133 lines
3.6 KiB
Plaintext
133 lines
3.6 KiB
Plaintext
/* Tool to sort attribute sets. Primarily useful for keeping
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all-packages.nix tidy.
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To compile:
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$ strc -i ../../maintainers/scripts/sort-attrs.str -la stratego-lib
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Typical invocation:
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$ sglr -m -p ~/Dev/nix/src/libexpr/nix.tbl -i all-packages.nix \
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| implode-asfix --lex \
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| ../../maintainers/scripts/sort-attrs \
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| asfix-yield
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*/
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module sort-attrs
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imports
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libstratego-lib
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libstratego-sglr
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strategies
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no-wsp = !appl(prod([], cf(opt(layout())), no-attrs()), [])
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rules
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list-sep(s): [] -> []
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list-sep(s): [x | xs] -> [[x | before] | <list-sep(s)> [split | after]]
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where
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<split-fetch-keep(s)> xs => (before, split, after)
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list-sep(s): [x | xs] -> [[x | xs]]
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where
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<not(split-fetch-keep(s))> xs
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list-sep-end(s): xs -> [<conc> (before, [split]) | <list-sep-end(s)> after]
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where
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<split-fetch-keep(s)> xs => (before, split, after)
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list-sep-end(s): xs -> [xs]
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where
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<not(split-fetch-keep(s))> xs
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sort-attrs:
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appl(p@prod(_, _, attrs([term(cons("Attrs"))])),
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[ lit("{")
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, ws1
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, appl(p2@list(cf(iter-star(sort("Bind")))), attrs)
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, ws2
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, lit("}")
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]
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) ->
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appl(p, [lit("{"), <no-wsp>, appl(p2, <concat> attrs'), ws2, lit("}")])
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where
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<debug> "found it";
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<attach-wsp> [ws1 | attrs] => withWSP;
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<list-sep(starts-section)> withWSP => groups;
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<length; debug> groups;
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<map({x', x'', x''', xs', starts, starts': \[x | xs] -> [x''' | xs']
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where
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<remove-section-start> x => (x', starts);
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<map(regularise-empty-lines); qsort(compare-attrs)> [x' | xs] => [x'' | xs'];
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<[] <+ \x -> ["\n\n\n" | x]\ > starts => starts';
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<debug; prepend-layout; debug> (starts', x'') => x'''
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\ })> groups => attrs';
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<debug> "did it"
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attach-wsp: [a, b | cs] -> [(a, b) | <attach-wsp> cs]
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attach-wsp: [] -> []
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strategies
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starts-section =
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?x@(appl(prod([cf(layout())], cf(opt(layout())), no-attrs()), cs), attr);
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<implode-string; is-substring(!"###")> cs;
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!x
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rules
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remove-section-start:
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(appl(prod([cf(layout())], cf(opt(layout())), no-attrs()), cs), attr) ->
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((appl(prod([cf(layout())], cf(opt(layout())), no-attrs()), cs'), attr), starts)
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where
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!cs;
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list-sep-end(?10); // separate into lines, keeping the \n
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map(implode-string);
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partition(where(is-substring(!"###"))) => (starts, rest);
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<map(explode-string); concat> rest => cs'
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regularise-empty-lines:
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(appl(prod([cf(layout())], cf(opt(layout())), no-attrs()), cs), attr) ->
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(appl(prod([cf(layout())], cf(opt(layout())), no-attrs()), cs''), attr)
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where
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// separate into lines, keeping the \n
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// last whitespace is significant, keep
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<list-sep-end(?10); split-init-last> cs => (init, last);
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<debug; filter(where(fetch-elem(not(?10 <+ ?32)))); debug; concat> init => cs'; // remove whitespace-only lines
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<concat> [<explode-string> "\n\n", cs', last] => cs''; // add one empty line
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<debug> "A";
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<debug> cs;
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<debug> cs''
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prepend-layout:
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(text, (appl(prod([cf(layout())], cf(opt(layout())), no-attrs()), cs), attr)) ->
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(appl(prod([cf(layout())], cf(opt(layout())), no-attrs()), cs''), attr)
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where
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<implode-string> cs => cs';
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<conc-strings; explode-string> (<concat-strings> text, cs') => cs''
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compare-attrs:
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x@
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( (_, appl(p1@prod(_, _, attrs([term(cons("Bind"))])), [id1 | xs1]))
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, (_, appl(p2@prod(_, _, attrs([term(cons("Bind"))])), [id2 | xs2]))
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)
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-> x
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where
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<string-lt> (id1, id2)
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strategies
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main = io-wrap(
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oncetd(sort-attrs)
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)
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