androidStudioPackages: add update script

pkgs/applications/editors/android-studio/update.sh

@@ -0,0 +1,70 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -I nixpkgs=./. -i bash -p python3Packages.yq nix-prefetch-scripts
+
+set -euo pipefail
+
+DEFAULT_NIX="$(realpath "./pkgs/applications/editors/android-studio/default.nix")"
+RELEASES_XML="$(curl -v --silent https://raw.githubusercontent.com/JetBrains/intellij-sdk-docs/main/topics/_generated/android_studio_releases.xml 2>/dev/null)"
+
+# Available channels: Release/Patch (stable), Beta, Canary
+getLatest() {
+    local attribute="$1"
+    local channel="$2"
+    [[ "$channel" = "stable" ]] && channel="release" # Our naming convention is different
+    local result="$(echo "$RELEASES_XML" \
+        | xq -r ".[].item[] | select(.channel == \"${channel^}\") | .${attribute}" \
+        | sort --version-sort \
+        | tail -n 1)"
+
+    if [[ -n "$result" ]]; then
+        echo "$result"
+    else
+        echo "could not find the latest $attribute for $channel"
+        exit 1
+    fi
+}
+
+updateChannel() {
+    local channel="$1"
+    local latestVersion="$(getLatest "version" "$channel")"
+    if [[ "$channel" = "stable" ]]; then
+        # Sometimes the latest stable version is published under the `patch` channel instead of `release`,
+        # so we need to check if the latest version of the release channel isnt older than the patch channel
+        local latestPatchVersion="$(getLatest "version" "patch")"
+        if [[ "$(nix eval --expr "with import ./default.nix {}; lib.versionOlder \"${latestVersion}\" \"${latestPatchVersion}\"" --impure)" = "true" ]]; then
+            latestVersion="$latestPatchVersion"
+        fi
+    fi
+
+    local localVersion="$(nix eval --raw --file . androidStudioPackages."${channel}".version)"
+    if [[ "${latestVersion}" == "${localVersion}" ]]; then
+        echo "$channel is already up to date!"
+        return 0
+    fi
+    echo "updating $channel from $localVersion to $latestVersion"
+
+    local latestHash="$(nix-prefetch-url --quiet "https://dl.google.com/dl/android/studio/ide-zips/${latestVersion}/android-studio-${latestVersion}-linux.tar.gz")"
+    local localHash="$(nix eval --raw --file . androidStudioPackages."${channel}".unwrapped.src.drvAttrs.outputHash)"
+    sed -i "s/${localHash}/${latestHash}/g" "${DEFAULT_NIX}"
+
+    # Match the formatting of default.nix: `version = "2021.3.1.14"; # "Android Studio Dolphin (2021.3.1) Beta 5"`
+    local versionString="${latestVersion}\"; # \"$(getLatest "name" "${channel}")\""
+    sed -i "s/${localVersion}.*/${versionString}/g" "${DEFAULT_NIX}"
+    echo "updated ${channel} to ${latestVersion}"
+}
+
+if (( $# == 0 )); then
+    for channel in "beta" "canary" "stable"; do
+        updateChannel "$channel"
+    done
+else
+    while (( "$#" )); do
+        case "$1" in
+            beta|canary|stable)
+                updateChannel "$1" ;;
+            *)
+                echo "unknown channel: $1" && exit 1 ;;
+        esac
+        shift 1
+    done
+fi