My Emacs configuration https://git.cjennings.net/dotemacs/atom?h=main 2026-05-10T19:42:04+00:00 2026-05-10T19:42:04+00:00 Craig Jennings c@cjennings.net 2026-05-10T19:42:04+00:00 urn:sha1:16396d25c2795bd7f8822a695de111d07f588b26 Phase 4 of utility-consolidation. Three previously-overlapping helpers (system-utils' `cj/identify-external-open-command' and `cj/--open-with-is-launcher-p', plus the dirvish-only `cj/--file-manager-program-for' shipped earlier today) all answered "which OS-open program should I run?". Pull the answer into one place: external-open.el. Move and rename: - `cj/--open-with-is-launcher-p' (system-utils) -> `cj/external-open-launcher-p' (external-open). Public name now matches its module. - `cj/identify-external-open-command' (system-utils) -> `cj/external-open-command' (external-open). Returns nil for unsupported hosts instead of signaling -- callers that need a command must handle nil explicitly. The wrapper `cj/xdg-open' (also moved into external-open) converts nil to a `user-error' with a clear message, preserving the user-facing failure shape. - Delete dirvish's `cj/--file-manager-program-for' helper. `cj/dirvish-open-file-manager-here' now calls `cj/external-open-command' directly. The shell-command fallback for nil-program preserves the previous escape hatch. Break the system-utils <-> external-open recursive require by moving `cj/xdg-open' (the only system-utils function that external-open used) into external-open along with the dispatch. Tests reorganized to match the move. Two new test files (`test-external-open-command.el', `test-external-open-launcher-p.el') replace the two system-utils-named test files. The dirvish file-manager-program test goes away with the helper. 11 tests covering Normal/Boundary/Error for the dispatch (plus the new "unsupported host returns nil" contract). Add `(require \='external-open)' to system-utils.el and `(require \='system-lib)' to external-open.el (for `cj/file-from-context' which xdg-open uses). 2026-05-10T18:31:04+00:00 Craig Jennings c@cjennings.net 2026-05-10T18:31:04+00:00 urn:sha1:32e57be15a48aa24470e9f3bc6a206c7624bd6b0 `cj/dirvish-open-file-manager-here' had its platform-dispatch -- xdg-open / open / explorer / shell fallback -- inline as a four-arm cond branching on `executable-find' and `system-type'. Lift the choice into `cj/--file-manager-program-for', a pure function from (HAS-XDG-OPEN-P SYSTEM-TYPE) to a program-name string or nil. The wrapper resolves the live values, asks the helper, and either calls the program or falls back to a shell-command. Six Normal/Boundary tests cover the four return shapes (xdg-open across system types, darwin/windows-nt without xdg-open, the nil fallback for plain Linux without xdg-open and for unknown system-types like Haiku).