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Diffstat (limited to 'docs/open-questions.md')
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1 files changed, 16 insertions, 1 deletions
diff --git a/docs/open-questions.md b/docs/open-questions.md index db491213..a2ce2086 100644 --- a/docs/open-questions.md +++ b/docs/open-questions.md @@ -6,7 +6,22 @@ picked up without redoing the research. ## Where does an unknown command word run? Raised 2026-09-27 in the review of pardes against acme (Plan 9 source at -`~/05-genizah/principia-softwarica`). Undecided. +`~/05-genizah/principia-softwarica`). + +**Decided 2026-09-28: a command pane.** Clicked or written at an interactive +terminal at its prompt, the line is typed into that shell, whose state the +clicker can see. From anywhere else it runs as its own terminal pane whose +child is `$SHELL -c` the line in the pane's directory: full emulation +(colours, `less`, `vim`, `sudo`'s prompt work), the exit status from waiting +on the child (`exit N`, `exit 127` for a misspelling, no prompt marks +needed), Kill signalling its process group, `run`/`exit` records in the log, +and `exec` answering its serial. One command pane per directory is reused +once done, and keeps what it showed, as acme appends to `+Errors` and never +clears it (util.c:213-221). Chosen over acme's process-into-`+Errors` because +it keeps interactive programs working without a streaming runner, and over +a PATH check before typing into a shell, which misjudges builtins, aliases +and functions and leaves the shell's state in the way. The analysis below is +what it was decided from. **Today.** A middle-click, an `exec` write or a tag word that is not a builtin is typed into a terminal pane: the pane itself when it takes a command line, |