[gnome-continuous-yocto/gnomeostree-3.28-rocko: 4769/8267] bitbake: lib/bb/utils: Add filter()

[Emmanuele Bassi <ebassi src gnome org>]

commit 3004f57a25514926a0c688d333ea6e6ae3486acc
Author: Peter Kjellerstedt <peter kjellerstedt axis com>
Date:   Tue Feb 21 16:18:59 2017 +0100

    bitbake: lib/bb/utils: Add filter()
    
    The bb.utils.filter() function can be used to filter a variable
    containing whitespace separated words based on another set of words.
    It has been modeled after the bb.utils.contains_any() function.
    
    A typical example of how it can be used is to simplify constructs for
    PACKAGECONFIG that depend on DISTRO_FEATURES:
    
    -PACKAGECONFIG ?= "\
    -    ${@bb.utils.contains('DISTRO_FEATURES', 'acl', 'acl', '', d)} \
    -    ${@bb.utils.contains('DISTRO_FEATURES', 'selinux', 'selinux', '', d)} \
    -"
    +PACKAGECONFIG ?= "${@bb.utils.filter('DISTRO_FEATURES', 'acl selinux', d)}"
    
    (Bitbake rev: 03ae490366d2046f5b5c185fe4ec2adf1b0a902e)
    
    Signed-off-by: Peter Kjellerstedt <peter kjellerstedt axis com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 bitbake/lib/bb/utils.py |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/bitbake/lib/bb/utils.py b/bitbake/lib/bb/utils.py
index 2845126..d6bcfa3 100644
--- a/bitbake/lib/bb/utils.py
+++ b/bitbake/lib/bb/utils.py
@@ -979,6 +979,30 @@ def contains_any(variable, checkvalues, truevalue, falsevalue, d):
         return truevalue
     return falsevalue
 
+def filter(variable, checkvalues, d):
+    """Return all words in the variable that are present in the checkvalues.
+
+    Arguments:
+
+    variable -- the variable name. This will be fetched and expanded (using
+    d.getVar(variable)) and then split into a set().
+
+    checkvalues -- if this is a string it is split on whitespace into a set(),
+    otherwise coerced directly into a set().
+
+    d -- the data store.
+    """
+
+    val = d.getVar(variable)
+    if not val:
+        return ''
+    val = set(val.split())
+    if isinstance(checkvalues, str):
+        checkvalues = set(checkvalues.split())
+    else:
+        checkvalues = set(checkvalues)
+    return ' '.join(sorted(checkvalues & val))
+
 def cpu_count():
     return multiprocessing.cpu_count()