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# $NetBSD: subst.mk,v 1.42 2007/01/23 06:05:39 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.
#
# Package-settable variables:
#
# 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. Should be one of
# {pre,do,post}-{extract,patch,configure,build,install}.
#
# SUBST_MESSAGE.<class>
# The message to display when the substitution is done.
#
# SUBST_FILES.<class>
# A list of file patterns on which to run the substitution;
# the filenames are either absolute or relative to ${WRKSRC}.
#
# SUBST_SED.<class>
# List of sed(1) arguments to run on the specified files. Multiple
# commands can be specified using the -e option of sed.
#
# SUBST_VARS.<class>
# List of variables that are substituted whenever they appear in
# the form @VARNAME@. This is basically a short-cut for
#
# -e 's,@VARNAME@,${VARNAME},g'
#
# also taking care of (most) quoting issues.
#
# 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
# $$file${_SUBST_BACKUP_SUFFIX}. For debugging, set it to ${DO_NADA}.
#
# SUBST_SKIP_TEXT_CHECK.<class>
# By default, each file is checked whether it really is a text file
# before any substitutions are done to it. Since that test is not
# perfect, it can be disabled by setting this variable to "yes".
#
# Keywords: subst
#
ECHO_SUBST_MSG?= ${STEP_MSG}
# _SUBST_IS_TEXT_FILE returns 0 if $${file} is a text file.
_SUBST_IS_TEXT_FILE?= \
{ ${TEST} -f "$$file" \
&& ${FILE_CMD} "$$file" \
| ${EGREP} "(executable .* script|shell script|text|Assembler source|libtool)"; \
} >/dev/null 2>&1
_SUBST_BACKUP_SUFFIX= .subst.sav
.for _class_ in ${SUBST_CLASSES}
_SUBST_COOKIE.${_class_}= ${WRKDIR}/.subst_${_class_}_done
SUBST_VARS.${_class_}?= # none
SUBST_FILTER_CMD.${_class_}?= ${SED} ${SUBST_SED.${_class_}} ${SUBST_VARS.${_class_}:@v@-e 's,\@${v}\@,'${${v}:Q}',g' @}
SUBST_POSTCMD.${_class_}?= ${RM} -f "$$tmpfile"
SUBST_SKIP_TEXT_CHECK.${_class_}?= no
.if !empty(SUBST_SKIP_TEXT_CHECK.${_class_}:M[Yy][Ee][Ss])
_SUBST_IS_TEXT_FILE.${_class_}= ${TRUE}
.else
_SUBST_IS_TEXT_FILE.${_class_}= ${_SUBST_IS_TEXT_FILE}
.endif
SUBST_TARGETS+= subst-${_class_}
. if defined(SUBST_STAGE.${_class_})
${SUBST_STAGE.${_class_}}: subst-${_class_}
. else
# SUBST_STAGE.* does not need to be defined.
#PKG_FAIL_REASON+= "SUBST_STAGE missing for ${_class_}."
. endif
.PHONY: subst-${_class_}
subst-${_class_}: ${_SUBST_COOKIE.${_class_}}
${_SUBST_COOKIE.${_class_}}:
. if defined(SUBST_MESSAGE.${_class_})
${_PKG_SILENT}${_PKG_DEBUG} \
${ECHO_SUBST_MSG} ${SUBST_MESSAGE.${_class_}:Q}
. endif
${_PKG_SILENT}${_PKG_DEBUG} set -e; \
cd ${WRKSRC:Q}; \
files=${SUBST_FILES.${_class_}:Q}; \
for file in $$files; do \
case $$file in /*) ;; *) file="./$$file";; esac; \
tmpfile="$$file"${_SUBST_BACKUP_SUFFIX:Q}; \
if ${_SUBST_IS_TEXT_FILE.${_class_}}; then \
${MV} -f "$$file" "$$tmpfile" || exit 1; \
${SUBST_FILTER_CMD.${_class_}} \
< "$$tmpfile" \
> "$$file"; \
if ${TEST} -x "$$tmpfile"; then \
${CHMOD} +x "$$file"; \
fi; \
if ${CMP} -s "$$tmpfile" "$$file"; then \
${INFO_MSG} "[subst.mk:${_class_}] Nothing changed in $$file."; \
${MV} -f "$$tmpfile" "$$file"; \
else \
${SUBST_POSTCMD.${_class_}}; \
${ECHO} "$$file" >> ${.TARGET}; \
fi; \
elif ${TEST} -f "$$file"; then \
${WARNING_MSG} "[subst.mk:${_class_}] Ignoring non-text file \"$$file\"."; \
else \
${WARNING_MSG} "[subst.mk:${_class_}] Ignoring non-existent file \"$$file\"."; \
fi; \
done
${_PKG_SILENT}${_PKG_DEBUG} set -e; \
${TOUCH} ${TOUCH_FLAGS} ${.TARGET:Q}
.endfor
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