Added --export-directives option to build mode to export component's

directives in JSON format to standard output.

Author: ODiogoSilva

changelog.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## Changes in upcoming release (dev branch) 
+## Changes in upcoming release (`dev` branch) 
 
 ### Components changes
 
@@ -10,6 +10,10 @@ Updated images for components `mash_dist`, `mash_screen` and
 ### New components
 - Added component `fast_ani`.
 
+### Minor/Other changes
+
+- Added `--export-directives` option to `build` mode to export component's 
+directives in JSON format to standard output.
 
 ## 1.3.0
 

flowcraft/flowcraft.py

@@ -97,6 +97,12 @@ def get_args(args=None):
                          "components (via -t option) in JSON format to stdout. "
                          "No pipeline will be generated with this option."
     )
+    build_parser.add_argument(
+        "--export-directives", dest="export_directives", action="store_const",
+        const=True, help="Only export the directives for the provided "
+                         "components (via -t option) in JSON format to stdout. "
+                         "No pipeline will be generated with this option."
+    )
 
     # GENERAL OPTIONS
     parser.add_argument(
@@ -177,7 +183,7 @@ def validate_build_arguments(args):
 
     # Skill all checks when exporting parameters AND providing at least one
     # component
-    if args.export_params:
+    if args.export_params or args.export_directives:
         # Check if components provided
         if not args.tasks:
             logger.error(colored_print(
@@ -266,8 +272,9 @@ def copy_project(path):
 
 def build(args):
 
-    # Disable standard logging for stdout when the following modes are executed:
-    if args.export_params:
+    # Disable standard logging for stdout when the following modes are
+    #  executed:
+    if args.export_params or args.export_directives:
         logger.setLevel(logging.ERROR)
 
     welcome = [
@@ -330,6 +337,9 @@ def build(args):
     if args.export_params:
         nfg.export_params()
         sys.exit(0)
+    elif args.export_directives:
+        nfg.export_directives()
+        sys.exit(0)
     else:
         # building the actual pipeline nf file
         nfg.build()

flowcraft/generator/engine.py

@@ -1506,6 +1506,19 @@ def export_params(self):
         # Flush params json to stdout
         sys.stdout.write(json.dumps(params_json))
 
+    def export_directives(self):
+        """Export pipeline directives as a JSON to stdout
+        """
+
+        directives_json = {}
+
+        # Skip first init process
+        for p in self.processes[1:]:
+            directives_json[p.template] = p.directives
+
+        # Flush params json to stdout
+        sys.stdout.write(json.dumps(directives_json))
+
     def build(self):
         """Main pipeline builder