1 files changed, 79 insertions, 0 deletions
diff --git a/vere/pkg/noun/jets/f/fork.c b/vere/pkg/noun/jets/f/fork.c
new file mode 100644
index 0000000..b2a68eb
--- /dev/null
+++ b/vere/pkg/noun/jets/f/fork.c
@@ -0,0 +1,79 @@
+/// @file
+
+#include "jets/k.h"
+#include "jets/q.h"
+#include "jets/w.h"
+
+#include "noun.h"
+
+
+  u3_noun
+  u3qf_forq(u3_noun hoz,
+            u3_noun bur)
+  {
+    if ( c3y == u3r_sing(hoz, bur) ) {
+      return u3k(hoz);
+    }
+    else if ( c3__void == bur ) {
+      return u3k(hoz);
+    }
+    else if ( c3__void == hoz ) {
+      return u3k(bur);
+    }
+    else return u3kf_fork(u3nt(u3k(hoz), u3k(bur), u3_nul));
+  }
+
+  u3_noun
+  u3qf_fork(u3_noun yed)
+  {
+    u3_noun lez = u3_nul;
+
+    while ( u3_nul != yed ) {
+      u3_noun i_yed = u3h(yed);
+
+      if ( c3__void != i_yed ) {
+        if ( (c3y == u3du(i_yed)) && (c3__fork == u3h(i_yed)) ) {
+          lez = u3kdi_uni(lez, u3k(u3t(i_yed)));
+        }
+        else {
+          lez = u3kdi_put(lez, u3k(i_yed));
+        }
+      }
+
+      yed = u3t(yed);
+    }
+
+    if ( u3_nul == lez ) {
+      return c3__void;
+    }
+    else if ( (u3_nul == u3h(u3t(lez))) && (u3_nul == u3t(u3t(lez))) ) {
+      u3_noun ret = u3k(u3h(lez));
+
+      u3z(lez);
+      return ret;
+    }
+    else {
+      return u3nc(c3__fork, lez);
+    }
+  }
+
+  u3_noun
+  u3wf_fork(u3_noun cor)
+  {
+    u3_noun yed;
+
+    if ( c3n == u3r_mean(cor, u3x_sam, &yed, 0) ) {
+      return u3m_bail(c3__fail);
+    } else {
+      return u3qf_fork(yed);
+    }
+  }
+
+  u3_noun
+  u3kf_fork(u3_noun yed)
+  {
+    u3_noun ret = u3qf_fork(yed);
+
+    u3z(yed);
+    return ret;
+  }