feat: add nix-index-database

scripts/command-not-found.sh

@@ -0,0 +1,33 @@
+# Adapted from https://github.com/bennofs/nix-index/blob/master/command-not-found.sh
+
+command_not_found_handle () {
+    if [ -n "${MC_SID-}" ] || ! [ -t 1 ]; then
+        >&2 echo "$1: command not found"
+        return 127
+    fi
+
+    echo -n "searching nix-index..."
+    ATTRS=$(@nix-locate@ --minimal --no-group --type x --type s --top-level --whole-name --at-root "/bin/$1")
+
+    case `echo -n "$ATTRS" | grep -c "^"` in
+        0)
+            >&2 echo -ne "$(@tput@ el1)\r"
+            >&2 echo "$1: command not found"
+            ;;
+        *)
+            >&2 echo -ne "$(@tput@ el1)\r"
+            >&2 echo "The program ‘$(@tput@ setaf 4)$1$(@tput@ sgr0)’ is currently not installed."
+            >&2 echo "It is provided by the following derivation(s):"
+            while read ATTR; do
+                ATTR=$(echo "$ATTR" | sed 's|\.out$||') # Strip trailing '.out'
+                >&2 echo "  $(@tput@ setaf 12)nixpkgs#$(@tput@ setaf 4)$ATTR$(@tput@ sgr0)"
+            done <<< "$ATTRS"
+    esac
+
+    return 127
+}
+
+command_not_found_handler () {
+    command_not_found_handle $@
+    return $?
+}