bc: add arbitrary-precision calculator tools

Formula/bc.rb

@@ -0,0 +1,55 @@
+require (Tap.fetch("automattic", "kandelo-homebrew").path/"Kandelo/formula_support/kandelo_formula_support").to_s
+
+class Bc < Formula
+  include KandeloFormulaSupport
+
+  desc "Arbitrary-precision numeric processing language for Kandelo"
+  homepage "https://www.gnu.org/software/bc/"
+  url "https://ftpmirror.gnu.org/gnu/bc/bc-1.08.2.tar.gz"
+  mirror "https://ftp.gnu.org/gnu/bc/bc-1.08.2.tar.gz"
+  sha256 "ae470fec429775653e042015edc928d07c8c3b2fc59765172a330d3d87785f86"
+  license "GPL-3.0-or-later"
+
+  depends_on "binaryen" => :build
+  depends_on "texinfo" => :build
+  depends_on "wabt" => :build
+
+  skip_clean "bin/bc", "bin/dc"
+
+  def install
+    kandelo_require_arch!("wasm32")
+
+    kandelo_wasm_build do
+      ENV.delete("BC_ENV_ARGS")
+
+      system kandelo_configure, *kandelo_std_configure_args,
+        "--disable-dependency-tracking",
+        "--without-libedit",
+        "--without-readline"
+      system "make", "-j#{ENV.make_jobs}"
+      kandelo_validate_wasm_artifact(buildpath/"bc/bc", fork: :forbidden)
+      kandelo_validate_wasm_artifact(buildpath/"dc/dc", fork: :forbidden)
+      system "make", "install"
+    end
+  end
+
+  test do
+    assert_match(/bc(?:\.wasm)? 1\.08\.2$/,
+      kandelo_run_wasm(bin/"bc", ["--version"]))
+    assert_match(/\Adc(?:\.wasm)? 1\.5\.2 \(GNU bc 1\.08\.2\)$/,
+      kandelo_run_wasm(bin/"dc", ["--version"]))
+
+    source = <<~BC
+      scale=30
+      2^128
+      1/7
+    BC
+    assert_equal <<~EOS, kandelo_run_wasm(bin/"bc", ["-q"], stdin: source)
+      340282366920938463463374607431768211456
+      .142857142857142857142857142857
+    EOS
+
+    assert_equal "dc-child5\n",
+      kandelo_run_wasm(bin/"dc", [], stdin: "!printf dc-child\n2 3 + p\n")
+  end
+end

README.md

@@ -59,6 +59,7 @@ Current migration controls and pilots include:
   Kandelo's musl `catopen` and `catgets` implementation.
 - `ctags`, Universal Ctags' maintained tag generator, `readtags` query client,
   and optscript interpreter with complete C and C++ workflows.
+- `bc`, the GNU arbitrary-precision calculator language and `dc` processor.
 
 The SDK is not yet a Homebrew dependency. Trusted builds supply an
 `HOMEBREW_KANDELO_ROOT` checkout containing the SDK, sysroot, kernel, and Node