Make pushd change director. Fix issue #697. (#698)

* Make pushd change directory

* Use zen3gr's fix for doctests

src/lib/parser/shell_expand/words/index.rs

@@ -13,7 +13,7 @@ impl Index {
     /// Construct an index using the following convetions:
     /// - A positive value `n` represents `Forward(n)`
     /// - A negative value `-n` reprents `Backwards(n - 1)` such that:
-    /// ```
+    /// ```ignore,rust
     /// assert_eq!(Index::new(-1), Index::Backward(0))
     /// ```
     pub(crate) fn new(input: isize) -> Index {

src/lib/parser/shell_expand/words/range.rs

@@ -48,7 +48,7 @@ impl Range {
     /// Returns the bounds of this range as a tuple containing:
     /// - The starting point of the range
     /// - The length of the range
-    /// ```
+    /// ```ignore,rust
     /// let vec = vec![0, 1, 2, 3, 4, 5, 6, 7, 8];
     /// let range = Range::exclusive(Index::new(1), Index::new(5));
     /// let (start, size) = range.bounds(vec.len()).unwrap();

src/lib/shell/directory_stack.rs

@@ -163,6 +163,7 @@ impl DirectoryStack {
             Action::Push(dir) => {
                 let index = if keep_front { 1 } else { 0 };
                 self.insert_dir(index, dir, variables);
+                self.set_current_dir_by_index(index, "pushd")?;
             }
         };
 

src/lib/types.rs

@@ -21,7 +21,7 @@ pub type HashMapVariableContext = FnvHashMap<Identifier, HashMap>;
 /// Additionally it will call `Into::into` on each of its members so that one
 /// can pass in any type with some `To<SmallString>` implementation; they will
 /// automatically be converted to owned SmallStrings.
-/// ```
+/// ```ignore,rust
 /// let verbose = Array::from_vec(vec!["foo".into(), "bar".into(),
 ///                                    "baz".into(), "zar".into(),
 ///                                    "doz".into()]);