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# $NetBSD: subst.mk,v 1.60 2019/04/28 12:31:15 rillig Exp $
#
# The subst framework replaces text in one or more files in the WRKSRC
# directory. Packages can define several ``classes'' of replacements.
# Each such class defines:
#
# - in which stage of the build process the replacement happens
# - which files are affected by the replacement
# - which text or pattern is replaced by which replacement text
#
# A typical example is:
#
# SUBST_CLASSES+= prefix
# SUBST_STAGE.prefix= pre-configure
# SUBST_FILES.prefix= ./configure doc/*.html
# SUBST_SED.prefix= -e 's,/usr/local,${PREFIX},g'
#
# Package-settable variables:
#
# SUBST_CLASSES
# A list of class names. When adding new classes to this list, be
# sure to append them (+=) instead of overriding them (=).
#
# 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 before doing the substitution.
#
# SUBST_FILES.<class>
# A list of file patterns on which to run the substitution;
# the filenames are either absolute or relative to ${WRKSRC}.
#
# SUBST_SED.<class>
# List of sed(1) arguments to run on the specified files.
# Multiple commands can be specified using the -e option of sed.
# Do not use non-standard sed options (e.g. -E).
#
# SUBST_VARS.<class>
# List of variables that are substituted whenever they appear in
# the form @VARNAME@. This is basically a shortcut for
#
# -e 's,@VARNAME@,${VARNAME},g'
#
# that even works when ${VARNAME} contains arbitrary characters.
# Both SUBST_SED and SUBST_VARS can be used in a single class.
#
# SUBST_FILTER_CMD.<class>
# Filter used to perform the actual substitution on the specified
# files. Defaults to ${SED} ${SUBST_SED.<class>}.
#
# 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".
#
# 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
#
# Keywords: subst
#
_VARGROUPS+= subst
_PKG_VARS.subst= SUBST_CLASSES
.for c in ${SUBST_CLASSES}
. for pv in SUBST_STAGE SUBST_MESSAGE SUBST_FILES SUBST_SED SUBST_VARS \
SUBST_FILTER_CMD SUBST_SKIP_TEXT_CHECK
_PKG_VARS.subst+= ${pv}.${c}
. endfor
.endfor
_SORTED_VARS.subst= SUBST_CLASSES SUBST_FILES.* SUBST_VARS.*
_LISTED_VARS.subst= SUBST_SED.* SUBST_FILTER_CMD.*
ECHO_SUBST_MSG?= ${STEP_MSG}
# _SUBST_IS_TEXT_FILE returns 0 if $${file} is a text file.
_SUBST_IS_TEXT_FILE?= \
{ nchars=`${WC} -c < "$$file"`; \
notnull=`LC_ALL=C ${TR} -d '\\0' < "$$file" | ${WC} -c`; \
[ "$$nchars" = "$$notnull" ] || ${FALSE} ; \
}
_SUBST_BACKUP_SUFFIX= .subst.sav
.for _class_ in ${SUBST_CLASSES}
_SUBST_COOKIE.${_class_}= ${WRKDIR}/.subst_${_class_}_done
SUBST_FILTER_CMD.${_class_}?= ${SED} ${SUBST_SED.${_class_}}
SUBST_VARS.${_class_}?= # none
SUBST_MESSAGE.${_class_}?= Substituting "${_class_}" in ${SUBST_FILES.${_class_}}
. for v in ${SUBST_VARS.${_class_}}
SUBST_FILTER_CMD.${_class_}+= -e s,@${v:C|[^A-Za-z0-9_]|\\\\&|gW:Q}@,${${v}:S|\\|\\\\|gW:S|,|\\,|gW:S|&|\\\&|gW:S|${.newline}|\\${.newline}|gW:Q},g
. endfor
. if !empty(SUBST_SHOW_DIFF.${_class_}:Uno:M[Yy][Ee][Ss])
_SUBST_KEEP.${_class_}?= ${DIFF} -u "$$file" "$$tmpfile" || true
. endif
_SUBST_KEEP.${_class_}?= ${DO_NADA}
SUBST_SKIP_TEXT_CHECK.${_class_}?= no
.if !empty(SUBST_SKIP_TEXT_CHECK.${_class_}:M[Yy][Ee][Ss])
_SUBST_IS_TEXT_FILE.${_class_}= ${TRUE}
.else
_SUBST_IS_TEXT_FILE.${_class_}= ${_SUBST_IS_TEXT_FILE}
.endif
SUBST_TARGETS+= subst-${_class_}
. if defined(SUBST_STAGE.${_class_})
${SUBST_STAGE.${_class_}}: subst-${_class_}
. else
# SUBST_STAGE.* does not need to be defined.
#PKG_FAIL_REASON+= "SUBST_STAGE missing for ${_class_}."
. endif
.PHONY: subst-${_class_}
subst-${_class_}: ${_SUBST_COOKIE.${_class_}}
${_SUBST_COOKIE.${_class_}}:
. if !empty(SUBST_MESSAGE.${_class_})
${RUN} ${ECHO_SUBST_MSG} ${SUBST_MESSAGE.${_class_}:Q}
. endif
${RUN} cd ${WRKSRC:Q}; \
files=${SUBST_FILES.${_class_}:Q}; \
for file in $$files; do \
case $$file in /*) ;; *) file="./$$file";; esac; \
tmpfile="$$file"${_SUBST_BACKUP_SUFFIX:Q}; \
if [ ! -f "$$file" ]; then \
${WARNING_MSG} "[subst.mk:${_class_}] Ignoring non-existent file \"$$file\"."; \
elif ${_SUBST_IS_TEXT_FILE.${_class_}}; then \
${SUBST_FILTER_CMD.${_class_}} \
< "$$file" \
> "$$tmpfile"; \
if ${TEST} -x "$$file"; then \
${CHMOD} +x "$$tmpfile"; \
fi; \
if ${CMP} -s "$$tmpfile" "$$file"; then \
${INFO_MSG} "[subst.mk:${_class_}] Nothing changed in $$file."; \
${RM} -f "$$tmpfile"; \
else \
${_SUBST_KEEP.${_class_}}; \
${MV} -f "$$tmpfile" "$$file"; \
${ECHO} "$$file" >> ${.TARGET}; \
fi; \
else \
${WARNING_MSG} "[subst.mk:${_class_}] Ignoring non-text file \"$$file\"."; \
fi; \
done
${RUN} ${TOUCH} ${TOUCH_FLAGS} ${.TARGET:Q}
.endfor
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