feat: Add "coder" CLI (#221)

* feat: Add "coder" CLI

* Add CLI test for login

* Add "bin/coder" target to Makefile

* Update promptui to fix race

* Fix error scope

* Don't run CLI tests on Windows

* Fix requested changes

cli/config/file.go

@@ -0,0 +1,71 @@
+package config
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+// Root represents the configuration directory.
+type Root string
+
+func (r Root) Session() File {
+	return File(filepath.Join(string(r), "session"))
+}
+
+func (r Root) URL() File {
+	return File(filepath.Join(string(r), "url"))
+}
+
+func (r Root) Organization() File {
+	return File(filepath.Join(string(r), "organization"))
+}
+
+// File provides convenience methods for interacting with *os.File.
+type File string
+
+// Delete deletes the file.
+func (f File) Delete() error {
+	return os.Remove(string(f))
+}
+
+// Write writes the string to the file.
+func (f File) Write(s string) error {
+	return write(string(f), 0600, []byte(s))
+}
+
+// Read reads the file to a string.
+func (f File) Read() (string, error) {
+	byt, err := read(string(f))
+	return string(byt), err
+}
+
+// open opens a file in the configuration directory,
+// creating all intermediate directories.
+func open(path string, flag int, mode os.FileMode) (*os.File, error) {
+	err := os.MkdirAll(filepath.Dir(path), 0750)
+	if err != nil {
+		return nil, err
+	}
+
+	return os.OpenFile(path, flag, mode)
+}
+
+func write(path string, mode os.FileMode, dat []byte) error {
+	fi, err := open(path, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, mode)
+	if err != nil {
+		return err
+	}
+	defer fi.Close()
+	_, err = fi.Write(dat)
+	return err
+}
+
+func read(path string) ([]byte, error) {
+	fi, err := open(path, os.O_RDONLY, 0)
+	if err != nil {
+		return nil, err
+	}
+	defer fi.Close()
+	return ioutil.ReadAll(fi)
+}

cli/config/file_test.go

@@ -0,0 +1,38 @@
+package config_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/coder/coder/cli/config"
+)
+
+func TestFile(t *testing.T) {
+	t.Parallel()
+
+	t.Run("Write", func(t *testing.T) {
+		t.Parallel()
+		err := config.Root(t.TempDir()).Session().Write("test")
+		require.NoError(t, err)
+	})
+
+	t.Run("Read", func(t *testing.T) {
+		t.Parallel()
+		root := config.Root(t.TempDir())
+		err := root.Session().Write("test")
+		require.NoError(t, err)
+		data, err := root.Session().Read()
+		require.NoError(t, err)
+		require.Equal(t, "test", data)
+	})
+
+	t.Run("Delete", func(t *testing.T) {
+		t.Parallel()
+		root := config.Root(t.TempDir())
+		err := root.Session().Write("test")
+		require.NoError(t, err)
+		err = root.Session().Delete()
+		require.NoError(t, err)
+	})
+}