vdoc: fix 'module, comment, import' sequence bug

cmd/tools/vdoc.v

@@ -403,6 +403,9 @@ fn (cfg DocConfig) gen_plaintext(idx int) string {
 	dcs := cfg.docs[idx]
 	mut pw := strings.new_builder(200)
 	pw.writeln('${dcs.head.content}\n')
+	if dcs.head.comment.len > 0 {
+		pw.writeln('// ' + dcs.head.comment.replace('\n', '\n// ') + '\n')
+	}
 	for cn in dcs.contents {
 		pw.writeln(cn.content)
 		if cn.comment.len > 0 {
@@ -553,8 +556,12 @@ fn (mut cfg DocConfig) generate_docs_from_file() {
 	cfg.vprintln('Rendering docs...')
 	if cfg.output_path.len == 0 {
 		outputs := cfg.render()
-		first := outputs.keys()[0]
-		println(outputs[first])
+		if outputs.size == 0 {
+			println('No documentation for $dirs')
+		} else {
+			first := outputs.keys()[0]
+			println(outputs[first])
+		}
 	} else {
 		if !os.is_dir(cfg.output_path) {
 			cfg.output_path = os.real_path('.')

vlib/v/doc/doc.v

@@ -40,6 +40,17 @@ pub mut:
 	parent_type string = ''
 }
 
+pub fn merge_comments(stmts []ast.Stmt) string {
+	mut res := []string{}
+	for s in stmts {
+		if s is ast.Comment {
+			c  := s as ast.Comment
+			res << c.text.trim_left('|')
+		}
+	}
+	return res.join('\n')
+}
+
 pub fn get_comment_block_right_before(stmts []ast.Stmt) string {
 	if stmts.len == 0 {
 		return ''
@@ -263,9 +274,17 @@ pub fn (mut d Doc) generate() ?bool {
 		} else if file_ast.mod.name != orig_mod_name {
 			continue
 		}
-		mut prev_comments := []ast.Stmt{}
 		stmts := file_ast.stmts
-		for o, stmt in stmts {
+		//
+		mut last_import_stmt_idx := 0
+		for sidx, stmt in stmts {
+			if stmt is ast.Import {
+				last_import_stmt_idx = sidx
+			}
+		}
+		mut prev_comments := []ast.Stmt{}
+		mut imports_section := true
+		for sidx, stmt in stmts {
 			//eprintln('stmt typeof: ' + typeof(stmt))
 			if stmt is ast.Comment {
 				prev_comments << stmt
@@ -287,6 +306,20 @@ pub fn (mut d Doc) generate() ?bool {
 				d.head.comment += module_comment
 				continue
 			}
+			if last_import_stmt_idx > 0 && sidx == last_import_stmt_idx {
+				// the accumulated comments were interspersed before/between the imports;
+				// just add them all to the module comment:
+				import_comments := merge_comments(prev_comments)
+				if d.head.comment != '' {
+					d.head.comment += '\n'
+				}
+				d.head.comment += import_comments
+				prev_comments = []
+				imports_section = false
+			}
+			if stmt is ast.Import {
+				continue
+			}
 			signature := d.get_signature(stmt)
 			pos := d.get_pos(stmt)
 			mut name := d.get_name(stmt)
@@ -316,7 +349,7 @@ pub fn (mut d Doc) generate() ?bool {
 			}
 			if stmt is ast.ConstDecl {
 				if const_idx == -1 {
-					const_idx = o
+					const_idx = sidx
 				} else {
 					node.parent_type = 'Constants'
 				}

vlib/v/parser/parser.v

@@ -129,8 +129,16 @@ fn (mut p Parser) parse() ast.File {
 	module_decl := p.module_decl()
 	stmts << module_decl
 	// imports
-	for p.tok.kind == .key_import {
-		stmts << p.import_stmt()
+	for {
+		if p.tok.kind == .key_import {
+			stmts << p.import_stmt()
+			continue
+		}
+		if p.tok.kind == .comment {
+			stmts << p.comment()
+			continue
+		}
+		break
 	}
 	for {
 		if p.tok.kind == .eof {