Added hashbang to output

src/cli.rs

@@ -18,9 +18,9 @@ pub struct Cli {
     #[clap(short, long, arg_enum, value_parser)]
     pub format: Format,
 
-    /// Sets a custom config file
-    #[clap(short, long, value_parser, value_name = "CONFIG")]
-    pub config: Option<PathBuf>,
+    /// The path of the shell to use in the hashbang
+    #[clap(short, long, value_parser)]
+    pub shell_path: Option<PathBuf>,
 
     /// Print extra information
     #[clap(short, long, action)]

src/env.rs

@@ -5,6 +5,7 @@ use std::collections::HashMap;
 pub struct Env {
     #[serde(alias = "env-vars")]
     env_vars: HashMap<String, Vec<String>>,
+    // TODO add aliases
 }
 
 impl Env {

src/main.rs

@@ -9,6 +9,7 @@ use format::*;
 use std::fs;
 use env::Env;
 use std::io::Write;
+use std::path::PathBuf;
 
 fn main() {
     let cli = Cli::parse();
@@ -52,10 +53,23 @@ fn main() {
         Format::Fish => data.to_fish(),
         Format::Tcsh => data.to_tcsh(),
     };
-    vprintln!(v, "Output:\n{}", output);
+
+    // create new output file, clear if already exists
+    let mut output_file = fs::File::create(output_name).unwrap();
+
+    // add hashbang
+    // TODO do it more safely
+    let shell_path: PathBuf = match cli.shell_path {
+        Some(shell) => shell,
+        None => match cli.format {
+            Format::Sh => PathBuf::from("/usr/bin/sh"),
+            Format::Fish => PathBuf::from("/usr/bin/fish"),
+            Format::Tcsh => PathBuf::from("/usr/bin/tcsh"),
+        }
+    };
+    output_file.write_all(vec!["#!", shell_path.to_str().unwrap()].join("").as_bytes()).unwrap();
 
     // write output to file
     // TODO do it more safely
-    let mut output_file = fs::File::create(output_name).unwrap();
     output_file.write_all(output.as_bytes()).unwrap();
 }