nixpkgs/maintainers/scripts/sort-attrs.str
Eelco Dolstra 4b249f3b6f * Support grouping of attributes into sections by using "###"
comments.

svn path=/nixpkgs/trunk/; revision=6493
2006-09-11 16:18:07 +00:00

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/* Tool to sort attribute sets. Primarily useful for keeping
all-packages.nix tidy.
To compile:
$ strc -i ../../maintainers/scripts/sort-attrs.str -la stratego-lib
Typical invocation:
$ sglr -m -p ~/Dev/nix/src/libexpr/nix.tbl -i all-packages.nix \
| implode-asfix --lex \
| ../../maintainers/scripts/sort-attrs \
| asfix-yield
*/
module sort-attrs
imports
libstratego-lib
libstratego-sglr
strategies
no-wsp = !appl(prod([], cf(opt(layout())), no-attrs()), [])
rules
list-sep(s): [] -> []
list-sep(s): [x | xs] -> [[x | before] | <list-sep(s)> [split | after]]
where
<split-fetch-keep(s)> xs => (before, split, after)
list-sep(s): [x | xs] -> [[x | xs]]
where
<not(split-fetch-keep(s))> xs
sort-attrs:
appl(p@prod(_, _, attrs([term(cons("Attrs"))])),
[ lit("{")
, ws1
, appl(p2@list(cf(iter-star(sort("Bind")))), attrs)
, ws2
, lit("}")
]
) ->
appl(p, [lit("{"), <no-wsp>, appl(p2, <concat> attrs'), ws2, lit("}")])
where
<debug> "found it";
<attach-wsp> [ws1 | attrs] => withWSP;
<list-sep(starts-section)> withWSP => groups;
<length; debug> groups;
<map( \[x | xs] -> [x | <qsort(compare-attrs)> xs]\ )> groups => attrs';
<debug> "did it"
attach-wsp: [a, b | cs] -> [(a, b) | <attach-wsp> cs]
attach-wsp: [] -> []
starts-section: x@(appl(prod([cf(layout())], cf(opt(layout())), no-attrs()), cs), attr) -> x
where <debug; starts-section'> cs
starts-section': [35, 35, 35 | cs] -> 1
starts-section': [c | cs] -> <starts-section'> cs
where <not(?35)> c
compare-attrs:
x@
( (_, appl(p1@prod(_, _, attrs([term(cons("Bind"))])), [id1 | xs1]))
, (_, appl(p2@prod(_, _, attrs([term(cons("Bind"))])), [id2 | xs2]))
)
-> x
where
<string-lt> (id1, id2)
strategies
main = io-wrap(
topdown(try(sort-attrs))
)