From 04ff9ede9fb04f9ed51ee3d9fd4e1e5e72705919 Mon Sep 17 00:00:00 2001
From: Henrixounez <30901439+Henrixounez@users.noreply.github.com>
Date: Sun, 15 Sep 2019 03:33:31 +0200
Subject: [PATCH] readline: allow writing without tty + small fixes

---
 vlib/readline/readline_lin.v | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/vlib/readline/readline_lin.v b/vlib/readline/readline_lin.v
index 6bfb320484..bb5214cd9f 100644
--- a/vlib/readline/readline_lin.v
+++ b/vlib/readline/readline_lin.v
@@ -42,6 +42,7 @@ mut:
   prompt string
   previous_lines []string
   search_index int
+  is_tty bool
 }
 
 
@@ -69,7 +70,8 @@ enum Action {
 // Toggle raw mode of the terminal by changing its attributes
 pub fn (r mut Readline) enable_raw_mode() {
   if ( C.tcgetattr(0, &r.orig_termios) == -1 ) {
-    panic('No tty')
+    r.is_tty = false
+    return
   }
   mut raw := r.orig_termios
   raw.c_iflag &= ~( C.BRKINT | C.ICRNL | C.INPCK | C.ISTRIP | C.IXON )
@@ -79,12 +81,14 @@ pub fn (r mut Readline) enable_raw_mode() {
   raw.c_cc[C.VTIME] = 0
   C.tcsetattr(0, C.TCSADRAIN, &raw)
   r.is_raw = true
+  r.is_tty = true
 }
 
 // Not catching the SIGUSER (CTRL+C) Signal
-pub fn (r Readline) enable_raw_mode2() {
+pub fn (r mut Readline) enable_raw_mode2() {
   if ( C.tcgetattr(0, &r.orig_termios) == -1 ) {
-    panic('No tty')
+    r.is_tty = false
+    return
   }
   mut raw := r.orig_termios
   raw.c_iflag &= ~( C.BRKINT | C.ICRNL | C.INPCK | C.ISTRIP | C.IXON )
@@ -93,6 +97,8 @@ pub fn (r Readline) enable_raw_mode2() {
   raw.c_cc[C.VMIN] = 1
   raw.c_cc[C.VTIME] = 0
   C.tcsetattr(0, C.TCSADRAIN, &raw)
+  r.is_raw = true
+  r.is_tty = true
 }
 
 // Reset back the terminal to its default value
@@ -224,8 +230,8 @@ fn (r mut Readline) execute(a Action, c byte) bool {
 
 fn get_screen_columns() int {
   ws := winsize{}
-  cols := if C.ioctl(1, C.TIOCGWINSZ, &ws) == -1 { 80 } else { ws.ws_col }
-  return int(cols)
+  cols := if C.ioctl(1, C.TIOCGWINSZ, &ws) == -1 { 80 } else { int(ws.ws_col) }
+  return cols
 }
 
 fn shift_cursor(xpos int, yoffset int) {
@@ -299,7 +305,9 @@ fn (r mut Readline) insert_character(c byte) {
   }
   r.cursor++
   // Refresh the line to add the new character
-  r.refresh_line()
+  if r.is_tty {
+    r.refresh_line()
+  }
 }
 
 // Removes the character behind cursor.
@@ -325,7 +333,9 @@ fn (r mut Readline) suppr_character() {
 fn (r mut Readline) commit_line() bool {
   r.previous_lines.insert(1, r.current)
   r.current = r.current + '\n'
-  println('')
+  if r.is_tty {
+    println('')
+  }
   return true
 }