File Editor

F3 views a file, F4 edits it, from the Files tab or its right-click menu. The file opens in its own workspace tab named after it; the machine header, the other tabs and the sidebar stay in view. A file that is already open switches to its tab.

Control	Does
EDIT / READ-ONLY	The mode. F4 or View / Edit switches without losing undo history or unsaved changes
Wrap (Alt+Z)	Wrap long lines
Tools ▾	Reload, diff, save as, backups, checks and line tools — below
Save (Ctrl+S, ⌘S)	Write the file
Status bar	Machine and path (click to copy), cursor position, line endings, encoding, language picker, Alt+/

A dot on the tab marks unsaved changes. Closing the tab, reloading the page, Release, Close Session and Reconnect ask first. Esc closes the search box, completions or a selection first, then the tab, and puts you back on the file in the list.

Highlighting

Picked from the file’s name, place and first line: nginx configs (anything under an nginx directory), systemd units, .ini / .conf / .cnf / .env and sshd_config, Dockerfiles, diffs and patches, logs (*.log, *.log.1, files under /var/log — errors red, warnings amber, debug dimmed, wrapped), shell, YAML, TOML, JSON, XML, Python, JavaScript / TypeScript, Go, PowerShell, HTML, CSS, Markdown and SQL. A script with no extension is recognised by its #! line. The status bar’s picker corrects a wrong guess.

Saving

A save keeps the file’s permissions (setuid, setgid and sticky included) and, when the agent runs as root, its owner and group. Saving through a symlink writes the file it points at. A new file is created 0644. Windows line endings are kept; the status bar shows LF, CRLF, or Mixed → LF.

A file that is not UTF-8 opens read-only with a warning, because its non-UTF-8 bytes would be written back as �; F4 asks before letting you edit it anyway. Files over 5 MB cannot be opened whole — see Large files. Binary files show a notice.

Changed on disk

If the file changed after you opened it — an upload, another admin, a deploy — the save is refused and you choose.

Choice	Does
Compare	Shows how the version on disk differs from yours
Reload from disk	Discards your changes
Overwrite with mine	Replaces the disk version
Cancel	Keeps your text so you can copy what you need

The first save of a new file is refused the same way if a file with that name appeared meanwhile. Machine files need the current agent for this; with an older one the editor saves as before and says it cannot detect such changes.

Backups

Every save of a machine file keeps the version it replaces in WoHo storage under /.backups/<machine>/<path>/, the last 10 per file. If the backup cannot be written, the save asks before going on.

Tools

Item	Does
Reload from disk (F5)	Re-reads the file. Asks first when you have unsaved changes; with the cursor at the end it stays at the new end
Diff against disk	Your changes against the file as it is now
Save as…	Writes to another path. Never replaces a file there unasked
Backups…	Pick a backup, see how it differs from the tab, load it to restore
Run a check…	Runs a template whose command uses {{path}} — nginx -t -c {{path}} — on the open file, with the output and exit code in a report tab. The path is inserted shell-quoted, so do not quote {{path}} yourself
Show whitespace	Marks spaces and tabs
Sort lines, remove duplicate or empty lines, trim trailing whitespace, line endings LF / CRLF	On the selected lines, or the whole file when nothing is selected. Edit mode only

Large files

A machine file over 5 MB — typically a log — offers Show the end and Follow it instead of opening.

Show the end displays the last 256 KiB, starting on a line, read-only, with the range in the status bar. Follow it adds what is written to the file every second, survives rotation and truncation (marked in the text), says when it skipped bytes written faster than it can show, and keeps at most 2 MB in the browser. Pause / Follow and F5 restart it. Such a view can never be saved.

Up to four files can be followed per machine at once; a follow stops by itself after an hour, and when its page is closed.

Keyboard

Alt+/ lists them in the panel. Ctrl is ⌘ on a Mac. The workspace’s own Alt shortcuts work from the editor, except Alt+← / Alt+→, which move the cursor — use Alt+1…9 for tabs.

Key	Action
Ctrl+S	Save
F4	Switch between view and edit
F5	Reload the file from disk
Esc	Close the search box, completions or selection; then the tab
Ctrl+F	Find (regex, match case, whole word)
Ctrl+H	Replace (Windows and Linux; ⌘F on a Mac)
F3 / Shift+F3	Find next / previous
Ctrl+G	Go to line
Ctrl+Shift+L	Select every match of the selection
Ctrl+D	Duplicate the line or selection
Alt+↑ / Alt+↓	Move the line (also Ctrl+Shift+↑ / ↓ on Windows and Linux)
Shift+Alt+↓ / ↑	Copy the line below / above
Ctrl+Shift+K	Delete the line
Ctrl+/	Comment or uncomment
Tab / Shift+Tab	Indent / outdent. Ctrl+M then Tab leaves the editor
Ctrl+U / Ctrl+Shift+U	Lower / upper case
Ctrl+Space	Complete a word already in the file (completions never pop up on their own)
Ctrl+Alt+↓ / ↑, Alt+drag	Add a cursor below / above; select a column
Ctrl+Shift+[ / ]	Fold / unfold the block
Ctrl+Z / Ctrl+Y	Undo / redo
Alt+Z	Wrap long lines