patch 9.0.1627: no generic mechanism to test syntax plugins

Problem:    No generic mechanism to test syntax plugins.
Solution:   Add a syntax plugin test mechanism, using screendumps.  Add a
            simple test for "c".

Filelist

@@ -805,6 +805,11 @@ RT_SCRIPTS =	\
 		runtime/syntax/README.txt \
 		runtime/syntax/shared/*.vim \
 		runtime/syntax/shared/README.txt \
+		runtime/syntax/Makefile \
+		runtime/syntax/testdir/README.txt \
+		runtime/syntax/testdir/runtest.vim \
+		runtime/syntax/testdir/input/*.* \
+		runtime/syntax/testdir/dumps/*.dump \
 
 # Unix runtime
 RT_UNIX =	\

Makefile

@@ -39,14 +39,17 @@ all install uninstall tools config configure reconfig proto depend lint tags typ
 	@echo "Starting make in the src directory."
 	@echo "If there are problems, cd to the src directory and run make there"
 	cd src && $(MAKE) $@
-	@# When the target is "test" also run the indent tests.
+	@# When the target is "test" also run the indent and syntax tests.
 	@if test "$@" = "test"; then \
 		$(MAKE) indenttest; \
+		$(MAKE) syntaxtest; \
 	fi
-	@# When the target is "clean" also clean for the indent tests.
+	@# When the target is "clean" also clean for the indent and syntax tests.
 	@if test "$@" = "clean" -o "$@" = "distclean" -o "$@" = "testclean"; then \
 		cd runtime/indent && \
 			$(MAKE) clean; \
+		cd runtime/syntax && \
+			$(MAKE) clean; \
 	fi
 
 # Executable used for running the indent tests.
@@ -57,6 +60,14 @@ indenttest:
 		$(MAKE) clean && \
 		$(MAKE) test VIM="$(VIM_FOR_INDENTTEST)"
 
+# Executable used for running the syntax tests.
+VIM_FOR_SYNTAXTEST = ../../src/vim
+
+syntaxtest:
+	cd runtime/syntax && \
+		$(MAKE) clean && \
+		$(MAKE) test VIM="$(VIM_FOR_SYNTAXTEST)"
+
 
 #########################################################################
 # 2. Creating the various distribution files.

runtime/syntax/Makefile

@@ -0,0 +1,27 @@
+# Portable Makefile for running syntax tests.
+
+# Override this if needed, e.g. with ../../src/vim
+VIMPROG = vim
+
+# "runtime" relative to "runtime/syntax/testdir"
+VIMRUNTIME = ../..
+
+# Uncomment this line to use valgrind for memory leaks and extra warnings.
+# VALGRIND = valgrind --tool=memcheck --leak-check=yes --num-callers=45 --log-file=valgrind.$*
+
+# ENVVARS = LC_ALL=C LANG=C LANGUAGE=C
+
+RUN_VIMTEST = VIMRUNTIME=$(VIMRUNTIME) $(VALGRIND) $(ENVVARS) $(VIMPROG) -f $(GUI_FLAG)
+
+# Run the tests that didn't run yet or failed previously.
+# If a test succeeds a testdir/done/{name} file will be written.
+# If a test fails a testdir/failed/{name}.dump file will be written.
+test:
+	@# the "vimcmd" file is used by the screendump utils
+	@echo "$(VIMPROG)" > testdir/vimcmd
+	@echo "$(RUN_VIMTEST)" >> testdir/vimcmd
+	VIMRUNTIME=$(VIMRUNTIME) $(VIMPROG) --clean --not-a-term -u testdir/runtest.vim
+
+
+clean testclean:
+	rm -f testdir/failed/* testdir/done/* testdir/vimcmd

