39 lines
1.2 KiB
Markdown
39 lines
1.2 KiB
Markdown
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`:
|
|
|
|
```shell
|
|
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:
|
|
|
|
```shell
|
|
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.
|