Merge branch 'milloni/horizon-export' into 'master'

Regenerate using horizon-gen-nix c9e8b2f8

See merge request horizon/horizon-gen-nix!17

ChangeLog.md

 # Changelog for horizon-gen-nix
 
+## v0.4.0
+
+* Support horizon-spec 0.4.1
+
 ## v0.3.1
 
 * Remove broken --force flag.

README.md

 # horizon-gen-nix
 
+
 horizon-gen-nix is an executable for generating nix expressions
 from [horizon-spec](https://hackage.haskell.org/package/horizon-spec)
 dhall definitions.
 
 ```
-Usage: horizon-gen-nix [--input-file INPUT_FILE] [--packages-dir PACKAGES_DIR]
-                       COMMAND
+Usage: horizon-gen-nix [--input-file INPUT_FILE]
 
 Available options:
   -h,--help                Show this help text
   --input-file INPUT_FILE  The name of the input file.
-  --packages-dir PACKAGES_DIR
-                           The directory to put haskell packages.
+```
+
+## Example input
 
-Available commands:
-  make-package-set         Run in MakePackageSet Mode
-  overlay                  Run in Overlay Mode
+The input file mentioned in the previous sections contains a dhall expression of
+the `HorizonExport` type (see `horizon-spec`).
+
+Here is an example input file:
+
+```
+let H =
+      https://gitlab.homotopic.tech/horizon/horizon-spec/-/raw/0.4.1/dhall/package.dhall
+        sha256:9f2def711ea8796cdb24fa837da6681f9a7e752f87aeff08eee9b494c6e3374c
+
+in  H.HorizonExport.MakeOverlay
+      { packagesDir = "pkgs"
+      , overlayFile = "overlay.nix"
+      , overlay =
+        [ H.callHackage "cabal2nix" "2.19.1"
+        , H.callHackage "distribution-nixpkgs" "1.7.0.1"
+        , H.callHackage "horizon-spec" "0.4.1"
+        ]
+      }
 ```
 
 ## Building

flake.lock

@@ -92,11 +92,11 @@
     "horizon-gen-nix": {
       "flake": false,
       "locked": {
-        "lastModified": 1669969509,
-        "narHash": "sha256-Cx4ZhQcCrP33QaCJcDBGS7wPYZH/JsN+RIdUoe5vTBs=",
+        "lastModified": 1670941173,
+        "narHash": "sha256-z7UgsXtgXJ6IYnfJkhtIjK4hQ7LNghcWRkt+oRN+Gx0=",
         "ref": "master",
-        "rev": "e7a49a0e69e06a191547a6ae102248cc9cd8a6f1",
-        "revCount": 102,
+        "rev": "c9e8b2f80b934561ce078c00500f3bfb0dbf8fff",
+        "revCount": 105,
         "type": "git",
         "url": "https://gitlab.homotopic.tech/horizon/horizon-gen-nix"
       },

horizon.dhall

 let H =
-      https://gitlab.homotopic.tech/horizon/horizon-spec/-/raw/0.3.0/dhall/package.dhall
-        sha256:968e76de41a8e2a187704ee9288c361f33e4df2dc458bbad10d2c6e4c8744ae5
+      https://gitlab.homotopic.tech/horizon/horizon-spec/-/raw/0.4.1/dhall/package.dhall
+        sha256:9f2def711ea8796cdb24fa837da6681f9a7e752f87aeff08eee9b494c6e3374c
 
-in  [ H.callHackage "cabal2nix" "2.19.1"
-    , H.callHackage "distribution-nixpkgs" "1.7.0.1"
-    , H.callHackage "horizon-spec" "0.4.1"
-    ]
+in  H.HorizonExport.MakeOverlay
+      { packagesDir = "pkgs"
+      , overlayFile = "overlay.nix"
+      , overlay =
+        [ H.callHackage "cabal2nix" "2.19.1"
+        , H.callHackage "distribution-nixpkgs" "1.7.0.1"
+        , H.callHackage "horizon-spec" "0.4.1"
+        ]
+      }