From 615baa8d74c4dc707e8027eeafe57ffadddd9ebf Mon Sep 17 00:00:00 2001
From: "J. T. Elscott" <78996170+99jte@users.noreply.github.com>
Date: Thu, 13 Mar 2025 10:18:11 -0700
Subject: [PATCH] kdePackages.kio-extras: add a manpage search path for nixos

Add the path /run/current-system/etc/man_db.conf. With my previous commits in this PR, khelpcenter is able to search for manpages because it calls out to man-db, but it doesn't know where to find them when asked to display them.
---
 .../kio-extras/add-nixos-man-db-config-path.patch   | 13 +++++++++++++
 pkgs/kde/gear/kio-extras/default.nix                |  4 ++++
 2 files changed, 17 insertions(+)
 create mode 100644 pkgs/kde/gear/kio-extras/add-nixos-man-db-config-path.patch

diff --git a/pkgs/kde/gear/kio-extras/add-nixos-man-db-config-path.patch b/pkgs/kde/gear/kio-extras/add-nixos-man-db-config-path.patch
new file mode 100644
index 000000000000..275e6121c17f
--- /dev/null
+++ b/pkgs/kde/gear/kio-extras/add-nixos-man-db-config-path.patch
@@ -0,0 +1,13 @@
+diff --git a/man/kio_man.cpp b/man/kio_man.cpp
+index a2fb6dbf5..cb6f373bc 100644
+--- a/man/kio_man.cpp
++++ b/man/kio_man.cpp
+@@ -868,6 +868,8 @@ void MANProtocol::constructPath(QStringList &constr_path, QStringList constr_cat
+         mc.setFileName("/etc/manpath.config"); // SuSE, Debian
+     if (!mc.exists())
+         mc.setFileName("/etc/man.config"); // Mandrake
++    if (!mc.exists())
++        mc.setFileName("/run/current-system/etc/man_db.conf"); // NixOS
+ 
+     if (mc.open(QIODevice::ReadOnly)) {
+         QTextStream is(&mc);
diff --git a/pkgs/kde/gear/kio-extras/default.nix b/pkgs/kde/gear/kio-extras/default.nix
index 2260feeac62c..5bcf4b605069 100644
--- a/pkgs/kde/gear/kio-extras/default.nix
+++ b/pkgs/kde/gear/kio-extras/default.nix
@@ -19,6 +19,10 @@
 mkKdeDerivation {
   pname = "kio-extras";
 
+  patches = [
+    # An upstream merge request is pending for this https://invent.kde.org/network/kio-extras/-/merge_requests/422
+    ./add-nixos-man-db-config-path.patch
+  ];
   extraNativeBuildInputs = [
     pkg-config
     gperf