Generate preview instances of the site on pull requests

Author: offbyone

justfile

@@ -38,10 +38,21 @@ build settings="pelicanconf.py": prepare_fonts
   uv run pelican --fatal=errors -s {{settings}} -o output content
 
 debug settings="pelicanconf.py": prepare_fonts
-  uv run pelican --fatal=errors -s {{settings}} -o output content --debug
+  uv run pelican --fatal=errors -s {{settings}} -o output content --debug --log-handler=plain
 
 generate: (build "publishconf.py")
 
+generate-debug: (debug "publishconf.py")
+
+generate-for-preview: install-deps prepare_fonts
+    #!/bin/bash
+    set -e
+    uv run pelican --fatal=errors\
+        -s publishconf.py \
+        -o output content \
+        --debug --log-handler=plain \
+        -e PHOTO_RESIZE_JOBS=1 "SITEURL=\"$DEPLOY_PRIME_URL\""
+
 generate-dev: build
 
 publish: generate upload invalidate

netlify.toml

@@ -0,0 +1,19 @@
+[build]
+command = "just install-deps generate"
+publish = "output"
+# don't deploy on pushes to main
+ignore = "exit 0"
+
+[build.environment]
+NODE_VERSION = "22"
+
+[[plugins]]
+package = "./plugins/netlify-plugin-install-tools"
+
+[context.deploy-preview]
+command = "just generate-for-preview"
+ignore = "exit 1"
+
+[context.deploy-preview.environment]
+SITEURL = "$DEPLOY_PRIME_URL"
+NODE_VERSION = "22"

plugins/netlify-plugin-install-tools/index.js

@@ -0,0 +1,52 @@
+module.exports = {
+    onPreBuild: async ({ utils }) => {
+        const { run, build } = utils;
+
+        console.log("=== Installing build tools (mise, just, uv) ===");
+
+        try {
+            // Check if mise is already installed (cached)
+            const miseExists = await run.command(
+                'command -v mise || echo "not-found"',
+                {
+                    reject: false,
+                },
+            );
+
+            if (miseExists.stdout.includes("not-found")) {
+                console.log("Installing mise...");
+                await run.command("curl https://mise.run | sh");
+
+                // Add mise to PATH for subsequent commands
+                process.env.PATH = `${process.env.HOME}/.local/bin:${process.env.PATH}`;
+            } else {
+                console.log("mise already installed (cached)");
+            }
+
+            // Trust the mise configuration in this repo
+            await run.command("mise trust");
+
+            // Install tools from mise.toml
+            console.log("Installing tools from mise.toml...");
+            await run.command("mise install");
+
+            // Install just and uv explicitly (latest versions)
+            console.log("Installing just and uv...");
+            await run.command("mise use just@latest");
+            await run.command("mise use uv@latest");
+
+            // Activate mise environment for the build
+            // This ensures just/uv are available in PATH
+            await run.command("mise activate bash");
+
+            // Update PATH for the rest of the build
+            const miseBinDir = `${process.env.HOME}/.local/share/mise/shims`;
+            process.env.PATH = `${miseBinDir}:${process.env.PATH}`;
+
+            console.log("✓ Build tools installed successfully");
+        } catch (error) {
+            // Fail the build if tool installation fails
+            build.failBuild("Failed to install build tools", { error });
+        }
+    },
+};

plugins/netlify-plugin-install-tools/manifest.yml

@@ -0,0 +1,2 @@
+name: netlify-plugin-install-tools
+inputs: []

plugins/netlify-plugin-install-tools/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "netlify-plugin-install-tools",
+  "version": "1.0.0",
+  "description": "Installs mise, just, and uv for Netlify builds",
+  "main": "index.js",
+  "keywords": ["netlify", "netlify-plugin", "mise", "just", "uv"]
+}

publishconf.py

@@ -2,17 +2,20 @@
 # -*- coding: utf-8 -*- #
 from __future__ import unicode_literals
 
+import multiprocessing
+
 # This file is only used if you use `make publish` or
 # explicitly specify it as your config file.
-
 import os
 import sys
-import multiprocessing
 
 sys.path.append(os.curdir)
 from pelicanconf import *  # noqa: F403, E402
 
-SITEURL = "https://offby1.website"
+if "SITEURL" in os.environ:
+    SITEURL = os.environ["SITEURL"]
+else:
+    SITEURL = "https://offby1.website"
 RELATIVE_URLS = False
 
 FEED_DOMAIN = SITEURL