feat: solve groups for conda (prefix-dev#783)

Co-authored-by: Ruben Arts <[email protected]>

examples/solve-groups/.gitattributes

@@ -0,0 +1,2 @@
+# GitHub syntax highlighting
+pixi.lock linguist-language=YAML

examples/solve-groups/.gitignore

@@ -0,0 +1,2 @@
+# pixi environments
+.pixi

examples/solve-groups/pixi.toml

@@ -0,0 +1,30 @@
+[project]
+name = "solve-groups"
+version = "0.1.0"
+description = "Add a short description here"
+authors = ["Bas Zalmstra <[email protected]>"]
+channels = ["conda-forge"]
+platforms = ["win-64", "linux-64", "osx-64", "osx-arm64"]
+
+[feature.max_py310.dependencies]
+python = "<=3.10"
+pydantic = "*"
+
+[feature.min_py38.dependencies]
+python = ">=3.8"
+py-rattler = "*"
+
+[environments]
+# The solve-group mixes the dependencies of all features in the group and solves them together.
+# Both environments should have at most python 3.10, even though `min-py38` environment only
+# specifies a lower bound.
+#
+# The environments do not contain any dependencies from the other environments. This means that
+# the `min-py38` environment does not contain `pydantic` and the `max-py310` environment does not
+# contain `py-rattler`.
+min-py38 = { features = ["min_py38"], solve-group = "group1" }
+max-py310 = { features = ["max_py310"], solve-group = "group1" }
+
+# The default environment does not specify a solve-group which means the python version does not
+# have an upperbound.
+default = ["min_py38"]

src/cli/info.rs

@@ -303,7 +303,9 @@ pub async fn execute(args: Args) -> miette::Result<()> {
                             .features(true)
                             .map(|feature| feature.name.clone())
                             .collect(),
-                        solve_group: env.manifest().solve_group.clone(),
+                        solve_group: env
+                            .solve_group()
+                            .map(|solve_group| solve_group.name().to_string()),
                         environment_size: None,
                         dependencies: env
                             .dependencies(None, Some(Platform::current()))