Improve mapping and add refresh command for env

Cargo.toml

@@ -18,6 +18,7 @@ color-eyre = "0.6.2"
 crossterm = "0.25.0"
 dialoguer = "0.10.3"
 dirs = "4.0.0"
+futures = "0.3.25"
 futures-util = "0.3.25"
 indicatif = "0.17.3"
 lazy_static = "1.4.0"
@@ -26,6 +27,7 @@ miette = "5.5.0"
 reqwest = { version = "0.11.14", features = ["json", "stream"] }
 semver = { version = "1.0.16", features = ["std", "serde"] }
 serde = { version = "1.0.152", features = ["derive"] }
+serde_json = "1.0.91"
 set_env = "1.3.4"
 tar = "0.4.38"
 thiserror = "1.0.38"

src/args.rs

@@ -12,34 +12,46 @@ pub struct Args {
 
 #[derive(Clone, Debug, Subcommand)]
 pub enum Command {
+    /// Returns the nenv version
+    #[command(short_flag = 'v', aliases = &["--version"])]
+    Version,
+
+    /// Installs the given node version
     #[command()]
     Install(InstallArgs),
 
+    /// Sets the specified version as the global default
     #[command()]
-    Use(UseArgs),
+    Default(DefaultArgs),
 
-    #[command(short_flag = 'v', aliases = &["--version"])]
-    Version,
+    /// Refreshes the node environment mappings and cache
+    #[command()]
+    Refresh,
 
+    /// Executes the given version specific  node executable
     #[command()]
     Exec(ExecArgs),
 }
 
 #[derive(Clone, Debug, Parser)]
 pub struct ExecArgs {
+    /// The command to execute
     #[arg()]
     pub command: String,
+
+    /// The arguments for the command
     #[arg(trailing_var_arg = true, allow_hyphen_values = true)]
     pub args: Vec<OsString>,
 }
 
 #[derive(Clone, Debug, Parser)]
 pub struct InstallArgs {
+    /// the version to install
     pub version: NodeVersion,
 }
 
 #[derive(Clone, Debug, Parser)]
-pub struct UseArgs {
-    #[arg()]
+pub struct DefaultArgs {
+    /// The version to set as default
     pub version: NodeVersion,
 }

src/consts.rs

@@ -14,6 +14,7 @@ lazy_static! {
         .unwrap_or_else(|| PathBuf::from(".cache"))
         .join(PathBuf::from("nenv"));
     pub static ref CFG_FILE_PATH: PathBuf = CFG_DIR.join("config.toml");
+    pub static ref VERSION_FILE_PATH: PathBuf = DATA_DIR.join("versions.json");
     pub static ref BIN_DIR: PathBuf = DATA_DIR.join("bin");
     pub static ref NODE_VERSIONS_DIR: PathBuf = DATA_DIR.join("versions");
     pub static ref NODE_ARCHIVE_SUFFIX: String = format!("-{OS}-{ARCH}.{ARCHIVE_TYPE}");

src/error.rs

@@ -44,6 +44,8 @@ pub enum Error {
         #[diagnostic_source]
         MapperError,
     ),
+    #[error("Failed to work with json: {0}")]
+    Json(#[from] serde_json::Error),
 
     #[error("IO Error: {0}")]
     Io(#[from] io::Error),

src/lib.rs

@@ -1,5 +1,6 @@
 use std::ffi::OsString;
 
+use consts::{DATA_DIR, VERSION_FILE_PATH};
 use crossterm::style::Stylize;
 use mapper::Mapper;
 use repository::{config::Config, NodeVersion, Repository};
@@ -12,8 +13,10 @@ mod utils;
 mod web_api;
 use dialoguer::Confirm;
 use error::Result;
+use tokio::fs;
 
 pub async fn install_version(version: NodeVersion) -> Result<()> {
+    fs::remove_file(&*VERSION_FILE_PATH).await?;
     let repo = get_repository().await?;
 
     if repo.is_installed(&version).await? {
@@ -32,7 +35,7 @@ pub async fn install_version(version: NodeVersion) -> Result<()> {
     Ok(())
 }
 
-pub async fn use_version(version: NodeVersion) -> Result<()> {
+pub async fn set_default_version(version: NodeVersion) -> Result<()> {
     let mut mapper = get_mapper().await?;
 
     if !mapper.repository().is_installed(&version).await?
@@ -47,7 +50,7 @@ pub async fn use_version(version: NodeVersion) -> Result<()> {
         mapper.repository().install_version(&version).await?;
     }
 
-    mapper.use_version(&version).await?;
+    mapper.set_default_version(&version).await?;
     println!("Now using {}", version.to_string().bold());
 
