From 3b849a57f2c83086178ca80b995dfd82177af974 Mon Sep 17 00:00:00 2001
From: Tamara Schmitz <tamara.zoe.schmitz@posteo.de>
Date: Sat, 17 Jun 2023 15:10:00 +0200
Subject: [PATCH] ardour: fix default plugin search paths

Since NixOS has different paths for plugins than what Ardour assumes by
default, we should patch these defaults to be correct on NixOS.

While Ardour does indeed respect environment variables such as VST_PATH,
it only does so if a profile configuration was never created. Using this
patch the correct paths are also picked, when the user clicks the "Reset
to Default" button in the path editor.
---
 .../ardour/default-plugin-search-paths.patch  | 55 +++++++++++++++++++
 pkgs/applications/audio/ardour/default.nix    |  1 +
 2 files changed, 56 insertions(+)
 create mode 100644 pkgs/applications/audio/ardour/default-plugin-search-paths.patch

diff --git a/pkgs/applications/audio/ardour/default-plugin-search-paths.patch b/pkgs/applications/audio/ardour/default-plugin-search-paths.patch
new file mode 100644
index 000000000000..8cd3118b9573
--- /dev/null
+++ b/pkgs/applications/audio/ardour/default-plugin-search-paths.patch
@@ -0,0 +1,55 @@
+From 1217722e4bf6c65b5c24da17a7de4bf712ca6775 Mon Sep 17 00:00:00 2001
+From: Tamara Schmitz <tamara.zoe.schmitz@posteo.de>
+Date: Sat, 17 Jun 2023 14:05:53 +0200
+Subject: [PATCH] add NixOS plugin paths as default search paths
+
+Since NixOS uses unusual paths, we should tell Ardour about this. During
+first launch, Ardour does indeed check for environmentals but not when
+you press the "Reset to Defaults" button in the Settings menu. This
+path fixes this by including NixOS paths in the defaults.
+---
+ libs/ardour/plugin_manager.cc | 5 +++--
+ libs/ardour/search_paths.cc   | 4 ++++
+ 2 files changed, 7 insertions(+), 2 deletions(-)
+
+diff --git a/libs/ardour/plugin_manager.cc b/libs/ardour/plugin_manager.cc
+index a572ed55dd..3dd6c2fda6 100644
+--- a/libs/ardour/plugin_manager.cc
++++ b/libs/ardour/plugin_manager.cc
+@@ -305,7 +305,8 @@ PluginManager::PluginManager ()
+ 	if (lxvst_path.length() == 0) {
+ 		lxvst_path = "/usr/local/lib64/lxvst:/usr/local/lib/lxvst:/usr/lib64/lxvst:/usr/lib/lxvst:"
+ 			"/usr/local/lib64/linux_vst:/usr/local/lib/linux_vst:/usr/lib64/linux_vst:/usr/lib/linux_vst:"
+-			"/usr/lib/vst:/usr/local/lib/vst";
++			"/usr/lib/vst:/usr/local/lib/vst:"
++			"$HOME/.lxvst:$HOME/.nix-profile/lib/lxvst:/run/current-system/sw/lib/lxvst:/etc/profiles/per-user/$USER/lib/lxvst";
+ 	}
+ 
+ 	/* first time setup, use 'default' path */
+@@ -2040,7 +2041,7 @@ PluginManager::vst3_refresh (bool cache_only)
+ 	std::string prog = PBD::get_win_special_folder_path (CSIDL_PROGRAM_FILES);
+ 	vst3_discover_from_path (Glib::build_filename (prog, "Common Files", "VST3"), cache_only);
+ #else
+-	vst3_discover_from_path ("~/.vst3:/usr/local/lib/vst3:/usr/lib/vst3", cache_only);
++	vst3_discover_from_path ("~/.vst3:/usr/local/lib/vst3:/usr/lib/vst3:~/.nix-profile/lib/vst3:/run/current-system/sw/lib/vst3:/etc/profiles/per-user/$USER/lib/vst3", cache_only);
+ #endif
+ }
+ 
+diff --git a/libs/ardour/search_paths.cc b/libs/ardour/search_paths.cc
+index e6d8744369..b9774cb006 100644
+--- a/libs/ardour/search_paths.cc
++++ b/libs/ardour/search_paths.cc
+@@ -112,6 +112,10 @@ ladspa_search_path ()
+ 	spath.push_back ("/usr/local/lib/ladspa");
+ 	spath.push_back ("/usr/lib64/ladspa");
+ 	spath.push_back ("/usr/lib/ladspa");
++	spath.push_back ("/run/current-system/sw/lib/ladspa");
++	spath.push_back (path_expand ("$HOME/.ladspa"));
++	spath.push_back (path_expand ("$HOME/.nix-profile/lib/ladspa"));
++	spath.push_back (path_expand ("/etc/profiles/per-user/$USER/lib/ladspa"));
+ #endif
+ 
+ #ifdef __APPLE__
+-- 
+2.40.1
+
diff --git a/pkgs/applications/audio/ardour/default.nix b/pkgs/applications/audio/ardour/default.nix
index b5aa21a5bbec..8ab9ab83d928 100644
--- a/pkgs/applications/audio/ardour/default.nix
+++ b/pkgs/applications/audio/ardour/default.nix
@@ -78,6 +78,7 @@ stdenv.mkDerivation rec {
   patches = [
     # AS=as in the environment causes build failure https://tracker.ardour.org/view.php?id=8096
     ./as-flags.patch
+    ./default-plugin-search-paths.patch
   ];
 
   # Ardour's wscript requires git revision and date to be available.