From f251231590b188681b33705feaf5156d88f09197 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=96zg=C3=BCr=20Kesim?= <oec@codeblau.de>
Date: Tue, 28 Jul 2015 17:12:26 +0200
Subject: [PATCH] added sysctl for terminal-width retrieval

---
 dict.go    | 15 ++++++++++++---
 winsize.go | 29 +++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 3 deletions(-)
 create mode 100644 winsize.go

diff --git a/dict.go b/dict.go
index f1d3a01..20b109b 100644
--- a/dict.go
+++ b/dict.go
@@ -16,6 +16,9 @@ const (
 	SUFF = ");"
 )
 
+// is going to be set in winsize.go, if run on unix
+var Width = 80
+
 func main() {
 	if len(os.Args) < 2 || os.Args[1][0] == '-' {
 		println("usage:", os.Args[0], "word [{de|es|fr|en...}{de|es|fr|en|...}]")
@@ -59,7 +62,7 @@ func main() {
 		return
 	}
 
-	ml := 5
+	ml := 25
 
 	for _, v := range right {
 		if len(v) > ml {
@@ -67,8 +70,8 @@ func main() {
 		}
 	}
 
-	if ml > 40 {
-		ml = 40
+	if ml > (Width / 2) {
+		ml = Width / 2
 	}
 
 	re := regexp.MustCompile(`\\(['"„])`)
@@ -86,6 +89,12 @@ func main() {
 				a = a[i:]
 			}
 		}
+		if len(b) > ml {
+			if i := strings.LastIndex(b[:ml], " "); i > 0 {
+				fmt.Printf("%*s\n", ml, a[:i])
+				a = a[i:]
+			}
+		}
 
 		// TODO: wrap when len(a) > ml
 		fmt.Printf("%*s → %s\n", ml, a, b)
diff --git a/winsize.go b/winsize.go
new file mode 100644
index 0000000..1a3bdaf
--- /dev/null
+++ b/winsize.go
@@ -0,0 +1,29 @@
+package main
+
+// +build linux
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+type winsize struct {
+	Row    uint16
+	Col    uint16
+	Xpixel uint16
+	Ypixel uint16
+}
+
+func init() {
+	ws := &winsize{}
+	retCode, _, errno := syscall.Syscall(syscall.SYS_IOCTL,
+		uintptr(syscall.Stdin),
+		uintptr(syscall.TIOCGWINSZ),
+		uintptr(unsafe.Pointer(ws)))
+
+	if int(retCode) == -1 {
+		panic(errno)
+	}
+
+	Width = int(ws.Col)
+}