feat: wrapper for pg_dump

package/postgres/pg_wdump.nix

@@ -0,0 +1,33 @@
+# Wrapper for pg_dump with url option
+{ writeShellScriptBin, postgresql, ... }:
+writeShellScriptBin "wpg_dupmall" /* */ ''
+#!/bin/sh
+
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --url=*)
+      url="''${1#--url=}"
+      shift
+      ;;
+    --url)
+      url="$2"
+      shift 2
+      ;;
+    *)
+      args="$args $1"
+      shift
+      ;;
+  esac
+done
+
+if [ -n "$url" ]; then
+  user=$(echo "$url" | sed -E 's|.*://([^:]+):.*@.*|\1|')
+  pass=$(echo "$url" | sed -E 's|.*://[^:]+:([^@]+)@.*|\1|')
+  host=$(echo "$url" | sed -E 's|.*@([^:/]+):.*|\1|')
+  port=$(echo "$url" | sed -E 's|.*:([0-9]+)/?.*|\1|')
+  export PGPASSWORD="$pass"
+  exec ${postgresql}/bin/pg_dump -h "$host" -p "$port" -U "$user" $args
+else
+  exec ${postgresql}/bin/pg_dump $args
+fi
+''