Scitano 2.0

Jeremy Anderson — info@dcos.net https://git.dcos.net/dcosnet/scitano/

A hotkey-first programmer's editor built in Rust on the iced GUI framework. Scitano combines the menu structure of SciTE, strict GNU nano hotkeys, and Geany-inspired sidebar and context features into a single unified editing environment with a VS Code Dark+ visual overhaul.

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What's New in 2.0

• VS Code Dark+ Visual Overhaul — Complete theme rewrite matching the VS Code Dark+ color palette (#0F0F0F editor, #1E1E1E panels, #007ACC accent blue)
• Production QA Pass — Five-discipline review (QA/SRE/SA/Admin/DevOps) with all findings resolved
• Data-Driven Architecture — Nested if/else chains replaced with const lookup tables (SEI CERT/MISRA/POSIX compliant)
• Bounded Memory — Chat log enforces 512 KB / 10,000 entry hard limits
• Shell-Injection Safe — All build commands use argument vectors, no format!() shell strings
• Compiler Warning Clean — Zero warnings on cargo check with targeted #[allow(dead_code)] only on future-ready API
• Clippy Lint Configuration — [lints.clippy] section with 10 SEI CERT/MISRA-aligned warnings
• Release Profile — LTO, codegen-units=1, strip=true, panic=abort for minimal binary size

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Features

• Strict Nano Hotkeys — ^K/^U kill-ring, ^O writeout, ^X exit, ^W search, and more — all faithful to GNU nano behavior
• SciTE-Style Menus — File, Edit, Search, View, Build, Tools, Syntax, Options, Help, and AI-Bridge menus across the top
• Geany-Inspired Sidebar — Symbol tree auto-parses fn, struct, impl, enum, trait, class, def, mod, and macro_rules! definitions
• Multi-Tab Editing — Multiple buffers with dirty indicators (●), right-click close, and + to create new tabs
• Syntax Highlighting — 50+ file extensions across 20+ languages with manual override via the Syntax menu
• Dual Highlight Tones — CandyPop (Base16 Ocean) and Matte (Base16 Mocha) switchable from the View menu
• Bottom Panel — Messages, Diagnostics, Build Logs, and AI Terminal panes with color-coded prefix output
• Right-Click Context Menu — Quick access to Save, Close, Build, Lint, Comment/Uncomment, and case transforms
• Build Integration — Compile-only, build-and-run, run-only, and lint with output routed to the Build Logs pane
• AI Bridge — Aider and Hermes/Odysseus integration points for AI-assisted editing
• Structured Status Bar — File name, dirty state, syntax, bookmark count, wrap mode, encoding, line endings
• Footer Hotkey Bar — Persistent nano hotkey reference always visible at the bottom

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Quickstart

Prerequisites

• Rust 1.75+ (edition 2021)
• A system display server (X11 or Wayland with XWayland)
• For linting: shellcheck, python3, gcc/g++, rustc, node (as needed per language)

Build

git clone https://git.dcos.net/dcosnet/scitano.git
cd scitano
cargo build --release

Or use the included build script:

chmod +x build.sh
./build.sh

The release binary will be at target/release/scitano.

Run

./target/release/scitano

Scitano launches with two sample buffers (hello.rs and script.py) so you can start editing immediately.

Install (system-wide)

cargo install --path .

See QUICKSTART.md for detailed setup instructions.

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Hotkey Reference

All hotkeys follow GNU nano conventions. ^ denotes Ctrl. Hotkeys are active when no text is selected and the editor has focus.

Core Nano Hotkeys

Key	Action	Description
^G	Help	Display the quick-reference hotkey list in the Messages pane
^O	WriteOut	Save the current buffer to disk
^X	Exit	Close the current tab
^K	Kill Line (Cut)	Kill text from cursor to end of line. Consecutive presses accumulate into the kill-ring: first press kills line content, second press (at EOL) kills the newline and joins with the next line, further presses continue accumulating. Any non-^K action resets the accumulation.
^U	Unkill (Paste/Yank)	Insert the entire kill-ring at the cursor position. Cursor advances to the end of the pasted text. Resets the consecutive-kill flag.
^C	Cursor Position	Display current buffer info in the Messages pane (line count, byte size, syntax, file path)
^W	Where Is (Search)	Trigger search (opens Search menu)
^\	Replace	Trigger find-and-replace
^_	Go To Line	Display line count for the current buffer
^R	Read File	Insert file at cursor (opens File menu)
^J	Justify	Paragraph reflow
^T	Spell Check	Requires system aspell

Cursor Movement

Key	Action
^A	Move to start of current line
^E	Move to end of current line
^Y	Page Up
^V	Page Down
^D	Delete character at cursor
^I	Insert tab

Build & Lint

Key	Action
^B	Build and run the current file
^L	Lint syntax of the current file

Function Keys

Key	Action
F3	Open file
F5	Execute / run
F11	Toggle full screen

Mouse

Action	Effect
Right-click on tab	Close that tab
Right-click in editor	Open context menu (Save, Build, Lint, Comment, etc.)

