Adds py_require() function

DESCRIPTION

@@ -55,6 +55,7 @@ Suggests:
     cli,
     rmarkdown,
     pillar,
+    processx,
     testthat
 LinkingTo: Rcpp
 RoxygenNote: 7.3.2

NAMESPACE

@@ -74,6 +74,7 @@ S3method(print,python.builtin.list)
 S3method(print,python.builtin.module)
 S3method(print,python.builtin.object)
 S3method(print,python.builtin.tuple)
+S3method(print,python_requirements)
 S3method(py_str,default)
 S3method(py_str,python.builtin.bytearray)
 S3method(py_str,python.builtin.dict)
@@ -190,6 +191,7 @@ export(py_module_available)
 export(py_none)
 export(py_numpy_available)
 export(py_repr)
+export(py_require)
 export(py_run_file)
 export(py_run_string)
 export(py_save_object)

R/config.R

@@ -325,6 +325,14 @@ py_discover_config <- function(required_module = NULL, use_environment = NULL) {
     else
       e
   })
+
+  uv_python <- uv_get_or_create_env()
+  if(!is.null(uv_python)) {
+    return(
+      python_config(uv_python)
+    )
+  }
+
   if (!inherits(python, "error"))
     try(return(python_config(python, required_module)))
 

R/install.R

@@ -85,6 +85,27 @@ py_install <- function(packages,
 {
   check_forbidden_install("Python packages")
 
+  if (is_python_initialized() &&
+      is_uv_reticulate_managed_env(py_exe()) &&
+      is.null(envname)) {
+    if (!is.null(python_version)) {
+      stop(
+        "Python version requirements cannot be ",
+        "changed after Python has been initialized"
+      )
+    }
+    warning(
+      "An 'uv' virtual environment managed by 'reticulate' is currently in use.\n",
+      "To add more packages to your current session, call `py_require()` instead\n",
+      "of `py_install()`. Running:\n  ",
+      paste0(
+        "`py_require(", paste0(sprintf("\"%s\"", packages), collapse = ", "), ")`"
+      )
+    )
+    py_require(packages)
+    return(invisible())
+  }
+
   # if 'envname' was not provided, use the 'active' version of Python
   if (is.null(envname)) {