Use configure-time path for literate-xsl over submodule

The submodule is inconvenient and requires awkward project updates for
changes that might be frequent (as it is developed alongside this project).
If we become worried about BC breaks, then we'll do a version check.

.gitignore

@@ -17,3 +17,7 @@ Makefile
 /tools/missing
 /tools/mdate-sh
 /tools/texinfo.tex
+
+# tools we use (default paths)
+/tools/literate-xsl
+

.gitmodules

@@ -1,6 +1,3 @@
 [submodule "tools/xspec"]
 	path = tools/xspec
 	url = https://github.com/lovullo/xspec
-[submodule "tools/xsltexi"]
-	path = tools/xsltexi
-	url = https://github.com/lovullo/xsltexi

configure.ac

@@ -23,6 +23,14 @@ AM_INIT_AUTOMAKE([foreign])
 AC_ARG_VAR([JAVA], [The Java executable])
 AC_CHECK_PROGS(JAVA, [java])
 
+: ${LITERATE_XSL=tools/literate-xsl}
+AC_ARG_VAR([LITERATE_XSL], [Path to literate-xsl])
+
+AC_MSG_CHECKING([literate-xsl path LITERATE_XSL=$LITERATE_XSL])
+AS_IF(test ! -f "$LITERATE_XSL/src/texinfo.xsl",
+  AC_MSG_ERROR([literate-xsl was not found in path '$LITERATE_XSL'!]))
+AC_MSG_RESULT(done)
+
 AC_CONFIG_FILES([Makefile doc/Makefile])
 
 AC_OUTPUT

doc/Makefile.am

@@ -20,8 +20,7 @@
 
 .DELETE_ON_ERROR:
 
-path_src   := ../src
-path_tools := ../tools
+path_src := ../src
 
 stylesheets := $(shell find "$(path_src)" -name '*.xsl')
 stexi       := $(stylesheets:.xsl=.texi)
@@ -34,7 +33,7 @@ MAKEINFOHTML=$(MAKEINFO) --html
 xsltexis: $(stexi)
 %.texi: %.xsl
 	$(JAVA) -jar "$(SAXON_CP)" \
-	    -xsl:"$(path_tools)/xsltexi/src/xsltexi.xsl" \
+	    -xsl:"$(top_builddir)/@LITERATE_XSL@/src/texinfo.xsl" \
 	    "$<" > "$@"
 
 clean-local: