ensure that `v fmt` can be run over most .v files on each PR

.github/workflows/ci.yml

@@ -2,6 +2,23 @@ name: CI
 on: [push, pull_request]
 jobs:
 
+  v-fmt:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: getting all branch metainfo from github
+      run: |
+          git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*
+          echo "Changed files compared to origin/master are:" && git diff --name-status origin/master HEAD -- '*.v'
+    - name: Build v (there is no need for dependencies for fmt)
+      run: make -j4
+    - name: Build a production tools/vfmt 
+      run: ./v -prod -d vfmt tools/vfmt.v
+    - name: fmt only the changed files (from master)
+      run: git diff --name-status origin/master HEAD -- '*.v' |grep -v '^D'|cut -f2- | xargs ./v fmt -diff
+    - name: Run v test-fmt
+      run: ./v test-fmt
+
   ubuntu-tcc:
     runs-on: ubuntu-18.04
     env:

.gitignore

@@ -12,6 +12,7 @@ fns.txt
 /tools/vrepl
 /tools/vtest
 /tools/vtest-compiler
+/tools/vtest-fmt
 /tools/vfmt
 /tools/vup
 /tools/vpm
@@ -26,6 +27,7 @@ fns.txt
 /v_prod_g
 *.exe
 *.o
+*.so
 .*.c
 *.tmp.c
 vjs

tools/vtest-compiler.v

@@ -18,20 +18,12 @@ fn main() {
 }
 
 fn v_test_compiler(vargs string) {
-	v_test_compiler2(vargs)
-	//make_sure_vfmt_was_run()
-}
-
-fn v_test_compiler2(vargs string){
-
 	vexe := testing.vexe_path()
 	parent_dir := filepath.dir(vexe)
 	testing.vlib_should_be_present(parent_dir)
-
 	// Changing the current directory is needed for some of the compiler tests,
 	// compiler/tests/local_test.v and compiler/tests/repl/repl_test.v
 	os.chdir(parent_dir)
-
 	/*
 	if !os.exists(parent_dir + '/v.v') {
 		eprintln('v.v is missing, it must be next to the V executable')
@@ -50,22 +42,16 @@ fn v_test_compiler2(vargs string){
 			eprintln('v.c can be compiled without warnings. This is good :)')
 		}
 	}
-
 	building_tools_failed := testing.v_build_failing(vargs, 'tools')
-
 	eprintln('\nTesting all _test.v files...')
 	mut compiler_test_session := testing.new_test_session(vargs)
 	compiler_test_session.files << os.walk_ext(parent_dir, '_test.v')
 	compiler_test_session.test()
 	eprintln(compiler_test_session.benchmark.total_message('running V tests'))
-
 	eprintln('')
 	building_examples_failed := testing.v_build_failing(vargs, 'examples')
-
 	eprintln('')
-	building_live_failed := testing.v_build_failing(vargs + '-live',
-                                    filepath.join( 'examples', 'hot_reload'))
-
+	building_live_failed := testing.v_build_failing(vargs + '-live', filepath.join('examples','hot_reload'))
 	eprintln('')
 	v_module_install_cmd := '$vexe install nedpals.args'
 	eprintln('\nInstalling a v module with: $v_module_install_cmd ')
@@ -79,24 +65,7 @@ fn v_test_compiler2(vargs string){
 	}
 	vmark.stop()
 	eprintln('Installing a v module took: ' + vmark.total_duration().str() + 'ms')
-
-	make_sure_vfmt_was_run()
-
-	if building_tools_failed ||
-     compiler_test_session.failed ||
-     building_examples_failed ||
-     building_live_failed {
+	if building_tools_failed || compiler_test_session.failed || building_examples_failed || building_live_failed {
 		exit(1)
 	}
-
-}
-
-fn make_sure_vfmt_was_run() {
-	files := os.walk_ext('.', '_test.v')
-	for file in files {
-		println(file)
-		os.exec('./vfmt $file') or {
-			println('$file failed')
-		}
-	}
 }

