Version ranges for nixpkgs. Write constraints and a solver finds the revisions in 14 years of nixpkgs history where all of them hold. The page is a single-page application: the index, the solver, and the graph run entirely in your browser.
small one range one version medium python3 × openssl 1.1 two worlds an impossible ask big 6-way coexistence coherence two eras mixed forced to one era one everything impossibly incoherent
@ | attach a version range; a bare attr means any version |
>= > <= < = | compare in builtins.compareVersions order |
1.1.* | component-wise prefix: 3.8 accepts 3.8.9, refuses 3.81 |
3.10..3.12 | inclusive interval, prefix-inclusive upper end |
, / || | and / or |
^ | coexistence: one shared revision serves the whole group |
The solver is clingo compiled to WebAssembly, running grail's solve.lp unmodified against the nixpkgs-multiverse index. Everything is static files; nothing leaves your browser.