Ensure stable plugins get installed. (#1373)

crates/nu_plugin_fetch/src/nu/mod.rs

@@ -0,0 +1,40 @@
+use futures::executor::block_on;
+use nu_errors::ShellError;
+use nu_plugin::Plugin;
+use nu_protocol::{CallInfo, ReturnValue, Signature, SyntaxShape, Value};
+
+use crate::fetch::fetch_helper;
+use crate::Fetch;
+
+impl Plugin for Fetch {
+    fn config(&mut self) -> Result<Signature, ShellError> {
+        Ok(Signature::build("fetch")
+            .desc("Load from a URL into a cell, convert to table if possible (avoid by appending '--raw')")
+            .required(
+                "path",
+                SyntaxShape::Path,
+                "the URL to fetch the contents from",
+            )
+            .switch("raw", "fetch contents as text rather than a table")
+            .filter())
+    }
+
+    fn begin_filter(&mut self, callinfo: CallInfo) -> Result<Vec<ReturnValue>, ShellError> {
+        self.setup(callinfo)?;
+        Ok(vec![])
+    }
+
+    fn filter(&mut self, value: Value) -> Result<Vec<ReturnValue>, ShellError> {
+        Ok(vec![block_on(fetch_helper(
+            &self.path.clone().ok_or_else(|| {
+                ShellError::labeled_error(
+                    "internal error: path not set",
+                    "path not set",
+                    &value.tag,
+                )
+            })?,
+            self.has_raw,
+            value,
+        ))])
+    }
+}