lists: basic working app

lists

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+#!/usr/bin/env python3
+"""Smol listing manager."""
+
+import smolcgi as scgi
+
+if not (user_hash := scgi.cert_hash):
+    scgi.exit_with_header(60, "You need a certificate to use this app")
+
+import string
+import subprocess
+from os import getenv
+from pathlib import Path
+
+STORAGE_PATH = Path(getenv("GEMINI_LISTS_PATH", "/var/gemini/lists"))
+if not STORAGE_PATH.exists():
+    STORAGE_PATH.mkdir(parents=True)
+
+ALLOWED_LIST_NAME_CHARS = string.ascii_lowercase + string.digits + "_"
+
+def get_user_dir():
+    user_dir = STORAGE_PATH / user_hash[7:]
+    if not user_dir.is_dir():
+        user_dir.mkdir()
+    return user_dir
+
+def show_lists():
+    user_dir = get_user_dir()
+    scgi.header(20, "text/gemini")
+    print("# Lists")
+    for child in user_dir.iterdir():
+        if child.is_file():
+            print(f"=> ./{child.name} 📄 {child.name}")
+    print("=> ./_/create ✨ Create a new list")
+
+def show_list(list_name):
+    list_file = get_user_dir() / list_name
+    try:
+        with open(list_file, "rt") as f:
+            content = f.read()
+    except FileNotFoundError:
+        scgi.not_found()
+    else:
+        scgi.header(20, "text/gemini")
+        print("# " + list_name)
+        print(content)
+        print(f"=> ./{list_name}/add Append item")
+        print(f"=> ./{list_name}/pop Pop first item")
+    
+def process_action(list_name, action):
+    if list_name == "_" and action == "create":
+        process_creation()
+    elif action == "add":
+        process_add(list_name)
+    elif action == "pop":
+        process_pop(list_name)
+    else:
+        scgi.not_found()
+
+def process_creation():
+    if not (new_list_name := scgi.query):
+        meta = "List name (allowed chars: lowercase, digits, underscore)"
+        scgi.require_input(meta)
+    else:
+        for char in new_list_name:
+            if char not in ALLOWED_LIST_NAME_CHARS:
+                scgi.temp_error(f"Illegal character in list name: {char}")
+        list_file = get_user_dir() / new_list_name
+        list_file.touch(mode=0o660)
+        redirect_to_list(new_list_name)
+
+def process_add(list_name):
+    if not (item := scgi.query):
+        scgi.require_input("Enter your item")
+    else:
+        if "\n" in item:
+            scgi.temp_error("No new line allowed in item.")
+        line = f"* {item}\n"
+        list_file = get_user_dir() / list_name
+        try:
+            with open(list_file, "at") as f:
+                f.write(line)
+        except FileNotFoundError:
+            scgi.not_found()
+        else:
+            redirect_to_list(list_name)
+
+def process_pop(list_name):
+    list_file = get_user_dir() / list_name
+    subprocess.run(["sed", "-i", "1d", str(list_file)])
+    redirect_to_list(list_name)
+
+def redirect_to_list(list_name):
+    scgi.redirect_temp(scgi.script + "/" + list_name)
+
+path_components = scgi.path.lstrip("/").split("/", maxsplit=1)
+list_name = path_components[0]
+action = path_components[1] if len(path_components) > 1 else ''
+if not list_name:
+    show_lists()
+elif not action and list_name != "_":
+    show_list(list_name)
+else:
+    process_action(list_name, action)