name": "v[^"]+' | cut -d 'v' -f 2)"
+    echo "$latest_version"
+}
+
+# Function to download and install the plugin
+install_plugin() {
+    local plugin_version="$1"
+    local plugin_url="$2"
+    local plugin_filename="$3"
+    local plugin_directory="$4"
+
+    # Download the plugin archive
+    if validate_command "curl"; then
+        curl --fail -sSL "${plugin_url}" -o "${plugin_filename}"
+    elif validate_command "wget"; then
+        wget -q "${plugin_url}" -O "${plugin_filename}"
+    else
+        error_exit "Both 'curl' and 'wget' commands not found. Please install either one."
+    fi
+
+    # Extract and install the plugin
+    tar xzf "${plugin_filename}" -C "${plugin_directory}"
+    mv "${plugin_directory}/${name}" "bin/${name}" || mv "${plugin_directory}/${name}.exe" "bin/${name}"
+}
+
+# Main script
 name="helm-dashboard"
 repo="https://github.com/komodorio/${name}"
 api_repo="https://api.github.com/repos/komodorio/${name}/releases/latest"
+HELM_PUSH_PLUGIN_NO_INSTALL_HOOK="${HELM_PUSH_PLUGIN_NO_INSTALL_HOOK:-}"
 
-if [ -n "${HELM_PUSH_PLUGIN_NO_INSTALL_HOOK}" ]; then
+# Check if in development mode
+if [ -n "$HELM_PUSH_PLUGIN_NO_INSTALL_HOOK" ]; then
     echo "Development mode: not downloading versioned release."
     exit 0
 fi
 
-version="$(curl -s ${api_repo} | grep '\"name\": "v.*\"' | cut -d 'v' -f 2 | cut -d '"' -f 1)"
-echo Tried to autodetect latest version: $version
+# Autodetect the latest version
+version=$(get_latest_version)
+echo "Tried to autodetect latest version: $version"
 [ -z "$version" ] && {
-  version="$(cat plugin.yaml | grep "version" | cut -d '"' -f 2)"
-  echo Defaulted to version: $version
+    version="$(awk -F '"' '/version/ {print $2}' plugin.yaml)"
+    echo "Defaulted to version: $version"
 }
+
 echo "Downloading and installing ${name} v${version} ..."
 
-url=""
-
-# convert architecture of the target system to a compatible GOARCH value.
-# Otherwise failes to download of the plugin from github, because the provided
-# architecture by `uname -m` is not part of the github release.
-arch=""
+# Convert architecture of the target system to a compatible GOARCH value
 case $(uname -m) in
-  x86_64)
-    arch="x86_64"
-    ;;
-  armv6*)
-    arch="armv6"
-    ;;
-  # match every arm processor version like armv7h, armv7l and so on.
-  armv7*)
-    arch="armv7"
-    ;;
-  aarch64 | arm64)
-    arch="arm64"
-    ;;
-  *)
-    echo "Failed to detect target architecture"
-    exit 1
-    ;;
+    x86_64)
+        arch="x86_64"
+        ;;
+    armv6*)
+        arch="armv6"
+        ;;
+    armv7*)
+        arch="armv7"
+        ;;
+    aarch64 | arm64)
+        arch="arm64"
+        ;;
+    *)
+        error_exit "Failed to detect target architecture"
+        ;;
 esac
 
-
+# Construct the plugin download URL
 if [ "$(uname)" = "Darwin" ]; then
     url="${repo}/releases/download/v${version}/${name}_${version}_Darwin_${arch}.tar.gz"
 elif [ "$(uname)" = "Linux" ] ; then
@@ -56,22 +93,14 @@ else
     url="${repo}/releases/download/v${version}/${name}_${version}_windows_${arch}.tar.gz"
 fi
 
-echo $url
+echo "$url"
 
 mkdir -p "bin"
 mkdir -p "releases/v${version}"
 
-# Download with curl if possible.
-if [ -x "$(which curl 2>/dev/null)" ]; then
-    curl --fail -sSL "${url}" -o "releases/v${version}.tar.gz"
-else
-    wget -q "${url}" -O "releases/v${version}.tar.gz"
-fi
-tar xzf "releases/v${version}.tar.gz" -C "releases/v${version}"
-mv "releases/v${version}/${name}" "bin/${name}" || \
-    mv "releases/v${version}/${name}.exe" "bin/${name}"
+install_plugin "$version" "$url" "releases/v${version}.tar.gz" "releases/v${version}"
 
 echo
-echo "Helm Dashboard is installed, to start it, run in your terminal:"
-echo "    helm dashboard"
-echo
+echo "Helm Dashboard is installed. To start it, run the following command:"
+echo "helm dashboard"
+