feat(list-remote): introduce --latest-lts option

Schniz · Mar 11, 2025 · e525841 · e525841
1 parent 64ef825
commit e525841
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Showing 3 changed files with 32 additions and 13 deletions.
diff --git a/docs/commands.md b/docs/commands.md
@@ -127,6 +127,9 @@ Options:
 
           [env: FNM_ARCH]
 
+      --latest-lts
+          Show the latest version of each LTS
+
       --version-file-strategy <VERSION_FILE_STRATEGY>
           A strategy for how to resolve the Node version. Used whenever `fnm use` or `fnm install` is called without a version, or when `--use-on-cd` is configured on evaluation
 

diff --git a/src/commands/ls_remote.rs b/src/commands/ls_remote.rs
@@ -1,7 +1,6 @@
 use crate::config::FnmConfig;
-use crate::remote_node_index;
+use crate::remote_node_index::{self, IndexedNodeVersion};
 use crate::user_version::UserVersion;
-
 use colored::Colorize;
 use thiserror::Error;
 
@@ -11,7 +10,7 @@ pub struct LsRemote {
     #[arg(long)]
     filter: Option<UserVersion>,
 
-    /// Show only LTS versions (optionally filter by LTS codename)  
+    /// Show only LTS versions (optionally filter by LTS codename)
     #[arg(long)]
     #[expect(
         clippy::option_option,
@@ -26,6 +25,10 @@ pub struct LsRemote {
     /// Only show the latest matching version
     #[arg(long)]
     latest: bool,
+
+    /// Show the latest version of each LTS
+    #[arg(long)]
+    latest_lts: bool,
 }
 
 #[derive(clap::ValueEnum, Clone, Debug, PartialEq)]
@@ -53,15 +56,28 @@ impl super::command::Command for LsRemote {
     fn apply(self, config: &FnmConfig) -> Result<(), Self::Error> {
         let mut all_versions = remote_node_index::list(&config.node_dist_mirror)?;
 
-        if let Some(lts) = &self.lts {
-            match lts {
-                Some(codename) => all_versions.retain(|v| {
-                    v.lts
-                        .as_ref()
-                        .is_some_and(|v_lts| v_lts.eq_ignore_ascii_case(codename))
-                }),
-                None => all_versions.retain(|v| v.lts.is_some()),
-            };
+        if let Some(Some(lts_codename)) = &self.lts {
+            all_versions.retain(|v| {
+                v.lts
+                    .as_ref()
+                    .is_some_and(|v_lts| v_lts.eq_ignore_ascii_case(lts_codename))
+            });
+        } else if self.lts.is_some() || self.latest_lts {
+            all_versions.retain(|v| v.lts.is_some());
+        }
+
+        if self.latest_lts {
+            let mut latest_lts: Vec<IndexedNodeVersion> = Vec::new();
+            let mut iter = all_versions.iter().peekable();
+            while let Some(version) = iter.next() {
+                if let Some(next) = iter.peek() {
+                    if version.lts == next.lts {
+                        continue;
+                    }
+                }
+                latest_lts.push(version.clone());
+            }
+            all_versions = latest_lts;
         }
 
         if let Some(filter) = &self.filter {

diff --git a/src/remote_node_index.rs b/src/remote_node_index.rs
@@ -57,7 +57,7 @@ mod lts_status {
     }
 }
 
-#[derive(Deserialize, Debug)]
+#[derive(Deserialize, Debug, Clone)]
 pub struct IndexedNodeVersion {
     pub version: Version,
     #[serde(with = "lts_status")]