From 2c28621c2228b30f2f27a60db1e9a30da3e4c16f Mon Sep 17 00:00:00 2001
From: Max Horn <max@quendi.de>
Date: Mon, 9 Apr 2018 23:59:37 +0200
Subject: [PATCH] io: change prompt after line continuation

This ensures that line continuations inside of e.g. integer and float
expressions properly show a line continuation prompt.

Fixes #1992
---
 src/io.c                             |  8 +++++++-
 tst/testinstall/linecontinuation.tst | 13 +++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/io.c b/src/io.c
index dd9ac0742f..1ec98676bd 100644
--- a/src/io.c
+++ b/src/io.c
@@ -201,8 +201,14 @@ Char GET_NEXT_CHAR(void)
     while (*STATE(In) == '\\' || *STATE(In) == 0) {
         if (!*STATE(In))
             GetLine();
-        else if (STATE(In)[1] == '\n')
+        else if (STATE(In)[1] == '\n') {
             STATE(In) += 2;
+            // print only a partial prompt from now on
+            if (!SyQuiet)
+                STATE(Prompt) = "> ";
+            else
+                STATE(Prompt) = "";
+        }
         else if (STATE(In)[1] == '\r')
             STATE(In) += (STATE(In)[2] == '\n') ? 3 : 2;
         else
diff --git a/tst/testinstall/linecontinuation.tst b/tst/testinstall/linecontinuation.tst
index ee4e62eaa6..651c687b0b 100644
--- a/tst/testinstall/linecontinuation.tst
+++ b/tst/testinstall/linecontinuation.tst
@@ -35,6 +35,19 @@ gap> {x.\
 > ..}->x;
 function( x... ) ... end
 
+# inside float expressions
+gap> 1.2e\
+> 0;
+1.2
+gap> 1.1\
+> ;
+1.1
+
+# inside integer expressions
+gap> 12\
+> 3;
+123
+
 # however, in comments, you cannot use line continuations:
 gap> # 1234\
 gap> 5;