From 0b05522b0545ece987ea99288eae3f36bcf36315 Mon Sep 17 00:00:00 2001
From: Timothy Warren <tim@timshomepage.net>
Date: Fri, 19 Mar 2021 16:36:02 -0400
Subject: [PATCH] Add modules

---
 internal/editor/editor.go     |  1 +
 internal/rune/rune.go         | 29 +++++++++++++++++++++++++++++
 internal/terminal/terminal.go | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+)
 create mode 100644 internal/editor/editor.go
 create mode 100644 internal/rune/rune.go
 create mode 100644 internal/terminal/terminal.go

diff --git a/internal/editor/editor.go b/internal/editor/editor.go
new file mode 100644
index 0000000..323df60
--- /dev/null
+++ b/internal/editor/editor.go
@@ -0,0 +1 @@
+package editor
diff --git a/internal/rune/rune.go b/internal/rune/rune.go
new file mode 100644
index 0000000..6213577
--- /dev/null
+++ b/internal/rune/rune.go
@@ -0,0 +1,29 @@
+package rune
+
+func isAscii(char rune) bool {
+	ord := int(char)
+
+	return ord < 0x80
+}
+
+func IsCtrl(char rune) bool {
+	if !isAscii(char) {
+		return false
+	}
+
+	ord := int(char)
+
+	return ord == 0x7f || ord < 0x20
+}
+
+// Return the input code of a Ctrl-key chord.
+func Ctrl(char rune) rune {
+	ord := int(char)
+	raw := ord & 0x1f
+
+	if !IsCtrl(rune(raw)) {
+		return 0
+	}
+
+	return rune(raw)
+}
diff --git a/internal/terminal/terminal.go b/internal/terminal/terminal.go
new file mode 100644
index 0000000..df66c86
--- /dev/null
+++ b/internal/terminal/terminal.go
@@ -0,0 +1,32 @@
+package terminal
+
+import (
+	"fmt"
+	"golang.org/x/term"
+	"os"
+)
+
+// Put the terminal in raw mode
+func RawOn() *term.State {
+	oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
+	if err != nil {
+		panic(err)
+	}
+
+	return oldState
+}
+
+// Restore the terminal to canonical mode
+func RawOff(oldState *term.State) {
+	err := term.Restore(int(os.Stdin.Fd()), oldState)
+	if err != nil {
+		panic(err)
+	}
+}
+
+// Print a formatted string to stdout, with CRLF line endings for proper terminal formatting
+func OutLn(format string, a ...interface{}) {
+	formatted := fmt.Sprintf(format, a...)
+
+	fmt.Printf("%s\r\n", formatted)
+}
\ No newline at end of file