Simplify variables

config/methods/common_methods.config

@@ -400,28 +400,28 @@ methods {
      * directory.
 
      * Processes can customize the output directory by setting
-     * `process.ext.processlogdir_suffix` (can be a closure).
+     * `process.ext.log_dir` and `process.ext.log_dir_suffix`. Both may be
+     * closures.
      *
      * Inspired by /~https://github.com/nextflow-io/nextflow/issues/1166#issuecomment-502467562
      */
     setup_process_afterscript = {
+        process.ext.log_dir = {
+            "${task.process.replace(':', '/')}"
+        }
+
         process.ext.commonAfterScript = {
             process_log_dir = [
                 "${params.log_output_dir}",
                 "process-log",
-                "${task.process.replace(':', '/')}"
+                "${task.ext.log_dir}${task.ext.log_dir_suffix ?: ''}"
             ].join("/")
 
             // Handle relative paths
             if (process_log_dir.substring(0, 1) != "/") {
                 process_log_dir = "${launchDir}/${process_log_dir}"
             }
 
-            // Allow each process to append a suffix
-            if (task.ext.containsKey("processlogdir_suffix")) {
-                process_log_dir += task.ext.processlogdir_suffix
-            }
-
             return """\
                 mkdir -p "${process_log_dir}"
                 for filename in .command.*; do