From 085a09ebdbf20a7dcce4b43c45245fc5aec6121f Mon Sep 17 00:00:00 2001
From: yuyi <yuyi98@163.com>
Date: Sat, 17 Sep 2022 20:58:53 +0800
Subject: [PATCH] vrepl: fix output error of print and fn call (#15796)

---
 cmd/tools/vrepl.v                        | 10 ++++++++--
 vlib/v/tests/repl/print_and_fn_call.repl | 10 ++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 vlib/v/tests/repl/print_and_fn_call.repl

diff --git a/cmd/tools/vrepl.v b/cmd/tools/vrepl.v
index b107ef7dcd..aa92f4ad90 100644
--- a/cmd/tools/vrepl.v
+++ b/cmd/tools/vrepl.v
@@ -390,7 +390,10 @@ fn run_repl(workdir string, vrepl_prefix string) int {
 			source_code := r.current_source_code(false, false) + '\n$r.line\n'
 			os.write_file(temp_file, source_code) or { panic(err) }
 			s := repl_run_vfile(temp_file) or { return 1 }
-			print_output(s.output)
+			if s.output.len > r.last_output.len {
+				cur_line_output := s.output[r.last_output.len..]
+				print_output(cur_line_output)
+			}
 		} else {
 			mut temp_line := r.line
 			func_call, fntype := r.function_call(r.line)
@@ -441,7 +444,10 @@ fn run_repl(workdir string, vrepl_prefix string) int {
 				source_code := r.current_source_code(false, false) + '\n$temp_line\n'
 				os.write_file(temp_file, source_code) or { panic(err) }
 				s := repl_run_vfile(temp_file) or { return 1 }
-				print_output(s.output)
+				if s.output.len > r.last_output.len {
+					cur_line_output := s.output[r.last_output.len..]
+					print_output(cur_line_output)
+				}
 				continue
 			}
 			mut temp_source_code := ''
diff --git a/vlib/v/tests/repl/print_and_fn_call.repl b/vlib/v/tests/repl/print_and_fn_call.repl
new file mode 100644
index 0000000000..5e02ef33c7
--- /dev/null
+++ b/vlib/v/tests/repl/print_and_fn_call.repl
@@ -0,0 +1,10 @@
+println('hello')
+fn abc(x int) { println(x) }
+abc(123)
+abc(456)
+println('hello')
+===output===
+hello
+123
+456
+hello