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Added an autoconf option to detect a markdown preprocessor #46

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Added an autoconf option to detect a markdown preprocessor #46

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3 changes: 3 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,9 @@ dnl Lua >= 5.1
AX_PROG_LUA(5.1, 5.4)
AX_LUA_HEADERS

dnl markdown converter
AC_PROG_MARKDOWN

dnl Generate output files
AC_CONFIG_MACRO_DIR(m4)
AC_CONFIG_HEADER(config.h)
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2 changes: 1 addition & 1 deletion doc/Makefile.am
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Expand Up @@ -2,4 +2,4 @@ dist_doc_DATA += doc/alien.html
dist_doc_DATA += doc/alien.md

doc/alien.html: $(srcdir)/doc/alien.md
markdown $< > $@
@ac_markdown_prog@ $< > $@
18 changes: 18 additions & 0 deletions m4/markdown.m4
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@@ -0,0 +1,18 @@
#===
# autoconf macro to check for markdown converters
#

m4_define_default([_AC_MARKDOWN_PROGS],
[markdown \
pandoc])
AC_DEFUN([AC_PROG_MARKDOWN], [
AC_ARG_VAR([MARKDOWN_PROG], [Markdown converter, e.g. /usr/bin/pandoc])
AS_IF([test "x$MARKDOWN_PROG" != 'x'],
[
AC_MSG_RESULT(using $MARKDOWN_PROG to process markdown)
AC_SUBST(ac_markdown_prog, $MARKDOWN_PROG)],
[
AC_CHECK_PROGS(_MARKDOWN_PROG, [_AC_MARKDOWN_PROGS],"")
AS_IF([test "x$_MARKDOWN_PROG" != 'x'],
[AC_SUBST(ac_markdown_prog, $_MARKDOWN_PROG)],
[AC_MSG_ERROR([cannot find a markdown converter (_AC_MARKDOWN_PROGS)])])])])