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tvl-depot/tools/nixery/popcount
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Vincent Ambo 987a90510a fix(popcount): Accommodate upstream changes on nixos.org 
Channel serving has moved to a new subdomain, and the redirect
semantics have changed. Instead of serving temporary redirects,
permanent redirects are now issued.

I've reported this upstream as a bug, but this workaround will fix it
in the meantime.
2020-07-25 14:43:21 +01:00
..
default.nix fix(popcount): Fix nix-build -A nixery-popcount 2020-02-26 08:31:46 +00:00
popcount.go fix(popcount): Accommodate upstream changes on nixos.org 2020-07-25 14:43:21 +01:00
README.md feat(popcount): Clean up popularity counting script 2019-08-14 00:02:04 +01:00

README.md

popcount

This script is used to count the popularity for each package in nixpkgs, by determining how many other packages depend on it.

It skips over all packages that fail to build, are not cached or are unfree - but these omissions do not meaningfully affect the statistics.

It currently does not evaluate nested attribute sets (such as haskellPackages).

Usage

  1. Generate a list of all top-level attributes in nixpkgs:

    nix eval '(with builtins; toJSON (attrNames (import <nixpkgs> {})))' | jq -r | jq > all-top-level.json

  2. Run ./popcount > all-runtime-deps.txt

  3. Collect and count the results with the following magic incantation:

    cat all-runtime-deps.txt \
  | sed -r 's|/nix/store/[a-z0-9]+-||g' \
  | sort \
  | uniq -c \
  | sort -n -r \
  | awk '{ print "{\"" $2 "\":" $1 "}"}' \
  | jq -c -s '. | add | with_entries(select(.value > 1))' \
  > your-output-file

    In essence, this will trim Nix's store paths and hashes from the output, count the occurences of each package and return the output as JSON. All packages that have no references other than themselves are removed from the output.