Refactor

src/core/builtins/cd.rs

@@ -5,26 +5,33 @@
 use crate::ShellCore;
 use super::utils;
 
-pub fn cd(core: &mut ShellCore, args: &mut Vec<String>) -> i32 {
-    if args.len() > 2 {
-        eprintln!("sush: cd: too many arguments");
+fn cd_1arg(core: &mut ShellCore, args: &mut Vec<String>) -> i32 {
+    let var = "~".to_string();
+    args.push(var);
+    set_oldpwd(core);
+    change_directory(core, args)
+}
+
+fn cd_oldpwd(core: &mut ShellCore, args: &mut Vec<String>) -> i32 {
+    if let Some(old) = core.vars.get("OLDPWD") {
+        println!("{}", &old);
+        args[1] = old.to_string();
+    }else {
+        eprintln!("sush: cd: OLDPWD not set");
         return 1;
     }
 
-    if args.len() == 1 { //only "cd"
-        let var = "~".to_string();
-        args.push(var);
-    }else if args.len() == 2 && args[1] == "-" { // cd -
-        if let Some(old) = core.vars.get("OLDPWD") {
-            println!("{}", &old);
-            args[1] = old.to_string();
-        }
-    };
+    set_oldpwd(core);
+    change_directory(core, args)
+}
 
+fn set_oldpwd(core: &mut ShellCore) {
     if let Some(old) = core.get_current_directory().clone() {
         core.vars.insert("OLDPWD".to_string(), old.display().to_string());
     };
+}
 
+fn change_directory(core: &mut ShellCore, args: &mut Vec<String>) -> i32 {
     let path = utils::make_canonical_path(utils::make_absolute_path(core, &args[1]));
     if core.set_current_directory(&path).is_ok() {
         core.vars.insert("PWD".to_string(), path.display().to_string());
@@ -34,3 +41,21 @@ pub fn cd(core: &mut ShellCore, args: &mut Vec<String>) -> i32 {
         1
     }
 }
+
+pub fn cd(core: &mut ShellCore, args: &mut Vec<String>) -> i32 {
+    if args.len() > 2 {
+        eprintln!("sush: cd: too many arguments");
+        return 1;
+    }
+
+    if args.len() == 1 { //only "cd"
+        return cd_1arg(core, args);
+    }
+
+    if args[1] == "-" { // cd -
+        cd_oldpwd(core, args)
+    }else{ // cd /some/dir
+        set_oldpwd(core);
+        change_directory(core, args)
+    }
+}