benjivers/notes Public Public: anyone can read this; nobody can change it.

/**

 * The app in a terminal. The forge runs this on a pty when someone

 * `ssh`es to the app, over the same data as the page and through the same

 * actions, as the account at the keyboard. j/k move, a adds, d removes the

 * note under the cursor, q leaves. Plain ANSI, no dependencies.

 */

import {

  addNote,

  canDelete,

  deleteNote,

  listNotes,

  type Note,

} from "./actions.ts";

import { openDb } from "./db.ts";

import { ssh, title, where } from "./env.ts";

import { whoAtTty } from "./who.ts";

const db = openDb();

const me = whoAtTty();

const esc = "\x1b[";

const dim = (s: string): string => `${esc}2m${s}${esc}0m`;

const bold = (s: string): string => `${esc}1m${s}${esc}0m`;

const out = (s: string): void => {

  process.stdout.write(s);

};

let cursor = 0;

let typing: string | undefined;

let said = "";

const notes = (): Note[] => {

  const listed = listNotes(db, me);

  return listed.ok ? listed.value : [];

};

function draw(): void {

  const rows = notes();

  const lines = [

    `${bold(title)}  ${dim(where)}  ${dim(me.role === "anon" ? "guest" : `${me.name}${me.role === "admin" ? " (admin)" : ""}`)}`,

    ssh === undefined ? "" : dim(`connect: ${ssh}`),

    "",

  ];

  if (rows.length === 0)

    lines.push(

      dim(

        me.role === "anon"

          ? "No notes yet."

          : "No notes yet. Press a to add one.",

      ),

    );

  rows.forEach((note, i) => {

    const body = i === cursor ? bold(note.body) : note.body;

    lines.push(

      `${i === cursor ? "▸" : " "} ${body}  ${dim(`${note.author_name} · ${note.created_at.slice(0, 16).replace("T", " ")}`)}`,

    );

  });

  lines.push("");

  if (typing !== undefined) lines.push(`New note: ${typing}${esc}7m ${esc}0m`);

  else if (said !== "") lines.push(said);

  else

    lines.push(

      dim(

        me.role === "anon"

          ? "j/k move · q quit · sign in with a key the forge knows to add"

          : "j/k move · a add · d delete · q quit",

      ),

    );

  out(`${esc}2J${esc}H${lines.join("\r\n")}`);

}

process.stdin.setRawMode?.(true);

process.stdin.resume();

process.stdin.setEncoding("utf8");

draw();

process.stdin.on("data", (key: string) => {

  said = "";

  if (typing !== undefined) {

    if (key === "\r") {

      const added = addNote(db, me, { body: typing });

      if (!added.ok) said = added.message;

      typing = undefined;

      cursor = 0;

    } else if (key === "\x1b") typing = undefined;

    else if (key === "\x7f") typing = typing.slice(0, -1);

    else if (key >= " ") typing += key;

    draw();

    return;

  }

  if (key === "q" || key === "\x03") {

    out(`${esc}2J${esc}H`);

    process.exit(0);

  }

  const rows = notes();

  if (key === "j" || key === "\x1b[B")

    cursor = Math.min(cursor + 1, Math.max(0, rows.length - 1));

  if (key === "k" || key === "\x1b[A") cursor = Math.max(cursor - 1, 0);

  if (key === "a") {

    if (me.role === "anon") said = "Sign in to add a note.";

    else typing = "";

  }

  if (key === "d") {

    const note = rows[cursor];

    if (note === undefined) said = "Nothing to remove.";

    else if (!canDelete(me, note))

      said = "Only the author or an admin can remove a note.";

    else {

      const removed = deleteNote(db, me, { id: note.id });

      if (!removed.ok) said = removed.message;

      cursor = Math.min(cursor, Math.max(0, rows.length - 2));

    }

  }

  draw();

});

process.stdout.on("resize", draw);