     Ok(())
@@ -65,6 +68,13 @@ pub async fn exec(command: String, args: Vec<OsString>) -> Result<i32> {
     Ok(exit_status.code().unwrap_or(0))
 }
 
+pub async fn refresh() -> Result<()> {
+    get_mapper().await?.remap().await?;
+    fs::remove_file(&*VERSION_FILE_PATH).await?;
+
+    Ok(())
+}
+
 async fn get_repository() -> Result<Repository> {
     Repository::init(Config::load().await?).await
 }

src/main.rs

@@ -6,18 +6,20 @@ use clap::Parser;
 mod args;
 
 #[tokio::main(flavor = "current_thread")]
-async fn main() {
+async fn main() -> nenv::error::Result<()> {
     color_eyre::install().unwrap();
     let args: Args = Args::parse();
     match args.commmand {
-        args::Command::Install(v) => nenv::install_version(v.version).await.unwrap(),
-        args::Command::Use(v) => nenv::use_version(v.version).await.unwrap(),
-        args::Command::Version => print_version(),
+        args::Command::Version => Ok(print_version()),
+        args::Command::Install(v) => nenv::install_version(v.version).await,
+        args::Command::Default(v) => nenv::set_default_version(v.version).await,
         args::Command::Exec(args) => {
-            let exit_code = nenv::exec(args.command, args.args).await.unwrap();
+            let exit_code = nenv::exec(args.command, args.args).await?;
+
             process::exit(exit_code);
         }
-    };
+        args::Command::Refresh => nenv::refresh().await,
+    }
 }
 
 fn print_version() {

src/mapper/mapped_dir.rs

@@ -11,43 +11,31 @@ use super::error::MapperResult;
 
 struct NodeApp {
     info: DirEntry,
+    name: String,
 }
 
 impl NodeApp {
     pub fn new(info: DirEntry) -> Self {
-        Self { info }
-    }
+        let path = info.path();
+        let name = path.file_stem().unwrap();
+        let name = name.to_string_lossy().into_owned();
 
-    /// returns the name of the application
-    pub fn name(&self) -> String {
-        let name = self.info.file_name();
-        name.to_string_lossy().into_owned()
+        Self { info, name }
     }
 
-    pub async fn unmap(&self) -> MapperResult<()> {
-        fs::remove_file(self.info.path()).await?;
-
-        Ok(())
+    pub fn name(&self) -> &String {
+        &self.name
     }
 
     /// creates wrappers to map this application
     pub async fn map_executable(&self) -> MapperResult<()> {
         let src_path = BIN_DIR.join(self.info.file_name());
-        let name = self.info.file_name();
-        let name = name.to_string_lossy();
-        self.write_wrapper_script(&name, &src_path).await
+        self.write_wrapper_script(&src_path).await
     }
 
     #[cfg(not(target_os = "windows"))]
-    async fn write_wrapper_script(&self, name: &str, path: &Path) -> MapperResult<()> {
-        fs::write(
-            path,
-            format!(
-                r#"#!/bin/sh
-                nenv exec {name} "$@""#
-            ),
-        )
-        .await?;
+    async fn write_wrapper_script(&self, path: &Path) -> MapperResult<()> {
+        fs::write(path, format!("#!/bin/sh\nnenv exec {} \"$@\"", self.name)).await?;
         let src_metadata = self.info.metadata().await?;
         fs::set_permissions(&path, src_metadata.permissions()).await?;
 
@@ -55,8 +43,13 @@ impl NodeApp {
     }
 
     #[cfg(target_os = "windows")]
-    async fn write_wrapper_script(&self, name: &str, path: &Path) -> MapperResult<()> {
-        fs::write(path, format!("nenv exec {name} %*")).await?;
+    async fn write_wrapper_script(&self, path: &Path) -> MapperResult<()> {
+        fs::write(
+            path.with_extension("bat"),
+            format!("nenv exec {} %*", self.name),
+        )
+        .await?;
+        let src_metadata = self.info.metadata().await?;
         fs::set_permissions(&path, src_metadata.permissions()).await?;
 
         Ok(())
@@ -64,19 +57,17 @@ impl NodeApp {
 }
 
 pub async fn map_node_bin(node_path: NodePath) -> MapperResult<()> {
-    let applications = get_applications(&node_path.bin()).await?;
-    let mapped_applications = get_applications(&*BIN_DIR).await?;
-    let mut new_mapped = HashSet::new();
+    let mapped_app_names = get_applications(&*BIN_DIR)
+        .await?
+        .iter()
+        .map(NodeApp::name)
+        .cloned()
+        .collect::<HashSet<_>>();
 
