07a trivial CLI that can cd

diff --git a/07/07a.bqn b/07/07a.bqn
new file mode 100644 (file)
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+++ b/07/07a.bqn
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+Split←{
+  blocknums ← +`𝕨
+  # Set entries in blocknums to -1 when they correspond with delimiters.
+  blocknums ↩ (¯1¨)⌾(𝕨⊸/) blocknums
+  blocknums⊔𝕩
+}
+
+FS←{𝕤
+  cwd←⟨⟩
+  Exec⇐{
+    𝕊⟨"cd", "/"⟩:  cwd↩⟨⟩;
+    𝕊⟨"cd", ".."⟩: cwd 1⊸↓↩;
+    𝕊⟨"cd", dir⟩:  cwd ⟨dir⟩⊸∾↩
+  }
+  Cmd⇐{Exec (' '=𝕩)Split𝕩}
+}