feat(ls-remote): add lts option to show only lts version

docs/commands.md

@@ -571,6 +571,10 @@ OPTIONS:
             [default: info]
             [possible values: quiet, info, all, error]
 
+        --lts [<LTS>]
+            List lts version. use --lts to list all lts version. use --lts=hydrogen to filter lts
+            version
+
         --node-dist-mirror <NODE_DIST_MIRROR>
             https://nodejs.org/dist/ mirror
 

src/commands/ls_remote.rs

@@ -1,24 +1,79 @@
 use crate::config::FnmConfig;
-use crate::remote_node_index;
+use crate::remote_node_index::{self, IndexedNodeVersion};
 use thiserror::Error;
 
-#[derive(clap::Parser, Debug)]
-pub struct LsRemote {}
+#[derive(Debug)]
+enum LtsOption {
+    Bool(bool),
+    String(String),
+}
 
-impl super::command::Command for LsRemote {
-    type Error = Error;
+impl std::str::FromStr for LtsOption {
+    type Err = String;
 
-    fn apply(self, config: &FnmConfig) -> Result<(), Self::Error> {
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(LtsOption::String(s.to_owned()))
+    }
+}
+
+#[derive(clap::Parser, Debug)]
+pub struct LsRemote {
+    /// List lts version.
+    /// use --lts to list all lts version.
+    /// use --lts=hydrogen to filter lts version.
+    #[clap(long)]
+    lts: Option<Option<LtsOption>>,
+}
+
+impl LsRemote {
+    fn run(self, config: &FnmConfig) -> Result<Vec<IndexedNodeVersion>, Error> {
         let all_versions = remote_node_index::list(&config.node_dist_mirror)?;
 
-        for version in all_versions {
+        let (lts, lts_name) = match self
+            .lts
+            .unwrap_or(Some(LtsOption::Bool(false)))
+            .unwrap_or(LtsOption::Bool(true))
+        {
+            LtsOption::Bool(lts) => (lts, String::from("")),
+            LtsOption::String(lts_name) => (true, lts_name.trim().to_owned()),
+        };
+
+        let avaliable_versions = if lts {
+            all_versions
+                .into_iter()
+                .filter(|version| version.lts.is_some())
+                .filter(|version| {
+                    lts_name.is_empty()
+                        || version
+                            .lts
+                            .as_deref()
+                            .unwrap_or_default()
+                            .to_lowercase()
+                            .contains(&lts_name.to_lowercase())
+                })
+                .collect()
+        } else {
+            all_versions
+        };
+
+        for version in &avaliable_versions {
             print!("{}", version.version);
             if let Some(lts) = &version.lts {
                 print!(" ({lts})");
             }
             println!();
         }
 
+        Ok(avaliable_versions)
+    }
+}
+
+impl super::command::Command for LsRemote {
+    type Error = Error;
+
+    fn apply(self, config: &FnmConfig) -> Result<(), Self::Error> {
+        self.run(&config)?;
+
         Ok(())
     }
 }
@@ -31,3 +86,43 @@ pub enum Error {
         source: crate::http::Error,
     },
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_ls_remote() {
+        let config = FnmConfig::default();
+
+        let all_versions = remote_node_index::list(&config.node_dist_mirror).unwrap();
+        let versions = LsRemote { lts: None }.run(&config).unwrap();
+
+        assert!(all_versions.len() == versions.len());
+    }
+
+    #[test]
+    fn test_ls_remote_with_lts() {
+        let config = FnmConfig::default();
+
+        let versions = LsRemote { lts: Some(None) }.run(&config).unwrap();
+
+        assert!(versions.iter().all(|version| version.lts.is_some()));
+    }
+
+    #[test]
+    fn test_ls_remote_with_lts_and_filter() {
+        let config = FnmConfig::default();
+        let filter_name = "drogen";
+
+        let versions = LsRemote {
+            lts: Some(Some(LtsOption::String(filter_name.to_owned()))),
+        }
+        .run(&config)
+        .unwrap();
+
+        assert!(versions.iter().all(|version| {
+            version.lts.is_some() && version.lts.as_deref().unwrap().contains(filter_name)
+        }));
+    }
+}