Kill-Ring Behavior (^K / ^U)

The kill-ring faithfully replicates GNU nano's cut/paste model:

1. Mid-line ^K — Kills all text from the cursor to the end of the current line (text only, not the line break). Cursor stays in place.
2. End-of-line ^K — Kills the newline character, joining the current line with the next. Cursor sits at the junction point.
3. Empty-line ^K — Same as end-of-line: removes the line by joining with the next.
4. Last-line ^K — No-op when the cursor is at the end of the final line; nothing to kill.
5. Consecutive ^K — Each subsequent press appends to the same kill-ring entry. For example, four presses on a 3-line block kill: line content, newline, next line content, newline — building "line one\nline two\n".
6. ^U (yank) — Inserts the full kill-ring at the current cursor position and advances the cursor to the end of the inserted text. Resets the consecutive-kill flag.
7. Chain breaking — Any action other than ^K (typing, cursor movement, mouse click, etc.) resets the kill chain so the next ^K starts a fresh kill-ring entry.

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Menu Structure

File

New · Open (F3) · Open Selected · ^O WriteOut (Save) · Save As... · ^X Close Tab · Reload File · Save Session · Load Session · Print... · Exit App

Edit

Undo (^Z) · Redo (^Y) · ^K Kill Line (Cut) · ^U Unkill (Paste) · ^C Cur Pos · ^A Select All · Delete Line · Duplicate Line · Transpose Line · Match Brace (^E) · Comment Line · Uncomment Line · Increase Indent · Decrease Indent

Search

^W Where Is (Find) · Find Next (F3) · Find Previous (Shift+F3) · ^\ Replace · Replace Next · Go To Line (^_) · Toggle Bookmark (^B) · Next Bookmark · Prev Bookmark · Clear All Bookmarks

View

Toggle Full Screen (F11) · Toggle Message Window · Toggle Sidebar · Toggle Line Numbers · Toggle Whitespace · Toggle Line Endings · Word Wrap · Toggle Syntax Tone · Fold All · Unfold All · Toggle Current Fold

Build

Compile · Build · ^B Build & Run · Run (F5) · ^L Lint Syntax · Stop Executing · Clear Output · Next Message · Previous Message

Tools

Run Command... · Run Lua Script (F5)

Syntax

Rust · Python · C/C++ · Shell · JavaScript · TypeScript · Markdown · HTML · CSS · JSON · XML · YAML · Go · Ruby · PHP · Java · C# · SQL · Clear Override

Options

Global Properties · Open Abbreviations · User Properties · Local Properties

Help

^G Help · About

AI-Bridge

Sync Aider Models · Aider: Architect Mode · Aider: Code Review · Aider: Refactor Buffer · Hermes: Local Inference · Hermes: System Prompt · Odysseus: Crawl Context · Odysseus: Vector Sync

Editor Context (right-click)

^O Save Buffer · ^X Close Tab · ^B Build File · ^L Lint Syntax · Comment Selection · Uncomment Selection · Upper Case · Lower Case · Insert Timestamp

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Supported Languages

Syntax highlighting is auto-detected by file extension. Manual override is available via the Syntax menu.

Extension	Language	Extension	Language
.rs	Rust	.rb	Ruby
.py .pyw	Python	.php .phtml	PHP
.c .h	C	.java	Java
.cpp .hpp .cc .cxx .hxx	C++	.cs	C#
.sh .bash .zsh .command	Shell	.sql	SQL
.js .mjs .cjs	JavaScript	.r	R
.ts .tsx	TypeScript	.lua	Lua
.md .markdown	Markdown	.pl .pm	Perl
.html .htm .xhtml	HTML	.ex .exs	Elixir
.css .scss .sass .less	CSS	.hs	Haskell
.json	JSON	.scala	Scala
.xml	XML	.swift	Swift
.yaml .yml	YAML	.kt .kts	Kotlin
.toml	TOML	.dart	Dart
.ps1 .psm1	PowerShell	.bat .cmd .dosbat	Batch
.conf .cfg .ini .service .target	Config/INI	.vbs .vbe	VBScript
Dockerfile / Containerfile	Dockerfile	.go	Go
Makefile	Makefile	Nginx configs	Nginx
*.rc files	Shell	Apache/httpd configs	Apache

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Project Structure

scitano/
├── Cargo.toml          # Package manifest (iced 0.13, edition 2021, GPLv2, rust-version 1.75)
├── Cargo.lock          # Dependency lockfile
├── LICENSE             # GPLv2 full text
├── build.sh            # Release build script with checks
├── QUICKSTART.md       # Detailed setup and usage guide
├── screenshot.png      # Application screenshot
├── README.md           # This file
└── src/
    ├── main.rs         # Application entry point, UI layout, hotkey routing, state machine
    ├── editor.rs       # EditorTab: buffer model, file I/O, syntax detection (table-driven), symbol parsing
    ├── config.rs       # User configuration (tab width, wrap, auto-save) with validation
    └── theme.rs        # VS Code Dark+ palette, data-driven container/button style factories

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Coding Standards Applied

This codebase follows a multi-discipline production readiness review:

• SEI CERT — Bounded memory, input validation, no shell injection, argument-vector-only commands
• MISRA — Data-driven dispatch tables instead of nested if/else, explicit loop bounds
• POSIX — Clean exit paths, no undefined behavior, structured error propagation
• PEP 868 — Table-driven configuration, declarative over imperative
• Clippy — 10 lint rules enforced: unwrap_used, indexing_slicing, arithmetic_side_effects, cast_*, integer_division, manual_range_contains

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License

GPLv2 — see LICENSE for the full text.

Jeremy Anderson — info@dcos.net — https://git.dcos.net/dcosnet/scitano/