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Four export/publishing commands shelled out to external tools without checking they exist, so a missing tool surfaced as an opaque process error — or, for reveal.js, a silently broken presentation. I added a command-time guard to each that names the tool and what's needed:
- zathura, in the pandoc PDF export-and-open command
- the hugo binary and the platform file-manager opener, in hugo-config
- the local reveal.js checkout (run scripts/setup-reveal.sh), shared by the reveal export and preview commands
- pandoc, in the web-clip protocol handler
The checks run only when the command runs, so startup stays quiet. Each guard has a test asserting the user-error fires when the tool is absent, and the existing happy-path tests now stub the lookups so they exercise the real path rather than tripping the new guard.
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Sibling tests covered the header template, title-to-filename slug, and the headers-remove pass. This file fills in the rest:
- `cj/--reveal-preview-export-on-save`: exports in org-mode, skips otherwise.
- `cj/--reveal-ensure-header`: inserts when absent, no-op (no prompt) when already present.
- `cj/reveal-export`: errors outside org-mode, opens HTML in browser otherwise.
- `cj/reveal-preview-start`: installs the buffer-local after-save-hook + exports once; errors outside org-mode.
- `cj/reveal-preview-stop`: removes the hook + messages.
- `cj/reveal-insert-header`: errors outside org-mode, errors when headers already present, inserts and reports otherwise.
- `cj/reveal-remove-headers`: errors outside org-mode, messages the removed line count.
- `cj/reveal-new`: errors when target file already exists.
ox-reveal's `org-reveal-export-to-html` and `browse-url-of-file` are stubbed.
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