[diffoscope] 02/03: tools: add a get_package_provider() function, returning the package name that best matches the system

[Mattia Rizzolo]

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mattia pushed a commit to branch master
in repository diffoscope.

commit e62306e17e8a9b981d3b7f427bc99f8582a0301a
Author: Mattia Rizzolo <mattia at debian.org>
Date:   Fri Jul 14 11:45:04 2017 +0200

    tools: add a get_package_provider() function, returning the package name that best matches the system
    
    This function uses distro.like() to obtain a list of distributions
    similar to the one we are running on.
    It means that we will, for example, be able to suggest Debian packages
    when running under Ubuntu.
    
    Gbp-Dch: Short
    Signed-off-by: Mattia Rizzolo <mattia at debian.org>
---
 diffoscope/tools.py | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/diffoscope/tools.py b/diffoscope/tools.py
index 148758b..fd483b4 100644
--- a/diffoscope/tools.py
+++ b/diffoscope/tools.py
@@ -29,6 +29,7 @@ except ImportError:
 from distutils.spawn import find_executable
 
 from .profiling import profile
+from .external_tools import EXTERNAL_TOOLS
 
 # Memoize calls to ``distutils.spawn.find_executable`` to avoid excessive stat
 # calls
@@ -81,3 +82,27 @@ def get_current_os():
         if distro:
             return distro.id()
     return system  # noqa
+
+def get_current_distro_like():
+    if distro:
+        return distro.like().split()
+    else:
+        return []
+
+def get_package_provider(tool, os=None):
+    try:
+        providers = EXTERNAL_TOOLS[tool]
+    except KeyError:  # noqa
+        return None
+
+    try:
+        return providers[get_current_os()]
+    except KeyError:
+        # lookup failed, try to look for a package for a similar distro
+        for d in get_current_distro_like():
+            try:
+                return providers[d]
+            except KeyError:
+                pass
+
+    return None

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