update

2 files changed, 23 insertions, 1 deletions

diff --git a/src/libzisp.zig b/src/libzisp.zig
index 400f9fb..4bf8b08 100644
--- a/src/libzisp.zig
+++ b/src/libzisp.zig
@@ -302,3 +302,10 @@ test "parse4" {
     const f, const fl = value.sstr.unpack(value.pair.cdr(val));
     try std.testing.expectEqualStrings("bar", f[0..fl]);
 }
+
+test "unparse" {
+    try std.testing.expectEqualStrings(
+        "#foo",
+        io.unparser.unparse(io.parser.parseCode("#foo")),
+    );
+}
diff --git a/src/libzisp/io/unparser.zig b/src/libzisp/io/unparser.zig
index eb27e20..83186c2 100644
--- a/src/libzisp/io/unparser.zig
+++ b/src/libzisp/io/unparser.zig
@@ -1 +1,16 @@
-// wip
+const std = @import("std");
+
+const value = @import("../value.zig");
+
+const Value = value.Value;
+
+pub fn unparse(v: Value) []u8 {
+    var gpa: std.heap.GeneralPurposeAllocator(.{}) = .init;
+    var out: std.ArrayList(u8) = .init(gpa.allocator());
+    if (value.rune.check(v)) {
+        const name, const len = value.rune.unpack(v);
+        out.append('#') catch @panic("");
+        out.appendSlice(name[0..len]) catch @panic("");
+    }
+    return out.toOwnedSlice() catch @panic("");
+}