Nushell Support

README.md

@@ -6,13 +6,22 @@ some limited ability to make the manipulations dynamic.
 
 ![shadowenv in action](https://burkelibbey.s3.amazonaws.com/shadowenv.gif)
 
-In order to use shadowenv, add a line to your shell profile (`.zshrc`, `.bash_profile`, or
-`config.fish`) reading:
+In order to use shadowenv, add initialization to your shell profile:
 
 ```bash
-eval "$(shadowenv init bash)" # for bash
-eval "$(shadowenv init zsh)"  # for zsh
-shadowenv init fish | source  # for fish
+# For bash (.bash_profile)
+eval "$(shadowenv init bash)"
+
+# For zsh (.zshrc)
+eval "$(shadowenv init zsh)"
+
+# For fish (config.fish)
+shadowenv init fish | source
+
+# For nushell - first, generate the initialization script (run this in your terminal):
+shadowenv init nushell | save -f ~/.shadowenv.nu
+# Then add this line to the end of your config file (find it by running $nu.config-path):
+source ~/.shadowenv.nu
 ```
 
 With this code loaded, upon entering a directory containing a `.shadowenv.d` directory,

sh/shadowenv.nu.in

@@ -0,0 +1,43 @@
+def --env __shadowenv_hook [] {
+  mut flags = [--nushell]
+  if ($env.__shadowenv_force_run? | default false) {
+    $flags = [...$flags --force]
+    hide-env __shadowenv_force_run
+  }
+  # Get shadowenv changes as JSON (we can't use `source` dynamically in Nushell)
+  let data = (^@SELF@ hook ...$flags | complete)
+  if $data.exit_code != 0 {
+    return
+  }
+
+  let changes = ($data.stdout | from json)
+
+  # Print activation message if present
+  if $changes.message? != null {
+    print -e $changes.message
+  }
+
+  # Apply environment changes if exported field exists
+  # exported contains vars to set (value) or unset (null)
+  if $changes.exported? != null {
+    for entry in ($changes.exported | transpose key value) {
+      if $entry.value == null {
+        hide-env $entry.key
+      } else if $entry.key == "PATH" {
+        # Convert colon-separated string to list for Nushell's PATH
+        let separator = (if $nu.os-info.name == "windows" { ";" } else { ":" })
+        $env.PATH = ($entry.value | split row $separator)
+      } else {
+        load-env {($entry.key): $entry.value}
+      }
+    }
+  }
+}
+
+$env.config = ($env.config | upsert hooks {|config|
+  $config.hooks | upsert pre_prompt {|hooks|
+    $hooks.pre_prompt | append {|| __shadowenv_hook }
+  }
+})
+
+$env.__shadowenv_force_run = true

src/cli.rs

@@ -78,6 +78,10 @@ pub struct FormatOptions {
     #[arg(long)]
     pub fish: bool,
 
+    /// Format variable assignments for nushell.
+    #[arg(long)]
+    pub nushell: bool,
+
     /// Format variable assignments as JSON.
     #[arg(long)]
     pub json: bool,
@@ -103,6 +107,9 @@ pub enum InitCmd {
 
     /// Prints a script which can be eval'd by fish to set up shadowenv.
     Fish,
+
+    /// Prints a script which can be sourced by nushell to set up shadowenv.
+    Nushell,
 }
 
 /// Options shared by all init subcommands

src/hook.rs

@@ -15,6 +15,7 @@ use std::{borrow::Cow, collections::HashMap, env, path::PathBuf, result::Result,
 
 pub enum VariableOutputMode {
     Fish,
+    Nushell,
     Porcelain,
     Posix,
     Json,
@@ -26,6 +27,8 @@ struct Modifications {
     schema: String,
     exported: HashMap<String, Option<String>>,
     unexported: HashMap<String, Option<String>>, // Legacy. Not used, just shows up empty in json
+    #[serde(skip_serializing_if = "Option::is_none")]
+    message: Option<String>,
 }
 
