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# $NetBSD: subst.mk,v 1.72 2020/03/23 11:27:29 jperkin 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'
#
# User-settable variables:
#
# SUBST_SHOW_DIFF
# Whether to log each changed file as a unified diff, for all
# SUBST classes. Defaults to "no".
#
# 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 ${WRKSRC}.
#
# Starting with 2020Q1, it is an error if any of these patterns
# has no effect at all, to catch typos and outdated definitions.
# To prevent this, see SUBST_NOOP_OK.<class> below.
#
# In most cases the filename patterns are given directly.
# If that is not flexible enough, use the :sh variable modifier.
# See mk/configure/replace-localedir.mk for an example.
#
# SUBST_SED.<class>
# List of sed(1) arguments to run on the specified files.
# Multiple commands can be specified using the -e option of sed.
# Do not use non-standard sed options (e.g. -E).
#
# SUBST_VARS.<class>
# List of variables that are substituted whenever they appear in
# the form @VARNAME@. This is basically a shortcut for
#
# -e 's,@VARNAME@,${VARNAME},g'
#
# that even works when ${VARNAME} contains arbitrary characters.
# SUBST_SED and SUBST_VARS can combined freely.
#
# 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.
#
# SUBST_NOOP_OK.<class>
# Whether to fail when a SUBST_FILES pattern has no effect.
# In most cases, "yes" is appropriate, to catch typos and outdated
# definitions.
#
# Default: no (up to 2019Q4), yes (starting with 2020Q1)
#
# See also:
# PLIST_SUBST
#
# Keywords: subst
#
_VARGROUPS+= subst
_PKG_VARS.subst= SUBST_CLASSES
SUBST_SHOW_DIFF?= no
.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 SUBST_NOOP_OK
_PKG_VARS.subst+= ${pv}.${c}
. endfor
.endfor
_DEF_VARS.subst= ECHO_SUBST_MSG
_USE_VARS.subst= WRKDIR WRKSRC
_IGN_VARS.subst= _SUBST_IS_TEXT_FILE_CMD
_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_CMD returns 0 if $$file is a text file.
_SUBST_IS_TEXT_FILE_CMD?= \
[ -z "`LC_ALL=C ${TR} -cd '\\0' < "$$file" | ${TR} '\\0' 'x'`" ]
.if ${SUBST_CLASSES:U:O} != ${SUBST_CLASSES:U:O:u}
PKG_FAIL_REASON+= "[subst.mk] duplicate SUBST class in: ${SUBST_CLASSES:O}"
.endif
.for _class_ in ${SUBST_CLASSES:O:u}
_SUBST_COOKIE.${_class_}= ${WRKDIR}/.subst_${_class_}_done
SUBST_FILTER_CMD.${_class_}?= LC_ALL=C ${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 ${SUBST_SHOW_DIFF.${_class_}:U${SUBST_SHOW_DIFF}:tl} == yes
_SUBST_KEEP.${_class_}?= LC_ALL=C ${DIFF} -u "$$file" "$$tmpfile" || true
. endif
_SUBST_KEEP.${_class_}?= ${DO_NADA}
SUBST_SKIP_TEXT_CHECK.${_class_}?= no
SUBST_NOOP_OK.${_class_}?= yes # TODO: change to no after 2020Q1
_SUBST_WARN.${_class_}= ${${SUBST_NOOP_OK.${_class_}:tl} == yes:?${INFO_MSG}:${WARNING_MSG}} "[subst.mk:${_class_}]"
.if !empty(SUBST_SKIP_TEXT_CHECK.${_class_}:M[Yy][Ee][Ss])
_SUBST_IS_TEXT_FILE_CMD.${_class_}= ${TRUE}
.else
_SUBST_IS_TEXT_FILE_CMD.${_class_}= ${_SUBST_IS_TEXT_FILE_CMD}
.endif
. if defined(SUBST_STAGE.${_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_}}:
${RUN} message=${SUBST_MESSAGE.${_class_}:Q}; \
if [ "$$message" ]; then ${ECHO_SUBST_MSG} "$$message"; fi
${RUN} \
basedir=${WRKSRC:Q}; \
emptydir="$$basedir/.subst-empty"; \
patterns=${SUBST_FILES.${_class_}:Q}; \
${MKDIR} "$$emptydir"; cd "$$emptydir"; \
for pattern in $$patterns; do \
changed=no; \
cd "$$basedir"; \
for file in $$pattern; do \
case $$file in /*) ;; *) file="./$$file";; esac; \
tmpfile="$$file.subst.sav"; \
if [ ! -f "$$file" ]; then \
[ -d "$$file" ] || ${_SUBST_WARN.${_class_}} "Ignoring non-existent file \"$$file\"."; \
elif ${_SUBST_IS_TEXT_FILE_CMD.${_class_}}; then \
${SUBST_FILTER_CMD.${_class_}} \
< "$$file" \
> "$$tmpfile"; \
if ${TEST} -x "$$file"; then \
${CHMOD} +x "$$tmpfile"; \
fi; \
if ${CMP} -s "$$tmpfile" "$$file"; then \
${_SUBST_WARN.${_class_}} "Nothing changed in $$file."; \
${RM} -f "$$tmpfile"; \
else \
changed=yes; \
${_SUBST_KEEP.${_class_}}; \
${MV} -f "$$tmpfile" "$$file"; \
${ECHO} "$$file" >> ${.TARGET}.tmp; \
fi; \
else \
${_SUBST_WARN.${_class_}} "Ignoring non-text file \"$$file\"."; \
fi; \
done; \
\
if test "$$changed,${SUBST_NOOP_OK.${_class_}:tl}" = no,no; then \
${FAIL_MSG} "[subst.mk:${_class_}] The pattern $$pattern has no effect."; \
fi; \
done; \
cd ${WRKDIR}; ${RMDIR} "$$emptydir"
${RUN} ${TOUCH} ${TOUCH_FLAGS} ${.TARGET}.tmp && ${MV} ${.TARGET}.tmp ${.TARGET}
.endfor
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