rust: add step4_if_fn_do

1 files changed, 19 insertions, 0 deletions

diff --git a/rust/src/printer.rs b/rust/src/printer.rs
index 59821ec..f46b66c 100644
--- a/rust/src/printer.rs
+++ b/rust/src/printer.rs
@@ -1,3 +1,5 @@
+use types::MalVal;
+
 pub fn escape_str(s: &str) -> String {
     let mut escaped = String::new();
     escaped.push('"');
@@ -24,3 +26,20 @@ pub fn unescape_str(s: &str) -> String {
     let re2 = regex!(r#"\n"#);
     re2.replace_all(re1.replace_all(s.as_slice(), "\"").as_slice(), "\n")
 }
+
+pub fn pr_list(lst: &Vec<MalVal>, pr: bool,
+               start: &str , end: &str, join: &str) -> String {
+    let mut first = true;
+    let mut res = String::new();
+    res.push_str(start);
+    for mv in lst.iter() {
+        if first {
+            first = false;
+        } else {
+            res.push_str(join);
+        }
+        res.push_str(mv.pr_str(pr).as_slice());
+    }
+    res.push_str(end);
+    res
+}