Allow exact version number ranges when parsing config

README.md

@@ -1428,6 +1428,9 @@ package:
     #    The registry will then check if the package version is included
     #    in this range.
     - package-with-range: ">=1.1.1 <2.0.0"
+    # 4) specify an exact version
+    #    Shorthand for ">=1.2.3 <1.2.4", pinning to a specific patch version.
+    - package-with-exact-version: "1.2.3"
 
   # Optional description for the package
   description: "a useful package"

core/src/Config.purs

@@ -324,7 +324,11 @@ spagoRangeCodec = CJ.prismaticCodec "SpagoRange" rangeParse printSpagoRange CJ.s
   where
   rangeParse str =
     if str == "*" then Just widestRange
-    else hush $ Range.parse str
+    -- First try parsing as a range (e.g. ">=1.0.0 <2.0.0")
+    else case hush $ Range.parse str of
+      Just range -> Just range
+      -- Then try parsing as an exact version (e.g. "1.0.0" -> ">=1.0.0 <1.0.1")
+      Nothing -> Range.exact <$> hush (Version.parse str)
 
 printSpagoRange :: Range -> String
 printSpagoRange range =

spago.lock

@@ -1772,7 +1772,7 @@
       },
       "registry-lib": {
         "git": "https://github.com/purescript/registry-dev.git",
-        "ref": "fc203a9e2a0b96a90ace20dc6958c157cbbca16b",
+        "ref": "43194a1f079ed1e0b8e17c5d9a0e9c213ed40f49",
         "subdir": "lib"
       },
       "search-trie": {
@@ -3436,7 +3436,7 @@
     "registry-lib": {
       "type": "git",
       "url": "https://github.com/purescript/registry-dev.git",
-      "rev": "fc203a9e2a0b96a90ace20dc6958c157cbbca16b",
+      "rev": "43194a1f079ed1e0b8e17c5d9a0e9c213ed40f49",
       "subdir": "lib",
       "dependencies": [
         "aff",

spago.yaml

@@ -88,7 +88,7 @@ workspace:
   extraPackages:
     registry-lib:
       git: https://github.com/purescript/registry-dev.git
-      ref: fc203a9e2a0b96a90ace20dc6958c157cbbca16b
+      ref: 43194a1f079ed1e0b8e17c5d9a0e9c213ed40f49
       subdir: lib
     html-parser-halogen:
       dependencies:

test/Spago/Config.purs

@@ -3,10 +3,12 @@ module Test.Spago.Config where
 import Test.Prelude
 
 import Codec.JSON.DecodeError as CJ
+import Data.Map as Map
 import Data.String as String
 import Registry.License as License
 import Registry.Location (Location(..))
 import Registry.PackageName as PackageName
+import Registry.Range as Range
 import Registry.Version as Version
 import Spago.Core.Config (SetAddress(..))
 import Spago.Core.Config as C
@@ -35,6 +37,19 @@ spec =
             <> "\n\n\n-------\nActual:\n-------\n"
             <> Yaml.stringifyYaml C.configCodec parsed
 
+    Spec.it "parses exact version ranges (e.g. '1.0.0' -> '>=1.0.0 <1.0.1')" do
+      let
+        yaml = """
+          package:
+            name: test
+            dependencies:
+              - prelude: "6.0.1"
+          """
+        parsed = unsafeFromRight $ Yaml.parseYaml C.configCodec yaml
+        C.Dependencies deps = (unsafeFromJust parsed.package).dependencies
+        actual = Map.lookup (mkPackageName "prelude") deps <#> map Range.print
+      actual `Assert.shouldEqual` Just (Just ">=6.0.1 <6.0.2")
+
     Spec.it "reports errors" do
       Yaml.parseYaml C.configCodec invalidLicenseYaml `shouldFailWith`
         ( "$.package.publish.license: Could not decode PackageConfig:"