[pkgsrc/trunk]: pkgsrc/mk Allow package developers to easily see and check th...

[rillig <rillig%pkgsrc.org@localhost>]

details:   https://anonhg.NetBSD.org/pkgsrc/rev/fc97cf37aef0
branches:  trunk
changeset: 373479:fc97cf37aef0
user:      rillig <rillig%pkgsrc.org@localhost>
date:      Tue Jan 02 21:18:48 2018 +0000

description:
Allow package developers to easily see and check the SUBST changes.

diffstat:

 mk/subst.mk |  9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diffs (30 lines):

diff -r e71f0d93d0be -r fc97cf37aef0 mk/subst.mk
--- a/mk/subst.mk       Tue Jan 02 21:11:10 2018 +0000
+++ b/mk/subst.mk       Tue Jan 02 21:18:48 2018 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: subst.mk,v 1.55 2016/01/31 17:27:41 rillig Exp $
+# $NetBSD: subst.mk,v 1.56 2018/01/02 21:18:48 rillig Exp $
 #
 # This Makefile fragment implements a general text replacement facility.
 # Package makefiles define a ``class'', for each of which a particular
@@ -45,6 +45,10 @@
 #      before any substitutions are done to it. Since that test is not
 #      perfect, it can be disabled by setting this variable to "yes".
 #
+# SUBST_SHOW_DIFF.<class>
+#      During development of a package, this can be set to "yes" to see
+#      the actual changes as a unified diff.
+#
 # See also:
 #      PLIST_SUBST
 #
@@ -80,6 +84,9 @@
 .  for v in ${SUBST_VARS.${_class_}}
 SUBST_FILTER_CMD.${_class_} += -e s,@${v}@,${${v}:S|\\|\\\\|gW:S|,|\\,|gW:S|&|\\\&|gW:Q},g
 .  endfor
+.  if !empty(SUBST_SHOW_DIFF.${_class_}:Uno:M[Yy][Ee][Ss])
+_SUBST_KEEP.${_class_}?=       ${DIFF} -u "$$file" "$$tmpfile" || true
+.  endif
 _SUBST_KEEP.${_class_}?=       ${DO_NADA}
 SUBST_SKIP_TEXT_CHECK.${_class_}?=     no