Add .node-version file support

Cargo.toml

@@ -11,6 +11,7 @@ path = "src/main.rs"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+async-trait = "0.1.62"
 clap = { version = "4.1.1", features = ["derive"] }
 crossterm = "0.25.0"
 dialoguer = "0.10.3"

src/main.rs

@@ -32,7 +32,7 @@ async fn main() -> Result<()> {
         args::Command::Version => {
             print_version();
             Ok(())
-        },
+        }
         args::Command::Install(v) => install_version(v.version).await,
         args::Command::Default(v) => set_default_version(v.version).await,
         args::Command::Exec(args) => {
@@ -51,7 +51,8 @@ fn print_version() {
     println!("{} v{}", env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION"));
 }
 
-pub async fn install_version(version: NodeVersion) -> Result<()> {
+/// Installs a given node version
+async fn install_version(version: NodeVersion) -> Result<()> {
     if VERSION_FILE_PATH.exists() {
         fs::remove_file(&*VERSION_FILE_PATH)
             .await
@@ -59,14 +60,16 @@ pub async fn install_version(version: NodeVersion) -> Result<()> {
     }
     let repo = get_repository().await?;
 
-    if repo.is_installed(&version)? && !Confirm::new()
+    if repo.is_installed(&version)?
+        && !Confirm::new()
             .with_prompt(format!(
                 "The version {} is already installed. Reinstall?",
                 version.to_string().bold()
             ))
             .default(false)
             .interact()
-            .unwrap() {
+            .unwrap()
+    {
         return Ok(());
     }
     repo.install_version(&version).await?;
@@ -75,7 +78,8 @@ pub async fn install_version(version: NodeVersion) -> Result<()> {
     Ok(())
 }
 
-pub async fn set_default_version(version: NodeVersion) -> Result<()> {
+/// Sets a default system wide node version
+async fn set_default_version(version: NodeVersion) -> Result<()> {
     let mut mapper = get_mapper().await?;
 
     if !mapper.repository().is_installed(&version)?
@@ -96,8 +100,9 @@ pub async fn set_default_version(version: NodeVersion) -> Result<()> {
     Ok(())
 }
 
+/// Exectues a given command
 #[inline]
-pub async fn exec(command: String, args: Vec<OsString>) -> Result<i32> {
+async fn exec(command: String, args: Vec<OsString>) -> Result<i32> {
     let mapper = get_mapper().await?;
     let active_version = mapper.active_version();
 
@@ -109,7 +114,8 @@ pub async fn exec(command: String, args: Vec<OsString>) -> Result<i32> {
     Ok(exit_status.code().unwrap_or(0))
 }
 
-pub async fn refresh() -> Result<()> {
+/// Refreshes the version cache and mapped binaries
+async fn refresh() -> Result<()> {
     get_mapper().await?.remap().await?;
     fs::remove_file(&*VERSION_FILE_PATH)
         .await
@@ -119,7 +125,8 @@ pub async fn refresh() -> Result<()> {
     Ok(())
 }
 
-pub async fn list_versions() -> Result<()> {
+/// Lists all available node versions
+async fn list_versions() -> Result<()> {
     let mapper = get_mapper().await?;
     let versions = mapper.repository().installed_versions().await?;
     let active_version = mapper

src/mapper/mod.rs

@@ -1,4 +1,4 @@
-use std::{env, ffi::OsString, process::ExitStatus, str::FromStr};
+use std::{ffi::OsString, process::ExitStatus};
 
 use tokio::fs;
 
@@ -8,12 +8,16 @@ use crate::{
     repository::{NodeVersion, Repository},
 };
 
-use self::{mapped_command::MappedCommand, mapped_dir::map_node_bin, package_info::PackageInfo};
+use self::{
+    mapped_command::MappedCommand,
+    mapped_dir::map_node_bin,
+    version_detection::{ParallelDetector, VersionDetector},
+};
 use miette::{IntoDiagnostic, Result};
 
 mod mapped_command;
 mod mapped_dir;
-mod package_info;
+mod version_detection;
 
 /// Responsible for mapping to node executables
 /// and managing node versions
@@ -76,19 +80,10 @@ impl Mapper {
     }
 
     async fn get_version() -> Option<NodeVersion> {
-        if let Some(version) = PackageInfo::find()
+        ParallelDetector::detect_version()
             .await
             .ok()
-            .and_then(|i| i)
-            .and_then(|i| i.engines)
-            .and_then(|e| e.node)
-        {
-            Some(NodeVersion::Req(version))
-        } else {
-            env::var("NODE_VERSION")
-                .ok()
-                .and_then(|v| NodeVersion::from_str(&v).ok())
-        }
+            .and_then(|v| v)
     }
 
