40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
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popcount
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========
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This script is used to count the popularity for each package in `nixpkgs`, by
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determining how many other packages depend on it.
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It skips over all packages that fail to build, are not cached or are unfree -
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but these omissions do not meaningfully affect the statistics.
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It currently does not evaluate nested attribute sets (such as
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`haskellPackages`).
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## Usage
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1. Generate a list of all top-level attributes in `nixpkgs`:
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```shell
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nix eval '(with builtins; toJSON (attrNames (import <nixpkgs> {})))' | jq -r | jq > all-top-level.json
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```
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2. Run `./popcount > all-runtime-deps.txt`
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3. Collect and count the results with the following magic incantation:
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```shell
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cat all-runtime-deps.txt \
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| sed -r 's|/nix/store/[a-z0-9]+-||g' \
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| sort \
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| uniq -c \
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| sort -n -r \
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| awk '{ print "{\"" $2 "\":" $1 "}"}' \
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| jq -c -s '. | add | with_entries(select(.value > 1))' \
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> your-output-file
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```
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In essence, this will trim Nix's store paths and hashes from the output,
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count the occurences of each package and return the output as JSON. All
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packages that have no references other than themselves are removed from the
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output.
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