[diffoscope] 01/02: {config, main}: adds check_parallel on init

[Juliana Oliveira]

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jwnx-guest pushed a commit to branch jwnx_parallel_diffoscope
in repository diffoscope.

commit 613d4f9576a10477c7f59cd2a94ea0090c0f1b57
Author: Juliana Oliveira <juliana.orod at gmail.com>
Date:   Mon Mar 5 19:19:47 2018 -0300

    {config, main}: adds check_parallel on init
    
    Checks if dill and multiprocess are importable. If they aren't,
    Config().parallel flag will be set to false.
    
    Signed-off-by: Juliana Oliveira <juliana.orod at gmail.com>
---
 diffoscope/config.py | 6 ++++++
 diffoscope/main.py   | 1 +
 2 files changed, 7 insertions(+)

diff --git a/diffoscope/config.py b/diffoscope/config.py
index ff07695..9b57a04 100644
--- a/diffoscope/config.py
+++ b/diffoscope/config.py
@@ -89,3 +89,9 @@ class Config(object):
         self.check_ge("max_diff_block_lines", "max_page_diff_block_lines")
         self.check_ge("max_report_size", "max_page_size")
         self.check_ge("max_report_size", "max_page_size_child")
+
+    def check_parallel(self):
+        from importlib import util
+        multiprocess = util.find_spec("multiprocess")
+        dill = util.find_spec("dill")
+        self.parallel = (multiprocess and dill)
diff --git a/diffoscope/main.py b/diffoscope/main.py
index 1424119..66acb68 100644
--- a/diffoscope/main.py
+++ b/diffoscope/main.py
@@ -371,6 +371,7 @@ def run_diffoscope(parsed_args):
     Config().exclude_commands = parsed_args.exclude_commands
     Config().exclude_directory_metadata = parsed_args.exclude_directory_metadata
     Config().compute_visual_diffs = PresenterManager().compute_visual_diffs()
+    Config().check_parallel()
     Config().check_constraints()
     tool_prepend_prefix(parsed_args.tool_prefix_binutils, *"ar as ld ld.bfd nm objcopy objdump ranlib readelf strip".split())
     set_path()

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