Greatly improve the escript support

The plugin can now easily generate escripts as complex as relx
or rebar/rebar3. It generates a proper structure and allows
embedding extra files by extending the escript-zip target.

Documentation and tests have been added.

1 files changed, 89 insertions, 0 deletions

diff --git a/test/plugin_escript.mk b/test/plugin_escript.mk
new file mode 100644
index 0000000..3916094
--- /dev/null
+++ b/test/plugin_escript.mk
@@ -0,0 +1,89 @@
+# Escript plugin.
+
+ESCRIPT_CASES = build deps extra
+ESCRIPT_TARGETS = $(addprefix escript-,$(ESCRIPT_CASES))
+
+.PHONY: escript $(ESCRIPT_TARGETS)
+
+escript: $(ESCRIPT_TARGETS)
+
+escript-build: build clean
+
+	$i "Bootstrap a new OTP library named $(APP)"
+	$t mkdir $(APP)/
+	$t cp ../erlang.mk $(APP)/
+	$t $(MAKE) -C $(APP) -f erlang.mk bootstrap-lib $v
+
+	$i "Generate a module containing a function main/1"
+	$t printf "%s\n" \
+		"-module($(APP))." \
+		"-export([main/1])." \
+		'main(_) -> io:format("good~n").' > $(APP)/src/$(APP).erl
+
+	$i "Build the escript"
+	$t $(MAKE) -C $(APP) escript $v
+
+	$i "Check that the escript exists"
+	$t test -f $(APP)/$(APP)
+
+	$i "Check that the escript runs"
+	$t $(APP)/$(APP) | grep -q good
+
+	$i "Distclean the application"
+	$t $(MAKE) -C $(APP) distclean $v
+
+	$i "Check that the escript was removed"
+	$t test ! -e $(APP)/$(APP)
+
+escript-deps: build clean
+
+	$i "Bootstrap a new OTP library named $(APP)"
+	$t mkdir $(APP)/
+	$t cp ../erlang.mk $(APP)/
+	$t $(MAKE) -C $(APP) -f erlang.mk bootstrap-lib $v
+
+	$i "Add Ranch to the list of dependencies"
+	$t perl -ni.bak -e 'print;if ($$.==1) {print "DEPS = ranch\n"}' $(APP)/Makefile
+
+	$i "Generate a module containing a function main/1"
+	$t printf "%s\n" \
+		"-module($(APP))." \
+		"-export([main/1])." \
+		'main(_) -> io:format("good~n").' > $(APP)/src/$(APP).erl
+
+	$i "Build the escript"
+	$t $(MAKE) -C $(APP) escript $v
+
+	$i "Check that the escript runs"
+	$t $(APP)/$(APP) | grep -q good
+
+	$i "Check that the escript contains the dependency"
+	$t zipinfo $(APP)/$(APP) 2> /dev/null | grep -q ranch
+
+escript-extra: build clean
+
+	$i "Bootstrap a new OTP library named $(APP)"
+	$t mkdir $(APP)/
+	$t cp ../erlang.mk $(APP)/
+	$t $(MAKE) -C $(APP) -f erlang.mk bootstrap-lib $v
+
+	$i "Instruct Erlang.mk to add extra files to the escript"
+	$t printf "%s\n" \
+		"escript-zip::" \
+		'	$$(verbose) $$(ESCRIPT_ZIP) $$(ESCRIPT_ZIP_FILE) Makefile erlang.mk' >> $(APP)/Makefile
+
+	$i "Generate a module containing a function main/1"
+	$t printf "%s\n" \
+		"-module($(APP))." \
+		"-export([main/1])." \
+		'main(_) -> io:format("good~n").' > $(APP)/src/$(APP).erl
+
+	$i "Build the escript"
+	$t $(MAKE) -C $(APP) escript $v
+
+	$i "Check that the escript runs"
+	$t $(APP)/$(APP) | grep -q good
+
+	$i "Check that the escript contains the extra files"
+	$t zipinfo $(APP)/$(APP) 2> /dev/null | grep -q Makefile
+	$t zipinfo $(APP)/$(APP) 2> /dev/null | grep -q erlang.mk