From b250a6b1b30ceea86bf66b11de8a068fd1d6086b Mon Sep 17 00:00:00 2001
From: oddlama <oddlama@oddlama.org>
Date: Tue, 11 Apr 2023 17:50:19 +0200
Subject: [PATCH] feat(apps): add wireguard peer selection for use with qr code
 generation later

---
 modules/wireguard.nix          |  2 +-
 nix/apps/default.nix           |  1 +
 nix/apps/show-wireguard-qr.nix | 22 ++++++++++++++++++----
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/modules/wireguard.nix b/modules/wireguard.nix
index 7cbc617..2277a18 100644
--- a/modules/wireguard.nix
+++ b/modules/wireguard.nix
@@ -174,7 +174,7 @@ in {
   in {
     assertions =
       concatMap (netCfg: let
-        inherit netCfg wgName;
+        inherit (netCfg) wgName;
         externalPeers = concatMap (n: attrNames nodes.${n}.config.extra.wireguard.networks.${wgName}.externalPeers) netCfg.nodesWithThisNetwork;
         duplicatePeers = duplicates externalPeers;
         usedAddresses =
diff --git a/nix/apps/default.nix b/nix/apps/default.nix
index d455011..1834ffb 100644
--- a/nix/apps/default.nix
+++ b/nix/apps/default.nix
@@ -15,6 +15,7 @@
     ./format-secrets.nix
     ./generate-initrd-keys.nix
     ./generate-wireguard-keys.nix
+    ./show-wireguard-qr.nix
   ];
 in
   builtins.listToAttrs (map (appPath: nameValuePair (removeSuffix ".nix" (builtins.baseNameOf appPath)) (mkApp (import appPath args))) apps)
diff --git a/nix/apps/show-wireguard-qr.nix b/nix/apps/show-wireguard-qr.nix
index 4b2d41f..8db21df 100644
--- a/nix/apps/show-wireguard-qr.nix
+++ b/nix/apps/show-wireguard-qr.nix
@@ -3,10 +3,24 @@
   pkgs,
   ...
 }: let
-  inherit (pkgs.lib) escapeShellArg;
+  inherit
+    (pkgs.lib)
+    attrNames
+    concatMap
+    concatStringsSep
+    escapeShellArg
+    filter
+    unique
+    ;
+
+  nodeNames = attrNames self.nodes;
+  nodesWithNet = net: filter (n: builtins.hasAttr net self.nodes.${n}.config.extra.wireguard.networks) nodeNames;
+  wireguardNetworks = unique (concatMap (n: attrNames self.nodes.${n}.config.extra.wireguard.networks) nodeNames);
+  externalPeersForNet = net: concatMap (n: attrNames self.nodes.${n}.config.extra.wireguard.networks.${net}.externalPeers) (nodesWithNet net);
+  externalPeers = concatMap (net: map (peer: {inherit net peer;}) (externalPeersForNet net)) wireguardNetworks;
 in
-  # TODO fzf selection of all external peers pls
-  pkgs.writeShellScript "generate-wireguard-keys" ''
+  # TODO generate "classic" config and run qrencode
+  pkgs.writeShellScript "show-wireguard-qr" ''
     set -euo pipefail
-    echo TODO
+    echo ${concatStringsSep " " (map (x: "${x.net}.${x.peer}") externalPeers)} | fzf
   ''