added space-@ to copy the current code line to clipboard of the git remote's viewer

shared/modules/apps/helix.nix

@@ -1,7 +1,64 @@
-{lib, config, ...}:
+{lib, config, pkgs, ...}:
 let
   cfg = config.helixApp;
 
+  # Copies a permalink to the current buffer's line in the remote git viewer
+  # (GitHub/GitLab use /blob/<sha>/, Gitea/Codeberg use /src/commit/<sha>/).
+  # Errors are written to stderr (Helix shows them in the statusline);
+  # clipboard is only written on success.
+  copyRemoteLineLink = pkgs.writeShellApplication {
+    name = "helix-copy-remote-line-link";
+    runtimeInputs = [ pkgs.git pkgs.wl-clipboard pkgs.coreutils ];
+    text = ''
+      set -eu
+      file="''${1:?usage: $0 <file> <line>}"
+      line="''${2:?usage: $0 <file> <line>}"
+
+      # Resolve symlinks so git can find the file in its real repo.
+      file=$(readlink -f -- "$file") \
+        || { echo "could not resolve path: $file" >&2; exit 1; }
+      [ -e "$file" ] || { echo "file does not exist: $file" >&2; exit 1; }
+      dir=$(dirname -- "$file")
+
+      url=$(git -C "$dir" config --get remote.origin.url) \
+        || { echo "not a git repo or no origin remote" >&2; exit 1; }
+      [ -n "$url" ] || { echo "no origin remote" >&2; exit 1; }
+
+      sha=$(git -C "$dir" rev-parse HEAD) \
+        || { echo "could not resolve HEAD" >&2; exit 1; }
+
+      rel=$(git -C "$dir" ls-files --full-name --error-unmatch -- "$file" 2>&1) \
+        || { echo "file not tracked ($file): $rel" >&2; exit 1; }
+
+      # Normalize: strip trailing .git, convert ssh form to https.
+      url="''${url%.git}"
+      case "$url" in
+        *@*:*)
+          userhost="''${url%%:*}"
+          host="''${userhost#*@}"
+          path="''${url#*:}"
+          url="https://$host/$path"
+          ;;
+        ssh://*)
+          rest="''${url#ssh://}"
+          userhost="''${rest%%/*}"
+          host="''${userhost#*@}"
+          path="''${rest#*/}"
+          url="https://$host/$path"
+          ;;
+      esac
+
+      case "$url" in
+        *github.com*|*gitlab.com*) link="$url/blob/$sha/$rel#L$line" ;;
+        *)                         link="$url/src/commit/$sha/$rel#L$line" ;;
+      esac
+
+      printf '%s' "$link" | wl-copy
+
+      echo 'line copied to clipboard :3'
+    '';
+  };
+
   # helix theming docs: https://docs.helix-editor.com/themes.html
   # Check current stylix theme: ~/.config/helix/themes/stylix.toml
   # And computed minimal: ~/.config/helix/themes/minimal.toml
@@ -191,9 +248,8 @@ in
             o = ":config-open";
             h = "hover";
             k = "select_references_to_symbol_under_cursor";
-            # Copy a permalink to the current line in the remote git viewer
-            # (GitHub/GitLab use /blob/<sha>/, Gitea/Codeberg use /src/commit/<sha>/).
-            "@" = ":sh f=%{buffer_name}; l=%{cursor_line}; d=$(dirname \"$f\"); url=$(git -C \"$d\" config --get remote.origin.url) || { echo \"not a git repo or no origin remote\" >&2; exit 1; }; [ -n \"$url\" ] || { echo \"no origin remote\" >&2; exit 1; }; sha=$(git -C \"$d\" rev-parse HEAD) || exit 1; rel=$(git -C \"$d\" ls-files --full-name --error-unmatch -- \"$f\" 2>&1) || { echo \"file not tracked: $rel\" >&2; exit 1; }; command -v wl-copy >/dev/null || { echo \"wl-copy not installed\" >&2; exit 1; }; url=\${url%%.git}; case \"$url\" in git@*) host=\${url#git@}; host=\${host%%:*}; path=\${url#*:}; url=\"https://$host/$path\" ;; esac; case \"$url\" in *github.com*|*gitlab.com*) link=\"$url/blob/$sha/$rel#L$l\" ;; *) link=\"$url/src/commit/$sha/$rel#L$l\" ;; esac; printf '%%s' \"$link\" | wl-copy";
+            # Copy a permalink to the current line in the remote git viewer.
+            "@" = ":sh ${copyRemoteLineLink}/bin/helix-copy-remote-line-link %{buffer_name} %{cursor_line}";
           };
 
           g = {