feat(update): add results of nix-update executions

apps/update-sources/src/app.ts

@@ -92,7 +92,19 @@ const main = async() => {
             'scopedPackages.x86_64-linux.lovelace-components.custom-sidebar',
         ));
         console.log(updateCustomPackage('some-sass-language-server'));
-        console.log(runNixUpdate('homepage'));
+
+        // nix-update executions
+        let nixUpdateOutputs = '';
+
+        const updatePackage = (pkg: string): void => {
+            const execution = runNixUpdate(pkg);
+
+            nixUpdateOutputs += execution.stdout;
+            console.log(execution.stderr);
+            console.log(execution.stdout);
+        };
+
+        updatePackage('homepage');
 
 
         spawnSync('nixFastBuild', [], {
@@ -121,7 +133,10 @@ const main = async() => {
             output.push(`Node modules:\n${indentOutput(nodeModulesOutput)}\n`);
         }
         if (vuetorrentOutput.length > 5) {
-            output.push(`Misc Sources:\n${indentOutput(vuetorrentOutput)}\n`);
+            output.push(`Misc Sources:\n${indentOutput(vuetorrentOutput)}\n\n`);
+        }
+        if (nixUpdateOutputs.length > 5) {
+            output.push(`nix-update executions:\n${indentOutput(nixUpdateOutputs)}\n`);
         }
 
         if (args['f']) {

apps/update-sources/src/misc.ts

@@ -40,14 +40,34 @@ export const updateVuetorrent = () => {
     return OLD_VERSION !== VERSION ? `Vuetorrent: ${OLD_VERSION} -> ${VERSION}` : '';
 };
 
+
 export const updateCustomPackage = (pkg: string) => spawnSync(
     `nix run ${FLAKE}#${pkg}.update`,
     [],
     { shell: true },
 ).stderr.toString();
 
-export const runNixUpdate = (attr: string, options: string[] = []) => spawnSync(
-    'nix-update',
-    ['--flake', attr, ...options],
+
+const getAttrVersion = (attr: string): string => spawnSync('nix',
+    ['eval', '--raw', `${FLAKE}#${attr}.version`],
+    { shell: true }).stdout.toString();
+
+export const runNixUpdate = (
+    attr: string,
+    options: string[] = [],
+): { stdout: string, stderr: string } => {
+    const OLD_VERSION = getAttrVersion(attr);
+
+    const execution = spawnSync(
+        `nix-update --flake ${attr} --write-commit-message >(head -n 1 -) > /dev/null`,
+        options,
         { shell: true, cwd: FLAKE },
-).stderr.toString();
+    );
+
+    const NEW_VERSION = getAttrVersion(attr);
+
+    return {
+        stdout: OLD_VERSION !== NEW_VERSION ? execution.stdout.toString() : '',
+        stderr: execution.stderr.toString(),
+    };
+};