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tvl-depot/tools/nixery/popcount
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Vincent Ambo 2b82f1b71a refactor: Reshuffle file structure for better code layout 
This gets rid of the package called "server" and instead moves
everything into the project root, such that Go actually builds us a
binary called `nixery`.

This is the first step towards factoring out CLI-based functionality
for Nixery.
2019-11-27 14:12:38 +00:00
..
default.nix chore(build): Add nixery-popcount to top-level package set 2019-11-03 01:33:36 +00:00
popcount.go refactor: Reshuffle file structure for better code layout 2019-11-27 14:12:38 +00:00
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.