tools/vtest-fmt.v

@@ -0,0 +1,66 @@
+module main
+
+import (
+	os
+	testing
+	benchmark
+)
+
+fn main() {
+	args := os.args
+	args_string := args[1..].join(' ')
+	v_test_formatting(args_string.all_before('test-fmt'))
+}
+
+fn v_test_formatting(vargs string) {
+	// NB: vfmt have to be build with '-d vfmt' . V itself knows about this,
+	// and v will rebuild tools/vfmt, if it is missing.
+	// Removing the binaries below is needed, since the building tools step
+	// rebuilds all the tools without the special option needed by vfmt
+	// by simply compiling each of them with `v tools/{toolname}.v`
+	// os.rm('tools/vfmt')
+	// os.rm('tools/vfmt.exe')
+	mut files_able_to_be_formatted := []string
+	all_test_files := os.walk_ext('.', '.v')
+	known_failing_exceptions := ['./examples/vweb/vweb_example.v',
+	'./tools/gen_vc.v',
+	'./tutorials/code/blog/article.v',
+	'./tutorials/code/blog/blog.v',
+	'./vlib/arrays/arrays.v',
+	'./vlib/arrays/arrays_test.v',
+	'./vlib/builtin/js/hashmap.v',
+	'./vlib/compiler/tests/fn_variadic_test.v',
+	'./vlib/compiler/tests/generic_test.v',
+	'./vlib/compiler/preludes/live_main.v',
+	'./vlib/compiler/preludes/live_shared.v',
+	'./vlib/compiler/preludes/tests_assertions.v',
+	'./vlib/compiler/preludes/tests_with_stats.v',
+	'./vlib/crypto/aes/aes.v',
+	'./vlib/crypto/aes/aes_cbc.v',
+	'./vlib/crypto/aes/block_generic.v',
+	'./vlib/crypto/aes/const.v',
+	'./vlib/crypto/aes/cypher_generic.v',
+	'./vlib/crypto/rc4/rc4.v',
+	'./vlib/eventbus/eventbus_test.v',
+	'./vlib/flag/flag.v',
+	'./vlib/os/bare/bare_example_linux.v',
+	'./vlib/szip/szip.v',
+	'./vlib/ui/examples/users_gui/users.v',
+	'./vlib/vweb/assets/assets.v',
+	'./vlib/vweb/vweb.v',
+	]
+	for tfile in all_test_files {
+		if tfile in known_failing_exceptions {
+			continue
+		}
+		files_able_to_be_formatted << tfile
+	}
+	eprintln('Run "v fmt" over all .v files')
+	mut vfmt_test_session := testing.new_test_session('$vargs fmt')
+	vfmt_test_session.files << files_able_to_be_formatted
+	vfmt_test_session.test()
+	eprintln(vfmt_test_session.benchmark.total_message('running vfmt over V test files'))
+	if vfmt_test_session.benchmark.nfail > 0 {
+		panic('\nWARNING: v fmt failed ${vfmt_test_session.benchmark.nfail} times.\n')
+	}
+}

v.v

@@ -13,7 +13,7 @@ import (
 
 const (
 	known_commands = ['run', 'build', 'version', 'doc']
-	simple_tools = ['fmt', 'up', 'create', 'test', 'test-compiler', 'build-tools', 'build-examples', 'build-vbinaries']
+	simple_tools = ['fmt', 'up', 'create', 'test', 'test-fmt', 'test-compiler', 'build-tools', 'build-examples', 'build-vbinaries']
 )
 
 fn main() {

vlib/builtin/hashmap/hashmap.v

@@ -36,7 +36,7 @@ const (
 
 const(
 	fnv64_prime        = 1099511628211
-	fnv64_offset_basis = u64(14695981039346656037)
+	fnv64_offset_basis = 14695981039346656037
 )
 
 const(

vlib/os2/keep_vfmt_happy.v

@@ -0,0 +1,2 @@
+//this keeps vfmt happy
+module os2

vlib/sdl/examples/tvintris/tvintris.v

@@ -7,6 +7,7 @@
 
 module main
 
+import filepath
 import rand
 import time
 import os

vlib/sdl/ttf/ttf.v

@@ -1,5 +1,7 @@
 module ttf
 
+import sdl
+
 #include <SDL_ttf.h>
 
 [typedef]
@@ -132,4 +134,5 @@ fn C.TTF_CloseFont(font &TTF_Font)
 
 pub const (
   version = '0.0.1'
+  sdl_version = sdl.version // TODO: remove this hack to mark sdl as used; avoids warning
 )