Single-file mode for direct file invocations#38
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When invoked as 'spiceedit somefile.md' the user is asking to look at one file, not to open a project. Skip the file-tree walk, the project-wide finder index, and the 10s background tree-refresh goroutine — none of them are visible to the user in that mode and on a large directory they're real CPU. main.go routes to a new app.NewSingleFile(path) constructor when an OpenFile is resolved; otherwise it stays on app.New(rootDir). The constructor leaves tree and finder nil, hides the sidebar, and opens the file as the first tab. The action menu's 'Show / Hide file explorer' row is filtered out via a new visibility predicate (hasTree) so the user can't try to show a sidebar that doesn't exist. The same machinery (visible func on menuItemDef) is general-purpose so future tree-dependent rows can opt in the same way. Tree-Refresh sites in fileops are routed through a small refreshTree() helper that no-ops when tree is nil.
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Summary
spiceedit somefile.mdno longer walks the surrounding directory just to render a sidebar the user didn't ask for. Newapp.NewSingleFileconstructor skips the file tree, the project-wide finder index, and the 10s background tree-refresh goroutine.visiblepredicate tomenuItemDefso future tree-dependent rows can opt in the same way.Behavior matrix
spiceeditspiceedit .spiceedit somedir/spiceedit somefile.mdTest plan
make test— all green locally with the race detectorspiceedit README.mdopens the file with no sidebar visibletime spiceedit README.mdstartup is noticeably faster thantime spiceedit .spiceedit nonexistent.mdstill works (vim-style "create on first save")spiceedit somedir/still shows the sidebar and full treehasFinder/hasActiveSubfolderand continue to behave correctly withfinder == nil/ no subfolder)