 impl Modifications {
@@ -34,15 +37,23 @@ impl Modifications {
             schema: "v2".to_string(),
             exported: exports,
             unexported: HashMap::new(),
+            message: None,
         }
     }
+
+    fn with_message(mut self, message: Option<String>) -> Modifications {
+        self.message = message;
+        self
+    }
 }
 
 pub fn run(cmd: HookCmd) -> Result<(), Error> {
     let mode = if cmd.format.porcelain {
         VariableOutputMode::Porcelain
     } else if cmd.format.fish {
         VariableOutputMode::Fish
+    } else if cmd.format.nushell {
+        VariableOutputMode::Nushell
     } else if cmd.format.json {
         VariableOutputMode::Json
     } else if cmd.format.pretty_json {
@@ -219,6 +230,17 @@ pub fn apply_env(shadowenv: &Shadowenv, mode: VariableOutputMode) -> Result<(),
                 shadowenv.features(),
             );
         }
+        VariableOutputMode::Nushell => {
+            // Nushell mode outputs JSON with an activation message
+            // (Nushell can't eval dynamic code like bash, so we use JSON)
+            let message = output::format_activation_message(
+                shadowenv.current_dirs(),
+                shadowenv.prev_dirs(),
+                shadowenv.features(),
+            );
+            let modifs = Modifications::new(shadowenv.exports()?).with_message(message);
+            println!("{}", serde_json::to_string(&modifs).unwrap());
+        }
         VariableOutputMode::Porcelain => {
             // three fields: <operation> : <name> : <value>
             // opcodes: 1: set, unexported (unused)
@@ -386,4 +408,5 @@ mod tests {
             assert_eq!(shell_escape(input), expected, "Failed for input: {}", input);
         }
     }
+
 }

src/init.rs

@@ -21,6 +21,11 @@ pub fn run(cmd: InitCmd) {
             include_bytes!("../sh/shadowenv.fish.in"),
             true, // Fish doesn't use hookbook
         ),
+        Nushell => print_script(
+            pb,
+            include_bytes!("../sh/shadowenv.nu.in"),
+            true, // Nushell doesn't use hookbook
+        ),
     };
 }
 

src/output.rs

@@ -33,17 +33,19 @@ pub fn format_hook_error(err: Error, shellpid: u32, silent: bool) -> Option<Stri
     Some(format!("{} \x1b[1;31mfailure: {}\x1b[0m", SHADOWENV, err))
 }
 
-pub fn print_activation_to_tty(
+pub fn format_activation_message(
     current_dirs: HashSet<PathBuf>,
     prev_dirs: HashSet<PathBuf>,
     features: HashSet<Feature>,
-) {
-    if !should_print_activation() {
-        return;
-    }
+) -> Option<String> {
     let added_dirs: HashSet<PathBuf> = current_dirs.difference(&prev_dirs).cloned().collect();
     let removed_dirs: HashSet<PathBuf> = prev_dirs.difference(&current_dirs).cloned().collect();
 
+    // Don't print message if nothing changed
+    if added_dirs.is_empty() && removed_dirs.is_empty() && features.is_empty() {
+        return None;
+    }
+
     let feature_list = if !features.is_empty() {
         format!(
             " \x1b[1;38;5;245m{}",
@@ -57,12 +59,25 @@ pub fn print_activation_to_tty(
         String::new()
     };
 
-    eprintln!(
+    Some(format!(
         "\x1b[1;34m{}{}{}\x1b[0m",
         SHADOWENV,
         dir_diff(added_dirs, removed_dirs).unwrap_or_default(),
         feature_list
-    );
+    ))
+}
+
+pub fn print_activation_to_tty(
+    current_dirs: HashSet<PathBuf>,
+    prev_dirs: HashSet<PathBuf>,
+    features: HashSet<Feature>,
+) {
+    if !should_print_activation() {
+        return;
+    }
+    if let Some(message) = format_activation_message(current_dirs, prev_dirs, features) {
+        eprintln!("{}", message);
+    }
 }
 
 fn dir_diff(added_dirs: HashSet<PathBuf>, removed_dirs: HashSet<PathBuf>) -> Option<String> {