runtime/syntax/testdir/README.txt

@@ -0,0 +1,97 @@
+Tests for syntax highlighting plugins
+=====================================
+
+Summary: Files in the "input" directory are edited by Vim with syntax
+highlighting enabled.  Screendumps are generated and compared with the
+expected screendumps in the "dumps" directory.  This will uncover any
+character attributes that differ.
+
+Without any further setup a screendump is made at the top of the file (using
+_00.dump) and another one at the end of the file (using _99.dump).  The dumps
+are normally 20 screen lines tall.
+
+When the screendumps are OK an empty "done/{name}" file is created.  This
+avoids running the test again until "make clean" is used.  Thus you can run
+"make test", see one test fail, try to fix the problem, then run "make test"
+again to only repeat the failing test.
+
+When a screendump differs it is stored in the "failed" directory.  This allows
+for comparing it with the expected screendump, using a command like:
+
+	let fname = '{name}_99.dump'
+	call term_dumpdiff('failed/' .. fname, 'dumps/' .. fname)
+
+
+Creating a syntax plugin test
+-----------------------------
+
+Create a source file in the language you want to test in the "input"
+directory.  Make sure to include some interesting constructs with complicated
+highlighting.
+
+Use the filetype name as the base and a file name extension matching the
+filetype.  Let's use Java as an example.  The file would then be
+"input/java.java".
+
+If there is no further setup required, you can now run the tests:
+	make test
+
+The first time this will fail with an error for a missing screendump.  The
+newly created screendumps will be "failed/java_00.dump",
+"failed/java_01.dump", etc.  You can inspect each with:
+
+	call term_dumpload('failed/java_00.dump')
+	call term_dumpload('failed/java_01.dump')
+	...
+	call term_dumpload('failed/java_99.dump')
+
+If they look OK, move them to the "dumps" directory:
+
+	:!mv failed/java_00.dump dumps
+	:!mv failed/java_01.dump dumps
+	...
+	:!mv failed/java_99.dump dumps
+
+If you now run the test again, it will succeed.
+
+
+Adjusting a syntax plugin test
+------------------------------
+
+If you make changes to the syntax plugin, you should add code to the input
+file to see the effect of these changes.  So that the effect of the changes
+are covered by the test.  You can follow these steps:
+
+1. Edit the syntax plugin somewhere in your personal setup.  Use a file
+   somewhere to try out the changes.
+2. Go to the directory where you have the Vim code checked out and replace the
+   syntax plugin.  Run the tests: "make test".  Usually the tests will still
+   pass, but if you fixed syntax highlighting that was already visible in the
+   input file, carefully check that the changes in the screendump are
+   intentional:
+	let fname = '{name}_99.dump'
+	call term_dumpdiff('failed/' .. fname, 'dumps/' .. fname)
+   Fix the syntax plugin until the result is good.
+2. Edit the input file for your language to add the items you have improved.
+   (TODO: how to add another screendump?).
+   Run the tests and you should get failures.  Like with the previous step,
+   carefully check that the new screendumps in the "failed" directory are
+   good.  Update the syntax plugin and the input file until the highlighting
+   is good and you can see the effect of the syntax plugin improvements.  Then
+   move the screendumps from the "failed" to the "dumps" directory.  Now "make
+   test" should succeed.
+3. Prepare a pull request with the modified files:
+	- syntax plugin:    syntax/{name}.vim
+	- test input file:  syntax/testdir/input/{name}.{ext}
+	- test dump files:  syntax/testdir/dumps/{name}_99.dump
+
+As an extra check you can temporarily put back the old syntax plugin and
+verify that the tests fail.  Then you know your changes are covered by the
+test.
+
+
+
+TODO: run test for one specific filetype
+
+TODO: testing with various option values
+TODO: test syncing by jumping around

runtime/syntax/testdir/dumps/c_00.dump

@@ -0,0 +1,20 @@
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+| +0#0000e05&|*| +0#0000000&@72
+| +0#0000e05&|*| |V|I|M| |-| |V|i| |I|M|p|r|o|v|e|d| @3|b|y| |B|r|a|m| |M|o@1|l|e|n|a@1|r| +0#0000000&@33
+| +0#0000e05&|*| +0#0000000&@72
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+| +0#0000e05&|*| |D|o| |"+0#e000002&|:|h|e|l|p| |c|r|e|d|i|t|s|"| +0#0000e05&|i|n| |V|i|m| |t|o| |s|e@1| |a| |l|i|s|t| |o|f| |p|e|o|p|l|e| |w|h|o| |c|o|n|t|r|i|b|u|t|e|d|.| +0#0000000&@5
+| +0#0000e05&|*| |S|e@1| |R|E|A|D|M|E|.|t|x|t| |f|o|r| |a|n| |o|v|e|r|v|i|e|w| |o|f| |t|h|e| |V|i|m| |s|o|u|r|c|e| |c|o|d|e|.| +0#0000000&@17
+| +0#0000e05&|*|/| +0#0000000&@71
+@75
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+|#+0#e000e06&|i|n|c|l|u|d|e| |"+0#e000002&|v|i|m|.|h|"| +0#0000000&@58
+@75
+|#+0#e000e06&|i|f|d|e|f| |_@1|C|Y|G|W|I|N|_@1| +0#0000000&@57
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+|#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|s|y|s|/|c|y|g|w|i|n|.|h|>| +0#0000000&@7|/+0#0000e05&@1| |f|o|r| |c|y|g|w|i|n|_|c|o|n|v|_|t|o|_|p|o|s|i|x|_|p|a|t|h|(|)| |a|n|d|/|o|r| +0#0000000&@1
+@32|/+0#0000e05&@1| |c|y|g|w|i|n|_|c|o|n|v|_|p|a|t|h|(|)| +0#0000000&@21
+|#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|l|i|m|i|t|s|.|h|>| +0#0000000&@54
+|#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
+@75
+|"|i|n|p|u|t|/|c|.|c|"| |1|2@1|L|,| |3|1|7|4|B| @33|1|,|1| @10|T|o|p| 

