Previously, `parseToolCall()` was using `computeAutoApproval()`, which
was a somewhat parallel implementation of `canAutoApprove()` in order to
get `SafeCommandReason` metadata for presenting information to the user.
The only function that was using `SafeCommandReason` was
`useMessageGrouping()`, but it turns out that function was unused, so
this PR removes `computeAutoApproval()` and all code related to it.
More importantly, I believe this fixes
https://github.com/openai/codex/issues/87 because
`computeAutoApproval()` was calling `parse()` from `shell-quote` without
wrapping it in a try-catch. This PR updates `canAutoApprove()` to use a
tighter try-catch block that is specific to `parse()` and returns an
appropriate `SafetyAssessment` in the event of an error, based on the
`ApprovalPolicy`.
Signed-off-by: Michael Bolin <mbolin@openai.com>
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