-also check for LaTeX packages used by gnunet-bcd

Just checking if the command is available is not enough; for example, some
people might not have TikZ installed, a package required to draw the logo on
the business cards.

1 files changed, 42 insertions, 0 deletions

diff --git a/m4/check-latex-package.m4 b/m4/check-latex-package.m4
new file mode 100644
index 000000000..7b7861134
--- /dev/null
+++ b/m4/check-latex-package.m4
@@ -0,0 +1,42 @@
+dnl
+dnl CHECK_LATEX_PACKAGE(FEATURE-NAME,
+dnl                     PACKAGE-NAME,
+dnl                     ACTION-IF-FOUND,
+dnl                     ACTION-IF-NOT-FOUND)
+dnl
+dnl Tries to compile a small LaTeX document to see if the requested package is
+dnl available to be used with \usepackage.
+dnl
+dnl The result will be cached in the ac_cv_tex_PACKAGE-NAME variable.
+dnl
+dnl This macro also checks for pdflatex as in AC_CHECK_PROGS and the result
+dnl is made available in the PDFLATEX_BINARY variable (all capitals like that.)
+dnl
+dnl FEATURE-NAME is one or more words to identify the check;
+dnl PACKAGE-NAME is the package as it appears in the \usepackage statement
+dnl ACTION-IF-FOUND (optional) commands to execute if the package is installed
+dnl ACTION-IF-NOT-FOUND (optional) the inverse of ACTION-IF-FOUND
+dnl
+AC_DEFUN([CHECK_LATEX_PACKAGE],
+[AC_CHECK_PROGS([PDFLATEX_BINARY], [pdflatex], [no])
+
+ AS_IF([test "x$ac_cv_prog_PDFLATEX_BINARY" = "xno"],
+   [m4_if([$4], ,:,[$4])],
+   [AC_CACHE_CHECK([for the $1 package for LaTeX], [AS_TR_SH([ac_cv_tex_][$2])],
+      [cat <<EOF > conftest.tex
+\\documentclass{article}
+\\usepackage{$2}
+\\begin{document}
+Hello
+\\end{document}
+EOF
+
+       "$ac_cv_prog_PDFLATEX_BINARY" conftest.tex 1>/dev/null 2>&1
+       AS_IF([test "x$?" = "x0"],
+         [AS_VAR_SET([AS_TR_SH([ac_cv_tex_][$2])], [yes])],
+         [AS_VAR_SET([AS_TR_SH([ac_cv_tex_][$2])], [no])])])
+
+    AS_VAR_IF([AS_TR_SH([ac_cv_tex_][$2])], [xyes],
+      [m4_if([$3], ,:,[$3])],
+      [m4_if([$4], ,:,[$4])])])
+])dnl