Meta: add builtins

[Anton-Latukha]

Which are left:
Important:

• Implement builtins.zipAttrsWith #1055
• Implement builtins.fetchGit #1034
• Implement builtins.filterSource #233
  Parts of implementation of it should be in Support uploading filtered paths to the store #755
• Implement builtins.storePath #240
• Implement builtins.builtins #273
• Implement builtins.fetchTarball through Haskell #162
• Implement builtins.path #128
  There is implementation of it in Support uploading filtered paths to the store #755
  Ported in Builtins: add path & unsafeDiscardOutputDependency #1032
• Implement builtins.groubBy Builtins: add groupBy #1033
• Implement builtins.unsafeDiscardOutputDependency
  There is implementation of it in Support uploading filtered paths to the store #755
  Ported in Builtins: add path & unsafeDiscardOutputDependency #1032
• Implement builtins.ceil (#1031) Builtins: add floor & ceil #1031
• Implement builtins.floor (#1031) Builtins: add floor & ceil #1031

Of smaller importance:

• builtins.fetchMercurial
• builtins.fromTOML

This is currently it.

[soulomoon]

Which are left: Important:

• Implement builtins.path #128
  There is implementation of it in Support uploading filtered paths to the store #755
• Implement builtins.fetchTarball #162
• Implement builtins.filterSource #233
• Implement builtins.storePath #240
• Implement builtins.builtins #273
• Implement builtins.groubBy
• Implement builtins.filterSource
• Implement builtins.storePath
• Implement builtins.unsafeDiscardOutputDependency
  There is implementation of it in Support uploading filtered paths to the store #755
• Implement builtins.fetchGit
• Implement builtins.ceil
• Implement builtins.floor

Of smaller importance:

• builtins.fetchMercurial
• builtins.fromTOML

This is currently it.

ceil and floor should be easy, and filterSource is duplicated in the list

[Anton-Latukha]

Yes. That is why I kept them in "Important", because there is no point to postpone them.

[Anton-Latukha]

I already futurePorted unsafeDiscardOutputDependency, and now trying to port path.

[Anton-Latukha]

Also ported path.

[soulomoon]

I am porting groubBy now.

---

groubBy ported

[Anton-Latukha]

fetchTarball was already implemented.

[sorki]

Nix 2.6 adds another builtin - zipAttrsWith which is a port of nixpkgs lib version.

[Anton-Latukha]

Updated the headpost & created an according report thread for it.

Be free to add such information into the headpost, especially when those are "my" messages - I encourage correcting me or adding relevant information into messages, especially in the headposts. Also notification is not needed, GitHub provides notifications and changelogging.