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# $NetBSD: subst.mk,v 1.22 2005/06/09 19:49:48 rillig Exp $
#
# This Makefile fragment implements a general text replacement facility.
# Package makefiles define a ``class'', for each of which a particular
# substitution description can be defined. For each class of files, a
# target subst-<class> is created to perform the text replacement.
#
# The following variables are used:
#
# SUBST_CLASSES
# A list of class names. A new class name must be appended (+=).
#
# 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
#
# SUBST_FILTER_CMD.<class>
# filter used to perform the actual substitution on the specified
# files. Defaults to ${SED} ${SUBST_SED.<class>}.
#
# SUBST_POSTCMD.<class>
# command to clean up after sed(1). Defaults to ${RM} -f
# $$file${_SUBST_BACKUP_SUFFIX}. For debugging, set it to ${DO_NADA}.
ECHO_SUBST_MSG?= ${ECHO}
# _SUBST_IS_TEXT_FILE returns 0 if $${file} is a text file.
_SUBST_IS_TEXT_FILE?= \
{ ${TEST} -f "$$file" \
&& ${FILE_CMD} "$$file" \
| ${EGREP} "(executable .* script|shell script|text)"; \
} >/dev/null 2>&1
_SUBST_BACKUP_SUFFIX= .subst.sav
.for _class_ in ${SUBST_CLASSES}
_SUBST_COOKIE.${_class_}= ${WRKDIR}/.subst_${_class_}_done
SUBST_FILTER_CMD.${_class_}?= ${SED} ${SUBST_SED.${_class_}}
SUBST_POSTCMD.${_class_}?= ${RM} -f "$$tmpfile"
SUBST_TARGETS+= subst-${_class_}
_SUBST_TARGETS.${_class_}= subst-${_class_}-message
_SUBST_TARGETS.${_class_}+= ${_SUBST_COOKIE.${_class_}}
_SUBST_TARGETS.${_class_}+= subst-${_class_}-cookie
.ORDER: ${_SUBST_TARGETS.${_class_}}
. if defined(SUBST_STAGE.${_class_})
${SUBST_STAGE.${_class_}}: subst-${_class_}
. endif
.PHONY: subst-${_class_}
subst-${_class_}: ${_SUBST_TARGETS.${_class_}}
.PHONY: subst-${_class_}-message
subst-${_class_}-message:
. if defined(SUBST_MESSAGE.${_class_})
${_PKG_SILENT}${_PKG_DEBUG} \
${ECHO_SUBST_MSG} "=> "${SUBST_MESSAGE.${_class_}}
. endif
.PHONY: subst-${_class_}-cookie
subst-${_class_}-cookie:
${_PKG_SILENT}${_PKG_DEBUG} \
${TOUCH} ${TOUCH_FLAGS} ${_SUBST_COOKIE.${_class_}}
${_SUBST_COOKIE.${_class_}}:
${_PKG_SILENT}${_PKG_DEBUG} \
cd ${WRKSRC:Q}; \
files=${SUBST_FILES.${_class_}:Q}; \
for file in $$files; do \
file="./$$file"; \
tmpfile="$$file"${_SUBST_BACKUP_SUFFIX:Q}; \
if ${_SUBST_IS_TEXT_FILE}; then \
${MV} -f "$$file" "$$tmpfile" || exit 1; \
${CAT} "$$tmpfile" \
| ${SUBST_FILTER_CMD.${_class_}} \
> "$$file"; \
if ${TEST} -x "$$tmpfile"; then \
${CHMOD} +x "$$file"; \
fi; \
if ${CMP} -s "$$tmpfile" "$$file"; then \
${MV} -f "$$tmpfile" "$$file"; \
else \
${SUBST_POSTCMD.${_class_}}; \
${ECHO} "$$file" >> ${.TARGET}; \
fi; \
fi; \
done
.endfor
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