-    for application in applications {
-        application.map_executable().await?;
-        new_mapped.insert(application.name());
-    }
-    for app in mapped_applications {
-        if !new_mapped.contains(&app.name()) {
-            app.unmap().await?;
-        }
-    }
+    let mut applications = get_applications(&node_path.bin()).await?;
+    applications.retain(|app| !mapped_app_names.contains(app.name()));
+
+    futures::future::join_all(applications.iter().map(NodeApp::map_executable)).await;
 
     Ok(())
 }

src/mapper/mod.rs

@@ -1,6 +1,9 @@
 use std::{env, ffi::OsString, process::ExitStatus, str::FromStr};
 
+use tokio::fs;
+
 use crate::{
+    consts::BIN_DIR,
     error::LibResult,
     repository::{NodeVersion, Repository},
 };
@@ -32,7 +35,7 @@ impl Mapper {
     }
 
     /// Sets the given version as the default one
-    pub async fn use_version(&mut self, version: &NodeVersion) -> LibResult<()> {
+    pub async fn set_default_version(&mut self, version: &NodeVersion) -> LibResult<()> {
         self.repo
             .config
             .set_default_version(version.clone())
@@ -60,10 +63,20 @@ impl Mapper {
             .run()
             .await
             .map_err(MapperError::from)?;
+        self.map_active_version().await?;
 
         Ok(exit_status)
     }
 
+    /// Recreates all environment mappings
+    pub async fn remap(&self) -> LibResult<()> {
+        fs::remove_dir_all(&*BIN_DIR).await?;
+        fs::create_dir_all(&*BIN_DIR).await?;
+        self.map_active_version().await?;
+
+        Ok(())
+    }
+
     fn get_version() -> Option<NodeVersion> {
         env::var("NODE_VERSION")
             .ok()

src/repository/mod.rs

@@ -90,12 +90,20 @@ impl Repository {
     pub async fn init(config: Config) -> LibResult<Self> {
         Self::create_folders().await?;
         let web_api = WebApi::new(&config.dist_base_url);
-        let all_versions = web_api.get_versions().await?;
+
+        let versions = if let Some(v) = Versions::load().await {
+            v
+        } else {
+            let all_versions = web_api.get_versions().await?;
+            let v = Versions::new(all_versions);
+            v.save().await?;
+            v
+        };
 
         Ok(Self {
             config,
             web_api,
-            versions: Versions::new(all_versions),
+            versions,
         })
     }
 

src/repository/versions.rs

@@ -1,15 +1,29 @@
 use std::collections::HashMap;
 
 use semver::{Version, VersionReq};
+use serde::{Deserialize, Serialize};
+use tokio::fs;
 
-use crate::web_api::VersionInfo;
+use crate::{consts::VERSION_FILE_PATH, error::LibResult, web_api::VersionInfo};
 
+#[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct Versions {
     lts_versions: HashMap<String, VersionReq>,
     versions: HashMap<Version, VersionInfo>,
 }
 
 impl Versions {
+    /// Loads the versions from the cached versions.json file
+    pub(crate) async fn load() -> Option<Self> {
+        if !VERSION_FILE_PATH.exists() {
+            return None;
+        }
+        let versions_string = fs::read_to_string(&*VERSION_FILE_PATH).await.ok()?;
+        let versions = serde_json::from_str(&versions_string).ok()?;
+
+        Some(versions)
+    }
+
     /// creates a new instance to access version information
     pub fn new(all_versions: Vec<VersionInfo>) -> Self {
         let lts_versions = all_versions
@@ -32,6 +46,13 @@ impl Versions {
         }
     }
 
+    pub(crate) async fn save(&self) -> LibResult<()> {
+        let json_string = serde_json::to_string(&self)?;
+        fs::write(&*VERSION_FILE_PATH, json_string).await?;
+
+        Ok(())
+    }
+
     /// Returns the latest known node version
     pub fn latest(&self) -> &VersionInfo {
         let mut versions = self.versions.keys().collect::<Vec<_>>();

src/web_api/model.rs

@@ -1,10 +1,10 @@
 use std::borrow::Cow;
 
-use serde::{Deserialize, Deserializer};
+use serde::{Deserialize, Deserializer, Serialize};
 
 /// Represents a single nodejs version info entry
 /// as retrieved from nodejs.org
-#[derive(Clone, Debug, Deserialize)]
+#[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct VersionInfo {
     #[serde(deserialize_with = "deserialize_prefixed_version")]
     pub version: semver::Version,
@@ -19,7 +19,7 @@ pub struct VersionInfo {
     pub files: Vec<String>,
 }
 
-#[derive(Clone, Debug, Deserialize)]
+#[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct ModuleVersions {
     pub v8: String,
     pub npm: Option<String>,