rebar.eclass: Optionally provide alternate rebar config to alter

Some packages have separate configs for build and tests. Build config is
always named 'rebar.config' and there seem to be no standard name for
tests config.

eclass/rebar.eclass

@@ -93,17 +93,20 @@ erebar() {
 }
 
 # @FUNCTION: rebar_fix_include_path
-# @USAGE: <project_name>
+# @USAGE: <project_name> [<rebar_config>]
 # @DESCRIPTION:
 # Fix path in rebar.config to 'include' directory of dependant project/package,
 # so it points to installation in system Erlang lib rather than relative 'deps'
 # directory.
 #
+# <rebar_config> is optional. Default is 'rebar.config'.
+#
 # The function dies on failure.
 rebar_fix_include_path() {
 	debug-print-function ${FUNCNAME} "${@}"
 
 	local pn="$1"
+	local rebar_config="${2:-rebar.config}"
 	local erl_libs="${EPREFIX}$(get_erl_libs)"
 	local p
 
@@ -121,19 +124,24 @@ rebar_fix_include_path() {
 	next;
 }
 1
-' rebar.config || die "failed to fix include paths in rebar.config for '${pn}'"
+' "${rebar_config}" || die "failed to fix include paths in ${rebar_config} for '${pn}'"
 }
 
 # @FUNCTION: rebar_remove_deps
+# @USAGE: [<rebar_config>]
 # @DESCRIPTION:
 # Remove dependencies list from rebar.config and deceive build rules that any
 # dependencies are already fetched and built. Otherwise rebar tries to fetch
 # dependencies and compile them.
 #
+# <rebar_config> is optional. Default is 'rebar.config'.
+#
 # The function dies on failure.
 rebar_remove_deps() {
 	debug-print-function ${FUNCNAME} "${@}"
 
+	local rebar_config="${1:-rebar.config}"
+
 	mkdir -p "${S}/deps" && :>"${S}/deps/.got" && :>"${S}/deps/.built" || die
 	gawk -i inplace '
 /^{[[:space:]]*deps[[:space:]]*,/, /}[[:space:]]*\.$/ {
@@ -143,7 +151,7 @@ rebar_remove_deps() {
 	next;
 }
 1
-' rebar.config || die "failed to remove deps from rebar.config"
+' "${rebar_config}" || die "failed to remove deps from ${rebar_config}"
 }
 
 # @FUNCTION: rebar_set_vsn

eclass/tests/rebar_fix_include_path.sh

@@ -77,6 +77,25 @@ test_typical_config() {
 	[[ ${unit_rc}${diff_rc} = 00 ]]
 }
 
+test_typical_config_with_different_name() {
+	local diff_rc
+	local unit_rc
+
+	# Prepare
+	cd "${S}" || die
+	cp typical.config other.config || die
+
+	# Run unit
+	(rebar_fix_include_path foo other.config)
+	unit_rc=$?
+
+	# Test result
+	diff other.config typical.config.expected
+	diff_rc=$?
+
+	[[ ${unit_rc}${diff_rc} = 00 ]]
+}
+
 test_multiple_versions() {
 	local diff_rc
 	local unit_rc
@@ -144,6 +163,10 @@ tbegin "rebar_fix_include_path deals with typical config"
 test_typical_config
 tend $?
 
+tbegin "rebar_fix_include_path deals with typical config with different name"
+test_typical_config_with_different_name
+tend $?
+
 tbegin "rebar_fix_include_path fails on multiple versions of dependency"
 test_multiple_versions
 tend $?

eclass/tests/rebar_remove_deps.sh

@@ -67,6 +67,25 @@ test_typical_config() {
 	[[ ${unit_rc}${diff_rc} = 00 ]]
 }
 
+test_typical_config_with_different_name() {
+	local diff_rc
+	local unit_rc
+
+	# Prepare
+	cd "${S}" || die
+	cp typical.config other.config || die
+
+	# Run unit
+	(rebar_remove_deps other.config)
+	unit_rc=$?
+
+	# Test result
+	diff other.config rebar.config.expected
+	diff_rc=$?
+
+	[[ ${unit_rc}${diff_rc} = 00 ]]
+}
+
 test_deps_in_one_line() {
 	local diff_rc
 	local unit_rc
@@ -92,6 +111,10 @@ tbegin "rebar_remove_deps deals with typical config"
 test_typical_config
 tend $?
 
+tbegin "rebar_remove_deps deals with typical config with different name"
+test_typical_config_with_different_name
+tend $?
+
 tbegin "rebar_remove_deps deals with all deps in one line"
 test_deps_in_one_line
 tend $?