Makefile: build-src: Add new target to extract .c files from EXAMPLES

The target has an alias 'src'.
This is especially useful to automate testing of those files.

Cc: Stephen Kitt <steve@sk2.org>
Cc: "G. Branden Robinson" <g.branden.robinson@gmail.com>
Cc: Ingo Schwarze <schwarze@usta.de>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>

diff --git a/Makefile b/Makefile
index 812c6e86816b6534f8c7c4144beeb5221e0ec28a..a6789c329dc337bff664073abb2c15ecc05defb1 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -34,6 +34,7 @@ srcdir   := .
 builddir := tmp
 LINTDIR  := $(builddir)/lint
 HTMLDIR  := $(builddir)/html
+SRCDIR   := $(builddir)/src
 
 DESTDIR  :=
 prefix   := /usr/local
@@ -99,9 +100,11 @@ MAN2HTMLFLAGS         := $(DEFAULT_MAN2HTMLFLAGS) $(EXTRA_MAN2HTMLFLAGS)
 INSTALL      := install
 INSTALL_DATA := $(INSTALL) -m 644
 INSTALL_DIR  := $(INSTALL) -m 755 -d
+MKDIR        := mkdir -p
 RM           := rm
 RMDIR        := rmdir --ignore-fail-on-non-empty
 GROFF        := groff
+MAN          := man
 MANDOC       := mandoc
 MAN2HTML     := man2html
 
@@ -163,10 +166,20 @@ _man7pages := $(filter %$(man7ext),$(_manpages))
 _man8pages := $(filter %$(man8ext),$(_manpages))
 LINT_groff :=$(patsubst $(MANDIR)/%,$(LINTDIR)/%.lint.groff.touch,$(LINTPAGES))
 LINT_mandoc:=$(patsubst $(MANDIR)/%,$(LINTDIR)/%.lint.mandoc.touch,$(LINTPAGES))
+SRCPAGEDIRS:=$(patsubst $(MANDIR)/%,$(SRCDIR)/%.d,$(LINTPAGES))
+UNITS_c    := $(sort $(patsubst $(MANDIR)/%,$(SRCDIR)/%,$(shell \
+               find $(MANDIR)/man?/ -type f \
+               | grep '$(manext)$$' \
+               | xargs grep -l '^\.TH ' \
+               | while read m; do \
+                       <$$m \
+                       sed -n "s,^\... SRC BEGIN (\(.*.c\))$$,$$m.d/\1,p"; \
+               done)))
 
 MANDIRS   := $(sort $(shell find $(MANDIR)/man? -type d))
 HTMLDIRS  := $(patsubst $(MANDIR)/%,$(HTMLDIR)/%/.,$(MANDIRS))
 LINTDIRS  := $(patsubst $(MANDIR)/%,$(LINTDIR)/%/.,$(MANDIRS))
+SRCDIRS   := $(patsubst $(MANDIR)/%,$(SRCDIR)/%/.,$(MANDIRS))
 _htmldirs := $(patsubst $(HTMLDIR)/%,$(DESTDIR)$(htmldir_)/%,$(HTMLDIRS))
 _mandirs  := $(patsubst $(MANDIR)/%,$(DESTDIR)$(mandir)/%/.,$(MANDIRS))
 _man0dir  := $(filter %man0/.,$(_mandirs))
@@ -248,6 +261,38 @@ uninstall-man: $(_mandir_rmdir) $(uninstall_manX)
        @:
 
 
+########################################################################
+# src
+
+$(SRCPAGEDIRS): $(SRCDIR)/%.d: $(MANDIR)/% | $$(@D)/.
+       $(info MKDIR    $@)
+       $(MKDIR) $@
+       touch $@
+
+$(UNITS_c): $$(@D)
+       $(info SED      $@)
+       <$(patsubst $(SRCDIR)/%.d,$(MANDIR)/%,$<) \
+       sed -n \
+               -e '/^\.TH/,/^\.SH/{/^\.SH/!p}' \
+               -e '/^\.SH EXAMPLES/p' \
+               -e "/^\... SRC BEGIN ($(@F))$$/,/^\... SRC END$$/p" \
+       | $(MAN) -P cat -l - \
+       | sed '/^[^ ]/d' \
+       | sed 's/^       //' \
+       >$@ \
+       || exit $$?
+
+$(SRCDIRS): %/.: | $$(dir %). $(SRCDIR)/.
+
+.PHONY: build-src src
+build-src src: $(UNITS_c) | builddirs-src
+       @:
+
+.PHONY: builddirs-src
+builddirs-src: $(SRCDIRS)
+       @:
+
+
 ########################################################################
 # lint