3 files changed, 47 insertions, 19 deletions
diff --git a/modules/blog/blog.js b/modules/blog/blog.js
index a866003..3985fdb 100644
--- a/modules/blog/blog.js
+++ b/modules/blog/blog.js
@@ -4,6 +4,7 @@ const https = require("https");
 const child_process = require("child_process");
 
 const generateTemplate = require("./template.js");
+const blogUtil = require("./util.js");
 
 let moddir = null;
 let repodir = null;
@@ -50,32 +51,17 @@ function fetch(url) {
 	});
 }
 
-function runCommand(cmd, args) {
-	console.log(`blog: ${cmd} ${JSON.stringify(args)}`);
-	child_process.execFileSync(
-		cmd, args,
-		{ stdio: "inherit", timeout: 20000 }
-	);
-}
-
-function runCommandOutput(cmd, args) {
-	return child_process.execFileSync(
-		cmd, args,
-		{ timeout: 20000 }
-	);
-}
-
 function ensureRepo() {
 	try {
 		const stats = fs.statSync(repodir);
 		if (stats.isDirectory()) return;
 	} catch (e) {}
 
-	runCommand("git", ["clone", "https://git.tomsmeding.com/blog", repodir]);
+	blogUtil.runCommand("git", ["clone", "https://git.tomsmeding.com/blog", repodir]);
 }
 
 function currentCommit() {
-	return runCommandOutput("git", ["-C", repodir, "rev-parse", "HEAD"]).toString().trim();
+	return blogUtil.runCommandOutput("git", ["-C", repodir, "rev-parse", "HEAD"], { silent: true }).toString().trim();
 }
 
 async function upstreamCommit() {
@@ -85,8 +71,8 @@ async function upstreamCommit() {
 
 function updateRepo() {
 	try {
-		runCommand("git", ["-C", repodir, "fetch", "--all"]);
-		runCommand("git", ["-C", repodir, "reset", "origin/master", "--hard"]);
+		blogUtil.runCommand("git", ["-C", repodir, "fetch", "--all"]);
+		blogUtil.runCommand("git", ["-C", repodir, "reset", "origin/master", "--hard"]);
 		// Reset cache _after_ the commands succeeded; if anything failed, we
 		// might at least still have stale cache data
 		templateCache = new Map();
diff --git a/modules/blog/template.js b/modules/blog/template.js
index 32d7bb3..a1d4d3d 100644
--- a/modules/blog/template.js
+++ b/modules/blog/template.js
@@ -1,5 +1,7 @@
 const fs = require("fs").promises;
 
+const blogUtil = require("./util.js");
+
 const pathRoot = "blog";
 
 async function recursiveTree(dir) {
@@ -39,6 +41,21 @@ function generateTree(tree, path) {
 	return out;
 }
 
+// path: file path inside repo
+async function generateDatetime(repodir, path) {
+	if (path == "index.html") return "";
+
+	const stat = await fs.stat(repodir + "/" + path);
+	const gitout = await blogUtil.runCommandOutput("git", ["-C", repodir, "log", "--format=format:%as", "--", path]);
+	const lines = gitout.toString().trim().split("\n");
+	const last = lines[0];
+	const first = lines[lines.length - 1];
+	if (last == first)
+		return `Last updated: <time datetime="${last}">${last}</time>`;
+	else
+		return `Created: <time datetime="${first}">${first}</time>, last updated: <time datetime="${last}">${last}</time>`;
+}
+
 async function template(repodir, contentPath) {
 	const tree = await recursiveTree(repodir);
 	tree.delete("$template");
@@ -50,6 +67,7 @@ async function template(repodir, contentPath) {
 
 	html = html.replace("<!-- REPLACE TREE -->", generateTree(tree, pathRoot));
 	html = html.replace("<!-- REPLACE CONTENT -->", content);
+	html = html.replace("<!-- REPLACE DATETIME -->", await generateDatetime(repodir, contentPath))
 
 	return html;
 }
diff --git a/modules/blog/util.js b/modules/blog/util.js
new file mode 100644
index 0000000..933ff30
--- /dev/null
+++ b/modules/blog/util.js
@@ -0,0 +1,24 @@
+const child_process = require("child_process");
+
+
+function runCommand(cmd, args) {
+	console.log(`blog: ${cmd} ${JSON.stringify(args)}`);
+	child_process.execFileSync(
+		cmd, args,
+		{ stdio: "inherit", timeout: 20000 }
+	);
+}
+
+function runCommandOutput(cmd, args, opts) {
+    if (opts == null) opts = {};
+	if (!opts.silent) console.log(`blog: ${cmd} ${JSON.stringify(args)}`);
+	return child_process.execFileSync(
+		cmd, args,
+		{ timeout: 20000 }
+	);
+}
+
+module.exports = {
+    runCommand,
+    runCommandOutput,
+};