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initial implementation of --explain

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Currently it only displays explanations of options like --in and --copies.

In the future, it should explain preferred content expression evaluation
and other decisions.

The explanations of a few things could be better. In particular,
"standard" will just appear as-is (or as "!standard" if it doesn't
match), rather than explaining why the standard preferred content expression
for the group matches or not.

Currently as implemented, it goes to stdout, and so commands like
git-annex find that have custom output will not display --explain
information. Perhaps that should change, dunno.

Sponsored-by: Dartmouth College's DANDI project
This commit is contained in:
Joey Hess 2023-07-25 16:11:06 -04:00
parent cf40e2d4b6
commit f25eeedeac
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12 changed files with 122 additions and 46 deletions
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Database/Handle.hs
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@ -125,7 +125,7 @@ commitDb' (DbHandle _ _ jobs _) a = do
case r of
Right (Right ()) -> debug "Database.Handle" "commitDb done"
Right (Left e) -> debug "Database.Handle" ("commitDb failed: " ++ show e)
Left BlockedIndefinitelyOnMVar -> debug "Database.Handle" ("commitDb BlockedIndefinitelyOnMVar")
Left BlockedIndefinitelyOnMVar -> debug "Database.Handle" "commitDb BlockedIndefinitelyOnMVar"
return r