runtime/syntax/testdir/dumps/c_01.dump

@@ -0,0 +1,20 @@
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+|#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|s|y|s|/|c|y|g|w|i|n|.|h|>| +0#0000000&@7|/+0#0000e05&@1| |f|o|r| |c|y|g|w|i|n|_|c|o|n|v|_|t|o|_|p|o|s|i|x|_|p|a|t|h|(|)| |a|n|d|/|o|r| +0#0000000&@1
+@32|/+0#0000e05&@1| |c|y|g|w|i|n|_|c|o|n|v|_|p|a|t|h|(|)| +0#0000000&@21
+|#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|l|i|m|i|t|s|.|h|>| +0#0000000&@54
+|#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
+> @74
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+|#+0#e000e06&| |i|n|c|l|u|d|e| |"+0#e000002&|i|s|c|y|g|p|t|y|.|h|"| +0#0000000&@52
+|#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
+@75
+|/+0#0000e05&@1| |V|a|l|u|e|s| |f|o|r| |e|d|i|t|_|t|y|p|e|.| +0#0000000&@50
+|#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|N|O|N|E| @2|0+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |n|o| |e|d|i|t| |t|y|p|e| |y|e|t| +0#0000000&@27
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+|s|t| +0#0000000&@72
+|#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|S|T|D|I|N| @1|2+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |r|e|a|d| |f|i|l|e| |f|r|o|m| |s|t|d|i|n| +0#0000000&@23
+|#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|T|A|G| @3|3+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |t|a|g| |n|a|m|e| |a|r|g|u|m|e|n|t| |g|i|v|e|n|,| |u|s|e| |t|a|g|n|a|m|e| +0#0000000&@7
+|#+0#e000e06&|d|e|f|i|n|e| |E|D|I|T|_|Q|F| @4|4+0#e000002&| +0#e000e06&@6|/+0#0000e05&@1| |s|t|a|r|t| |i|n| |q|u|i|c|k|f|i|x| |m|o|d|e| +0#0000000&@21
+@75
+|#+0#e000e06&|i|f| |(|d|e|f|i|n|e|d|(|U|N|I|X|)| ||@1| |d|e|f|i|n|e|d|(|V|M|S|)@1| |&@1| |!|d|e|f|i|n|e|d|(|N|O|_|V|I|M|_|M|A|I|N|)| +0#0000000&@14
+@57|1|9|,|0|-|1| @7|1|2|%| 

runtime/syntax/testdir/dumps/c_02.dump

@@ -0,0 +1,20 @@
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+|#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
+|s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|m|a|i|n|e|r@1|(|i+0#00e0003&|n|t|,+0#0000000&| |c|h|a|r|_|u| |*|)|;| @39
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+|#+0#e000e06&|i|f|n|d|e|f| |N|O|_|V|I|M|_|M|A|I|N| +0#0000000&@55
+>s+0#00e0003&|t|a|t|i|c| +0#0000000&|v+0#00e0003&|o|i|d| +0#0000000&|u|s|a|g|e|(|v+0#00e0003&|o|i|d|)+0#0000000&|;| @50
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+@57|3|7|,|1| @9|3|0|%| 

runtime/syntax/testdir/dumps/c_03.dump

@@ -0,0 +1,20 @@
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+@75
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+@4|N|_|(|"+0#e000002&|G|a|r|b|a|g|e| |a|f|t|e|r| |o|p|t|i|o|n| |a|r|g|u|m|e|n|t|"|)+0#0000000&|,| @34
+|#+0#e000e06&|d|e|f|i|n|e| |M|E|_|G|A|R|B|A|G|E| @13|3+0#e000002&| +0#0000000&@41
+|@+0#4040ff13&@2| @71
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runtime/syntax/testdir/dumps/c_04.dump

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runtime/syntax/testdir/dumps/c_05.dump

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runtime/syntax/testdir/dumps/c_06.dump

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runtime/syntax/testdir/dumps/c_99.dump

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