Wed 29 Jan 2025 15:04:31 +07

Author: James Stone TIL sync bot

IKEA/IKEAs-restaurant.md

@@ -0,0 +1,6 @@
+# IKEAs restaurant 
+
+IKEA is the 6th largest restaurant in the world by number of customers. 
+In 2017 there were 700 million people who ate an IKEA. Roughly 10 percent of the world.
+
+From [podcast](https://open.spotify.com/episode/6AdowJpGm8uBINgHAdDTKB?si=vGU_5gdDTriVUMJGN7nKTA%0A)

generate_screenshots.py

@@ -0,0 +1,61 @@
+import hashlib
+import pathlib
+import subprocess
+import sqlite_utils
+import tempfile
+
+root = pathlib.Path(__file__).parent.resolve()
+TMP_PATH = pathlib.Path(tempfile.gettempdir())
+SHOT_HASH_PATHS = [
+    (root / "templates" / "row.html"),
+    (root / "templates" / "til_base.html"),
+]
+
+
+def png_for_path(path):
+    page_html = str(TMP_PATH / "generate-screenshots-page.html")
+    # Use datasette to generate HTML
+    proc = subprocess.run(["datasette", ".", "--get", path], capture_output=True)
+    open(page_html, "wb").write(proc.stdout)
+    # Now use puppeteer screenshot to generate a PNG
+    proc2 = subprocess.run(
+        [
+            "puppeteer",
+            "screenshot",
+            page_html,
+            "--viewport",
+            "800x400",
+            "--full-page=false",
+        ],
+        capture_output=True,
+    )
+    png_bytes = proc2.stdout
+    return png_bytes
+
+
+def generate_screenshots(root):
+    db = sqlite_utils.Database(root / "tils.db")
+
+    # The shot_hash incorporates a hash of all of row.html
+
+    shot_html_hash = hashlib.md5()
+    for filepath in SHOT_HASH_PATHS:
+        shot_html_hash.update(filepath.read_text().encode("utf-8"))
+    shot_html_hash = shot_html_hash.hexdigest()
+
+    for row in db["til"].rows:
+        path = row["path"]
+        html = row["html"]
+        shot_hash = hashlib.md5((shot_html_hash + html).encode("utf-8")).hexdigest()
+        if shot_hash != row.get("shot_hash"):
+            png = png_for_path("/{}/{}".format(row["topic"], row["slug"]))
+            db["til"].update(path, {"shot": png, "shot_hash": shot_hash}, alter=True)
+            print(
+                "Got {} byte PNG for {} shot hash {}".format(len(png), path, shot_hash)
+            )
+        else:
+            print("Skipped {} with shot hash {}".format(path, shot_hash))
+
+
+if __name__ == "__main__":
+    generate_screenshots(root)

postgres/ddl-macros.md

@@ -0,0 +1,39 @@
+# DDL Postgres Macros
+
+In postgres you may find yourself repeating common operations on all your tables. For example adding an audit log ,created times, modified user etc.
+
+This can be tedious to add everywhere. Instead you can create a postgres "macro" to update your DDL for you
+
+
+# Example
+```postgresql
+CREATE OR REPLACE FUNCTION public.add_created_columns(  
+    table_type regclass  
+) RETURNS void  
+    LANGUAGE plpgsql  
+    SET search_path TO ''  
+AS $_$  
+declare  
+    statement text = format($$  
+        alter table %1$s 
+            add column created_user int references public."user"(id) not null,
+            add column created_at   timestamptz not null default current_timestamp;
+        $$,  
+        $1);
+begin  
+    execute statement;  
+end;  
+$_$;
+```
+
+# Usage
+
+To use the `add_created_columns` macro, you simply call it by passing the table name as a parameter. Here's an example
+of how to use it:
+
+```postgresql
+SELECT public.add_created_columns('public.orders'),
+       public.add_created_columns('public.products');
+```
+
+This will modify the specified table by adding the `created_user` and `created_at` columns as defined in the macro.