From 950daf7fc384606605cafca1617bf12676485bed Mon Sep 17 00:00:00 2001
From: ·𐑑𐑴𐑕𐑑𐑩𐑤
Date: Tue, 23 Dec 2025 06:22:23 +0000
Subject: mark-darcs-weak-hash: move to Nix

---
 README.rst                           |  7 +++----
 nix/overlay/development.nix          |  2 ++
 nix/package/dev-shell.nix            |  2 ++
 nix/package/mark-darcs-weak-hash.nix | 26 ++++++++++++++++++++++++++
 script/mk-darcs-weak-hash            |  4 ----
 5 files changed, 33 insertions(+), 8 deletions(-)
 create mode 100644 nix/package/mark-darcs-weak-hash.nix
 delete mode 100644 script/mk-darcs-weak-hash

diff --git a/README.rst b/README.rst
index b8c2062..334e138 100644
--- a/README.rst
+++ b/README.rst
@@ -206,14 +206,13 @@ Darcs hooks (can skip)
 
 .. code:: console
 
-   $ chmod +x script/mk-darcs-weak-hash
    $ $EDITOR _darcs/prefs/defaults
 
 .. code::
 
-	apply posthook script/mk-darcs-weak-hash && nix-build --no-out-link release.nix
-	obliterate posthook script/mk-darcs-weak-hash
-	record posthook script/mk-darcs-weak-hash
+	apply posthook nix-shell --run mk-darcs-weak-hash && nix-build --no-out-link release.nix
+	obliterate posthook nix-shell --run mk-darcs-weak-hash
+	record posthook nix-shell --run mk-darcs-weak-hash
 
 Hooks here can:
 	• Build the entire project before applying patches to make sure it works.
diff --git a/nix/overlay/development.nix b/nix/overlay/development.nix
index b414597..c956556 100644
--- a/nix/overlay/development.nix
+++ b/nix/overlay/development.nix
@@ -7,6 +7,8 @@ final: prev: {
       final': prev': {
          dev-shell = final'.callPackage ../package/dev-shell.nix { };
 
+         mark-darcs-weak-hash = final'.callPackage ../package/mark-darcs-weak-hash.nix { };
+
          nixfmt-3-space = final'.callPackage ../package/nixfmt-3-space.nix { };
 
          ocamlformat-rpc-bin = final'.callPackage ../package/ocamlformat-rpc-bin.nix { };
diff --git a/nix/package/dev-shell.nix b/nix/package/dev-shell.nix
index 77a9ac1..3cfec5c 100644
--- a/nix/package/dev-shell.nix
+++ b/nix/package/dev-shell.nix
@@ -7,6 +7,7 @@
    kdlfmt,
    topiary,
    ocamlPackages,
+   mark-darcs-weak-hash,
    nixtamal,
    nixfmt-3-space,
    ocamlformat-rpc-bin,
@@ -19,6 +20,7 @@ mkShell {
    ];
    packages = [
       kdlfmt
+      mark-darcs-weak-hash
       nixfmt-3-space
       topiary
 
diff --git a/nix/package/mark-darcs-weak-hash.nix b/nix/package/mark-darcs-weak-hash.nix
new file mode 100644
index 0000000..7f644e1
--- /dev/null
+++ b/nix/package/mark-darcs-weak-hash.nix
@@ -0,0 +1,26 @@
+#──────────────────────────────────────────────────────────────────────────────┐
+# SPDX-FileCopyrightText: 2025 toastal <https://toast.al/contact/>             │
+# SPDX-License-Identifier: LGPL-2.1-or-later                                   │
+#──────────────────────────────────────────────────────────────────────────────┘
+{
+   lib,
+   writeDashBinScript,
+   darcs,
+   gawk,
+}:
+
+let
+   path = lib.makeBinPath [
+      darcs
+      gawk
+   ];
+in
+writeDashBinScript {
+   name = "mark-darcs-weak-hash";
+   text = /* sh */ ''
+      export PATH="${path}:$PATH"
+
+      darcs show repo \
+         | awk '/^[[:space:]]*Weak Hash:/ { sub(/^[[:space:]]*Weak Hash:[[:space:]]*/, "", $0); printf $0 }' > "$PWD/_darcs/weak_hash"
+   '';
+}
diff --git a/script/mk-darcs-weak-hash b/script/mk-darcs-weak-hash
deleted file mode 100644
index 0836354..0000000
--- a/script/mk-darcs-weak-hash
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/usr/bin/env dash
-base_dir=$(cd -- "$(dirname -- "$0")/.." && pwd)
-darcs show repo \
-	| awk '/^[[:space:]]*Weak Hash:/ { sub(/^[[:space:]]*Weak Hash:[[:space:]]*/, "", $0); printf $0 }' > "$base_dir/_darcs/weak_hash"
-- 
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