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Folding is the expensive half of a name test on a name with diacritics,
and every name test of every rule folded the same name again: on Polish
names it was most of the matching work. The per-file facts memoise it,
which is where one file's work belongs - the object is per file and per
goroutine, so no lock.
4000 Polish names, twelve rules with name tests: 0.33s -> 0.13s
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max-read gates on file size before reading, then the text was read
whole and decoded: a file that is not valid UTF-8 decodes one byte per
code point and doubles, and normalising and folding copy that again per
set of options, with GOMAXPROCS files in flight. Twelve 40 MB files
reached 3.3 GB - enough to put a laptop into the OOM killer, with no
attacker involved, just a few big .log or .csv files.
Two bounds. The decoded text is cut to max-read at a rune boundary, so
the ceiling means what a reader takes it to mean. And extraction of
files at or above 4 MiB is rationed to two at a time, since holding
several large texts at once is what multiplies the ceiling; smaller
files, which is nearly all of them, are untouched.
twelve 40 MB files: peak RSS 3294 MB -> 728 MB, wall 27s -> 46s
two thousand small files: 0.05s both ways
The wall-clock cost falls entirely on large files needing extraction,
and buys a program that finishes instead of being killed.
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So that go install can find it. cgit serves no go-import meta tag, so
nginx answers a ?go-get=1 request for /NAME with one pointing at
https://git.labunix.xyz/NAME.git; the alternative was carrying a .git
suffix through every import line forever.
One sed over the imports, both go.mod files, and the dependency gate's
whitelist. Nothing else depends on the path. go install works from the
next tag, the first release whose go.mod carries it.
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About 340 comments cited the development process: task and plan
numbers, fix waves, rulings, reviewers, and the author in the third
person with a date. None of that exists outside the work itself, so to
a reader it pointed at nothing. Each one now states the engineering
reason it was standing in front of; where a comment was provenance and
nothing else, it is gone.
References to docs/design.md and docs/gui-design.md by section stay:
both ship with the repository. The design documents lose their
amendment diaries - CHANGELOG.md is that record - and the GUI's says
plainly that the window has gone further than the document.
Only comments changed. Every .go file was parsed and its code printed
with comments stripped, before and after: the two hashes are identical
across all 175 files.
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unreadable file alone
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removed keywords
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Each file shows its steps, then the rule and the reason it matched, one
field per line; on a terminal every line wraps to its width with
continuation lines under their own column, and piped output is never
wrapped. Choosing per file shows the same block. -P / --no-pager prints
the plan without the pager. A duplicate's original is shown with ~.
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explain, dry run
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