subst.mk is a Makefile fragment that implements a general text replacement

facility for different classes of files in ${WRKSRC}.  For each class of
files, a target <class>-subst is created to perform the text replacement.

The following variables are used:

SUBST_STAGE.<class>
	"stage" at which we do the text replacement, e.g. pre-configure,
	post-build, etc.

SUBST_MESSAGE.<class>
	message to display, noting what is being substituted

SUBST_FILES.<class>
	files on which to run the substitution; these are relative to
	${WRKSRC}

SUBST_SED.<class>
	sed(1) substitution expression to run on the specified files

This basically extracts a useful piece of code from bsd.buildlink2.mk and
puts it in a place that allows it to be more widely used, and so that the
functionality doesn't depend on USE_BUILDLINK2 being defined.

1 files changed, 80 insertions, 0 deletions

diff --git a/mk/subst.mk b/mk/subst.mk
new file mode 100644
index 00000000000..e360d39677a
--- /dev/null
+++ b/mk/subst.mk
@@ -0,0 +1,80 @@
+# $NetBSD: subst.mk,v 1.1 2003/08/27 11:24:37 jlam Exp $
+#
+# This Makefile fragment implements a general text replacement facility
+# for different classes of files in ${WRKSRC}.  For each class of files,
+# a target <class>-subst is created to perform the text replacement.
+#
+# The following variables are used:
+#
+# SUBST_STAGE.<class>
+#	"stage" at which we do the text replacement, e.g. pre-configure,
+#	post-build, etc.
+#
+# SUBST_MESSAGE.<class>
+#	message to display, noting what is being substituted
+#                                      
+# SUBST_FILES.<class>
+#	files on which to run the substitution; these are relative to
+#	${WRKSRC}
+#
+# SUBST_SED.<class>
+#	sed(1) substitution expression to run on the specified files
+
+ECHO_SUBST_MSG?=	${ECHO}
+
+# _SUBST_IS_TEXT_FILE returns 0 if $${file} is a text file.
+_SUBST_IS_TEXT_FILE?= \
+	${FILE_CMD} $${file} | ${EGREP} "(shell script|text)" >/dev/null 2>&1
+
+.for _class_ in ${SUBST_CLASSES}
+_SUBST_COOKIE.${_class_}=	${WRKDIR}/.subst_${_class_}_done
+
+SUBST_TARGETS+=			subst-${_class_}
+_SUBST_TARGETS.${_class_}=	subst-${_class_}-message
+_SUBST_TARGETS.${_class_}+=	${_SUBST_COOKIE.${_class_}}
+_SUBST_TARGETS.${_class_}+=	subst-${_class_}-cookie
+
+.ORDER: ${_SUBST_TARGETS.${_class_}}
+
+.if defined(SUBST_STAGE.${_class_})
+${SUBST_STAGE.${_class_}}: subst-${_class_}
+.endif
+
+.PHONY: subst-${_class_}
+subst-${_class_}: ${_SUBST_TARGETS.${_class_}}
+
+.PHONY: subst-${_class_}-message
+ subst-${_class_}-message:
+	${_PKG_SILENT}${_PKG_DEBUG}					\
+	${ECHO_SUBST_MSG} "=> ${SUBST_MESSAGE.${_class_}}"
+
+.PHONY: subst-${_class_}-cookie
+ subst-${_class_}-cookie:
+	${_PKG_SILENT}${_PKG_DEBUG}					\
+	${TOUCH} ${TOUCH_FLAGS} ${_SUBST_COOKIE.${_class_}}
+
+${_SUBST_COOKIE.${_class_}}:
+.  if !empty(SUBST_SED.${_class_})
+	${_PKG_SILENT}${_PKG_DEBUG}					\
+	cd ${WRKSRC};							\
+	files="${SUBST_FILES.${_class_}}";				\
+	case "$$files" in						\
+	"")	;;							\
+	*)	for file in $${files}; do				\
+			if ${_SUBST_IS_TEXT_FILE}; then			\
+				${MV} -f $$file $$file.subst.sav;	\
+				${SED}  ${SUBST_SED.${_class_}}		\
+					$$file.subst.sav > $$file;	\
+				if [ -x $$file.subst.sav ]; then	\
+					${CHMOD} +x $$file;		\
+				fi;					\
+				if ${CMP} -s $$file.subst.sav $$file; then \
+					${MV} -f $$file.subst.sav $$file; \
+				else					\
+					${ECHO} $$file >> ${.TARGET};	\
+				fi;					\
+			fi;						\
+		done ;;							\
+	esac
+.  endif
+.endfor