facsimile

(noun) : something clever, trevor

Terminal text editor written in Fortran. VSCode-style keybindings.

Build

Using Make (Recommended)

The Makefile provides optimized, platform-specific builds:

• macOS arm64: Uses flang-new for better apple silicon support
• macOS Intel/Linux: Uses gfortran with standard optimization flags

make
./fac [filename]

Using fpm (Development)

fpm build
./build/gfortran_*/app/fac [filename]
or 
fpm run -- [filename]

Keybindings

Navigation

• arrows - move cursor
• ctrl-a / home - smart home (toggle between first non-whitespace and column 1)
• ctrl-e / end - end of line
• alt-left/right - jump by word/punctuation group
• pageup/pagedown - page scroll
• mouse click - position cursor
• mouse wheel/trackpad - scroll viewport
• alt-[ / alt-] - jump to matching bracket

Selection

• shift-arrows - character selection
• shift-alt-left/right - word selection
• shift-ctrl-a/e - select to line start/end
• shift-home/end - select to line boundaries
• shift-pageup/pagedown - page selection
• mouse drag - select text
• esc - clear selection / exit multi-cursor mode

Editing

• backspace / ctrl-h - delete backward
• delete - delete forward
• tab - insert 4 spaces (or indent selection)
• shift-tab - dedent selection or current line
• ctrl-k - kill line forward (yank stack)
• ctrl-u - kill line backward (yank stack)
• ctrl-y - yank from stack
• ctrl-w / alt-backspace - delete word backward
• alt-d / alt-delete / fn-alt-backspace - delete word forward
• ctrl-t - transpose characters
• ctrl-j - join lines

Clipboard

• ctrl-x - cut line/selection
• ctrl-c - copy line/selection
• ctrl-v - paste

Lines

• alt-up/down - move line up/down
• alt-shift-up/down - duplicate line up/down

Multiple Cursors

• ctrl-d - select next match (creates selections + cursors)
• alt-click - add/remove cursor at position
• ctrl-alt-up - add cursor on line above
• ctrl-alt-down - add cursor on line below
• esc - exit multi-cursor mode (keep active cursor only)

Search

• ctrl-f - search forward
• ctrl-r - find and replace

Special

• alt-' - cycle quotes: " → ' → ` → "
• alt-shift-' - remove surrounding brackets/quotes
• ctrl-z - undo
• ctrl-] / ctrl-shift-z - redo (use ctrl-] if terminal intercepts ctrl-shift-z)
• ctrl-l - clear/redraw screen

File

• ctrl-s - save
• ctrl-q - quit
• ctrl-b - toggle file tree (fuss mode)

Tab Management

• ctrl-t - create new tab
• tab / shift-tab - switch between tabs

Pane Management

Split your view into multiple panes for side-by-side editing of the same file.

Creating Panes:

• alt-v - split pane vertically (creates pane to the right)
• alt-s - split pane horizontally (creates pane below)

Navigating Panes:

• alt-h / ctrl-shift-left - move to left pane
• alt-l / ctrl-shift-right - move to right pane
• alt-k / ctrl-shift-up - move to pane above
• alt-j / ctrl-shift-down - move to pane below

Managing Panes:

• alt-q - close current pane only
• ctrl-w - close current pane (closes tab when last pane)

Features:

• Each pane has independent viewport and cursor
• Line numbers display in all panes
• Active pane shows with visible cursor
• Inactive panes have subtle dark background
• Minimum pane size enforced (20 columns)

File Tree (Fuss Mode)

When in fuss mode (ctrl-b), you get a split view with a git-aware file tree on the left (30%) and editor on the right (70%).

Navigation:

• j / ↓ - move down in tree
• k / ↑ - move up in tree

Opening Files:

• enter or o - open file in new tab

Display Options:

• . - toggle hiding dotfiles and gitignored files
  • When enabled, both dotfiles and gitignored files are hidden from view
  • Directories containing only hidden files are greyed out but remain visible
  • Uses git check-ignore to detect gitignored files

Git Operations:

• a - stage file (git add)
• u - unstage file (git restore --staged)

Status Indicators:

• Green ↑ - staged changes
• Red ✗ - modified tracked files
• Gray ✗ - untracked files

Exit:

• esc - exit fuss mode back to editor
• ctrl-b - toggle fuss mode off

Help

• ctrl-/ or ctrl-? - show keybindings (ctrl-/ is more reliable)

Terminal Compatibility Notes

Some keybindings may be intercepted by your terminal emulator:

• Ctrl+A: Often intercepted by tmux/screen (use Home instead)
• Ctrl+Shift+Z: Intercepted by WezTerm in multi-pane mode (use Ctrl+] instead)
• Ctrl+': Most terminals send plain apostrophe (use Alt+' instead)
• Ctrl+Alt+Backspace: Most terminals send alt-backspace (use Alt+Shift+' instead)

For WezTerm users, add to ~/.wezterm.lua to enable Ctrl+Shift+Z:

config.keys = {
  { key = 'Z', mods = 'CTRL|SHIFT', action = wezterm.action.DisableDefaultAssignment },
}

Implementation

Gap buffer for text storage. Pure Fortran with ANSI escape sequences.

License

MIT