From: Ben Harris <bjh21@bjh21.me.uk>
Date: Tue, 7 May 2024 08:14:37 +0000 (+0100)
Subject: 07a trivial CLI that can cd
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~bjharris/git?a=commitdiff_plain;h=52049d278763da0f8d6c33cf6a8019731f35dfe4;p=aoc-2022.git

07a trivial CLI that can cd
---

diff --git a/07/07a.bqn b/07/07a.bqn
new file mode 100644
index 0000000..7d09dca
--- /dev/null
+++ b/07/07a.bqn
@@ -0,0 +1,16 @@
+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}
+}