From efb6ce9e1cd3454fef9fc11648a5f3ba76dd657d Mon Sep 17 00:00:00 2001
From: Ilya Savitsky <ipsavitsky234@gmail.com>
Date: Mon, 15 Jun 2026 22:09:30 +0100
Subject: [PATCH] init: pin Ruby interpreter in shell wrappers

Use `RbConfig.ruby` to embed the absolute path of the
current Ruby interpreter in the generated shell wrappers.
This ensures the wrapper works in environments where
Ruby is not on `$PATH` (such as NixOS).
---
 spec/init_spec.md | 16 +++++++++++-----
 try.rb            |  8 +++++---
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/spec/init_spec.md b/spec/init_spec.md
index 6e61448..4fb3c54 100644
--- a/spec/init_spec.md
+++ b/spec/init_spec.md
@@ -24,7 +24,7 @@ Supported shells:
 ```bash
 try() {
   local out
-  out=$('/path/to/try' exec --path '/default/tries/path' "$@" 2>/dev/tty)
+  out=$('/path/to/ruby' '/path/to/try' exec --path '/default/tries/path' "$@" 2>/dev/tty)
   if [ $? -eq 0 ]; then
     eval "$out"
   else
@@ -35,6 +35,9 @@ try() {
 
 Key elements:
 - Function name: `try`
+- Pins the Ruby interpreter that was used to run `init` (via `RbConfig.ruby`), so the
+  function works even when Ruby is not on `$PATH` (e.g. NixOS, where Ruby only exists
+  inside the `try` package's wrapper)
 - Captures `try exec` output to local variable
 - Redirects stderr to `/dev/tty` (TUI renders to stderr)
 - Exit code 0: Evaluates the output (executes cd, git clone, etc.)
@@ -44,7 +47,7 @@ Key elements:
 
 ```fish
 function try
-  set -l out (/path/to/try exec --path '/default/tries/path' $argv 2>/dev/tty | string collect)
+  set -l out ('/path/to/ruby' '/path/to/try' exec --path '/default/tries/path' $argv 2>/dev/tty | string collect)
   if test $pipestatus[1] -eq 0
     eval $out
   else
@@ -56,10 +59,13 @@ end
 ## Path Embedding
 
 The init output must embed:
-1. The full path to the `try` binary (resolved at init time)
-2. The default tries path (typically `~/src/tries`)
+1. The absolute path to the Ruby interpreter that ran `init` (`RbConfig.ruby`),
+   resolved at init time so the function does not depend on Ruby being in `$PATH`
+2. The full path to the `try` script (resolved at init time)
+3. The default tries path (typically `~/src/tries`)
 
-This ensures the wrapper always calls the correct binary regardless of `$PATH` changes.
+This ensures the wrapper always calls the correct binary and interpreter regardless
+of `$PATH` changes.
 
 ## Installation Instructions
 
diff --git a/try.rb b/try.rb
index d966f80..f4a7b50 100755
--- a/try.rb
+++ b/try.rb
@@ -1263,12 +1263,14 @@ def shell_rc_file(shell)
   end
 
   def init_snippet(shell, script_path, explicit_path, default_path)
+    require 'rbconfig'
+    ruby_bin = RbConfig.ruby
     case shell
     when 'fish'
       fish_path_arg = explicit_path ? " --path '#{explicit_path}'" : " --path (if set -q TRY_PATH; echo \"$TRY_PATH\"; else; echo '#{default_path}'; end)"
       <<~FISH
         function try
-          set -l out (/usr/bin/env ruby '#{script_path}' exec#{fish_path_arg} $argv 2>/dev/tty | string collect)
+          set -l out ('#{ruby_bin}' '#{script_path}' exec#{fish_path_arg} $argv 2>/dev/tty | string collect)
           if test $pipestatus[1] -eq 0
             eval $out
           else
@@ -1286,7 +1288,7 @@ def init_snippet(shell, script_path, explicit_path, default_path)
         function try {
           $tryPath = #{ps_path_expr}
           $tempErr = [System.IO.Path]::GetTempFileName()
-          $out = & ruby '#{script_path}' exec --path $tryPath @args 2>$tempErr
+          $out = & '#{ruby_bin}' '#{script_path}' exec --path $tryPath @args 2>$tempErr
           if ($LASTEXITCODE -eq 0) {
             $out | Invoke-Expression
           } else {
@@ -1301,7 +1303,7 @@ def init_snippet(shell, script_path, explicit_path, default_path)
       <<~SH
         try() {
           local out
-          out=$(/usr/bin/env ruby '#{script_path}' exec#{path_arg} "$@" 2>/dev/tty)
+          out=$('#{ruby_bin}' '#{script_path}' exec#{path_arg} "$@" 2>/dev/tty)
           if [ $? -eq 0 ]; then
             eval "$out"
           else