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Notes: plain text notes on the SD card, with an editor that saves by itself (#19)

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The Notes App lists the files of /notes by their first line, newest first:
n starts a note, Enter opens it, r renames its file, d deletes it after
asking, s sorts by name. A new note's file is named after its first line.

The editor wraps at spaces, 38 columns by 8 rows; Fn+arrows move through
the wrapped text, Ctrl+A and Ctrl+E go to the ends of the line. There is no
save key: the note is written five seconds after the last key, on Back, on
leaving the App, when the screen turns off and before the device powers
off. A save writes a temporary file and puts it in the note's place; a save
cut short is put back, or offered, the next time.

A note is up to 16 KB, held in one buffer reserved when it's opened: the
file is read straight into it and typing never makes it grow. A failed
allocation aborts on this device, and with IRC connected the largest free
block is about 31 KB: a first version that copied the note once on loading
restarted the device when a full note was opened with IRC connected.
Editing files of any size is #47.

The Storage App's text viewer gets `e`, which edits a text file up to 16 KB
with the same editor unless the file is read-only.

439 host tests. Checked on the device: docs/milestones/F1.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT
This commit is contained in:
twisla
2026-10-06 10:08:10 +02:00
co-authored by Claude Opus 5.5
parent c868977f1c
commit e8a654a15f
17 changed files with 1599 additions and 9 deletions
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src/main.cpp
+5 -1
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@@ -13,6 +13,7 @@
#include "apps/irc_app.h"
#include "apps/launcher_app.h"
#include "apps/lora_scanner_app.h"
#include "apps/notes_app.h"
#include "apps/settings_app.h"
#include "apps/storage_app.h"
#include "apps/system_app.h"
@@ -210,7 +211,10 @@ void setup() {
apps->registerApp({"gnss", "GNSS", false, new GnssApp(*gnssService, settings)});
apps->registerApp({"gemini", "Gemini", false, new GeminiApp(*geminiService)});
apps->registerApp({"lora", "LoRa Scanner", false, new LoraScannerApp(*radioService, *loraCapture, settings, *clockService)});
apps->registerApp({"storage", "Storage", false, new StorageApp(*fileOps, *storageService, *clockService, *update, bus)});
apps->registerApp({"storage", "Storage", false, new StorageApp(*fileOps, *storageService, *clockService, *update, *power, bus)});
apps->registerApp({"notes", "Notes", false, new NotesApp(*fileOps, *storageService, *clockService, *power)});
// Leaving the foreground App makes it save: a note being typed, when the device is powered off.
power->beforePowerOff = []() { apps->home(); };
apps->registerApp({"system", "System", false,
new SystemApp(*wifi, *battery, *storageService, *radioService, *gnssService, nvs)});
apps->registerApp({"settings", "Settings", false,