     /// creates wrapper scripts for the current version

src/mapper/version_detection/env_detector.rs

@@ -0,0 +1,19 @@
+use std::str::FromStr;
+
+use miette::{Context, IntoDiagnostic};
+
+use crate::repository::NodeVersion;
+
+use super::VersionDetector;
+
+pub struct EnvDetector;
+
+#[async_trait::async_trait]
+impl VersionDetector for EnvDetector {
+    async fn detect_version() -> miette::Result<Option<crate::repository::NodeVersion>> {
+        std::env::var("NODE_VERSION")
+            .into_diagnostic()
+            .context("Reading version from environment")
+            .map(|v| NodeVersion::from_str(&v).ok())
+    }
+}

src/mapper/version_detection/mod.rs

@@ -0,0 +1,38 @@
+use async_trait::async_trait;
+
+use futures::future;
+use miette::Result;
+mod env_detector;
+mod package_json_detector;
+mod version_file_detector;
+
+use crate::repository::NodeVersion;
+
+use self::{
+    env_detector::EnvDetector, package_json_detector::PackageJsonDetector,
+    version_file_detector::VersionFileDetector,
+};
+
+#[async_trait]
+pub trait VersionDetector {
+    async fn detect_version() -> Result<Option<NodeVersion>>;
+}
+
+pub struct ParallelDetector;
+
+#[async_trait]
+impl VersionDetector for ParallelDetector {
+    async fn detect_version() -> Result<Option<NodeVersion>> {
+        let version = future::join_all(vec![
+            VersionFileDetector::detect_version(),
+            PackageJsonDetector::detect_version(),
+            EnvDetector::detect_version(),
+        ])
+        .await
+        .into_iter()
+        .filter_map(Result::ok)
+        .find_map(|v| v);
+
+        Ok(version)
+    }
+}

src/mapper/version_detection/package_json_detector.rs

@@ -6,7 +6,11 @@ use serde::{Deserialize, Serialize};
 use serde_json::Value;
 use tokio::fs;
 
-use crate::error::ParseJsonError;
+use crate::{error::ParseJsonError, repository::NodeVersion, utils::find_in_parents};
+
+use super::VersionDetector;
+
+pub struct PackageJsonDetector;
 
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct PackageInfo {
@@ -24,25 +28,25 @@ pub struct EngineInfo {
     other: HashMap<String, Value>,
 }
 
+#[async_trait::async_trait]
+impl VersionDetector for PackageJsonDetector {
+    async fn detect_version() -> Result<Option<crate::repository::NodeVersion>> {
+        Ok(PackageInfo::find()
+            .await?
+            .and_then(|p| p.engines)
+            .and_then(|e| e.node)
+            .map(NodeVersion::Req))
+    }
+}
+
 impl PackageInfo {
     pub async fn find() -> Result<Option<Self>> {
-        let mut dir = std::env::current_dir().into_diagnostic()?;
-        let file_path = dir.join("package.json");
-
-        if file_path.exists() {
-            let info = Self::load(&file_path).await?;
+        let dir = std::env::current_dir().into_diagnostic()?;
 
+        if let Some(path) = find_in_parents(dir, "package.json") {
+            let info = Self::load(&path).await?;
             Ok(Some(info))
         } else {
-            while let Some(parent) = dir.parent() {
-                dir = parent.to_owned();
-                let file_path = dir.join("package.json");
-
-                if file_path.exists() {
-                    let info = Self::load(&file_path).await?;
-                    return Ok(Some(info));
-                }
-            }
             Ok(None)
         }
     }

src/mapper/version_detection/version_file_detector.rs

@@ -0,0 +1,27 @@
+use std::str::FromStr;
+
+use miette::{Context, IntoDiagnostic};
+use tokio::fs;
+
+use crate::{repository::NodeVersion, utils::find_in_parents};
+
+use super::VersionDetector;
+
+pub struct VersionFileDetector;
+
+#[async_trait::async_trait]
+impl VersionDetector for VersionFileDetector {
+    async fn detect_version() -> miette::Result<Option<crate::repository::NodeVersion>> {
+        let dir = std::env::current_dir().into_diagnostic()?;
+
+        if let Some(path) = find_in_parents(dir, ".node-version") {
+            let version_string = fs::read_to_string(path)
+                .await
+                .into_diagnostic()
+                .context("Reading version file.")?;
+            Ok(NodeVersion::from_str(&version_string).ok())
+        } else {
+            Ok(None)
+        }
+    }
+}

src/repository/mod.rs

@@ -46,10 +46,12 @@ impl FromStr for NodeVersion {
             "latest" => Self::Latest,
             "lts" => Self::LatestLts,
             _ => {
-                if let Ok(req) = VersionReq::parse(s) {
+                let version_string = s.trim().trim_start_matches('v');
+
+                if let Ok(req) = VersionReq::parse(version_string) {
                     Self::Req(req)
                 } else {
-                    Self::Lts(s.to_lowercase())
+                    Self::Lts(version_string.to_lowercase())
                 }
             }
         };

src/utils.rs

@@ -1,4 +1,7 @@
-use std::time::Duration;
+use std::{
+    path::{Path, PathBuf},
+    time::Duration,
+};
 
 use indicatif::{ProgressBar, ProgressStyle};
 
@@ -26,3 +29,27 @@ pub fn progress_spinner() -> ProgressBar {
     pb.enable_steady_tick(Duration::from_millis(50));
     pb
 }
+
+pub fn find_in_parents<P: AsRef<Path>>(origin: PathBuf, name: P) -> Option<PathBuf> {
+    for part in dir_parts(origin) {
+        let file = part.join(&name);
+        if file.exists() {
+            return Some(file);
+        }
+    }
+
+    None
+}
+
+/// Returns a list of paths for the current dir up to the very top
+pub fn dir_parts(path: PathBuf) -> Vec<PathBuf> {
+    let mut current: &Path = &path;
+    let mut parts = vec![path.to_owned()];
+
+    while let Some(parent) = current.parent() {
+        current = parent;
+        parts.push(parent.to_owned())
+    }
+
+    parts
+}