fixup! Add word-wrap support based on terminal size

try using low-level platform-specific implementation

go.mod

@@ -6,5 +6,6 @@ require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d
 	golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79
+	golang.org/x/sys v0.0.0-20190412213103-97732733099d
 	gopkg.in/yaml.v2 v2.2.2
 )

help.go

@@ -8,8 +8,6 @@ import (
 	"text/tabwriter"
 	"text/template"
 	"unicode/utf8"
-
-	"golang.org/x/crypto/ssh/terminal"
 )
 
 var helpCommand = &Command{
@@ -269,7 +267,7 @@ func printHelpCustom(out io.Writer, templ string, data interface{}, customFuncs
 		return input
 	}
 
-	width, _, err := terminal.GetSize(int(os.Stdout.Fd()))
+	width, err := termWidth()
 	if err != nil && width > 0 {
 		wrapFunc = func(input string, offset int) string {
 			return wrap(input, offset, width)

internal/build/build.go

@@ -194,7 +194,7 @@ func checkBinarySizeActionFunc(c *cli.Context) (err error) {
 		helloSourceFilePath  = "./internal/example-hello-world/example-hello-world.go"
 		helloBuiltFilePath   = "./internal/example-hello-world/built-example"
 		desiredMinBinarySize = 2.0
-		desiredMaxBinarySize = 2.2
+		desiredMaxBinarySize = 2.1
 		badNewsEmoji         = "🚨"
 		goodNewsEmoji        = "✨"
 		checksPassedEmoji    = "✅"

termwidth_misc.go

@@ -0,0 +1,21 @@
+// +build !aix
+// +build !darwin
+// +build !dragonfly
+// +build !freebsd
+// +build !linux,!appengine
+// +build !netbsd
+// +build !openbsd
+// +build !windows
+
+// The build constraints above are intended to be the negation of the
+// single-line constraint in termwidth_unix.go and also !windows.
+
+package cli
+
+import (
+	"errors"
+)
+
+func termWidth() (int, error) {
+	return -1, errors.New("Unsupported platform")
+}

termwidth_unix.go

@@ -0,0 +1,19 @@
+// +build aix darwin dragonfly freebsd linux,!appengine netbsd openbsd
+// Only tested on linux and darwin so far...
+
+package cli
+
+import (
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+func termWidth() (int, error) {
+	ws, err := unix.IoctlGetWinsize(int(os.Stdout.Fd()), unix.TIOCGWINSZ)
+	if err != nil {
+		return -1, err
+	}
+
+	return int(ws.Col), nil
+}

termwidth_windows.go

@@ -0,0 +1,18 @@
+package cli
+
+import (
+	"golang.org/x/sys/windows"
+)
+
+func termWidth() (int, error) {
+	var info windows.ConsoleScreenBufferInfo
+
+	// This seems to work in cmd.exe, powershell and cmder, but not in
+	// git-bash. (Tested on windows 10.)
+	err = windows.GetConsoleScreenBufferInfo(windows.Stdout, &info)
+	if err != nil {
+		return -1, err
+	}
+
+	return int(info.Size.X), nil
+}