Finish porting SSH config file parsing

tools/cmd/ssh/config_test.go

@@ -0,0 +1,76 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package ssh
+
+import (
+	"fmt"
+	"kitty/tools/utils"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+var _ = fmt.Print
+
+func TestSSHConfigParsing(t *testing.T) {
+	tdir := t.TempDir()
+	hostname := "unmatched"
+	username := ""
+	conf := ""
+	for_python := false
+	rt := func(expected_env ...string) {
+		cf := filepath.Join(tdir, "ssh.conf")
+		os.WriteFile(cf, []byte(conf), 0o600)
+		c, err := load_config(hostname, username, nil, cf)
+		if err != nil {
+			t.Fatal(err)
+		}
+		actual := c.final_env_instructions(for_python, func(key string) (string, bool) {
+			if key == "LOCAL_ENV" {
+				return "LOCAL_VAL", true
+			}
+			return "", false
+		})
+		if expected_env == nil {
+			expected_env = []string{}
+		}
+		diff := cmp.Diff(expected_env, utils.Splitlines(actual))
+		if diff != "" {
+			t.Fatalf("Unexpected env for\nhostname: %#v\nusername: %#v\nconf: %s\n%s", hostname, username, conf, diff)
+		}
+	}
+	rt()
+	conf = "env a=b"
+	rt(`export 'a'="b"`)
+	conf = "env a=b\nhostname 2\nenv a=c\nenv b=b"
+	rt(`export 'a'="b"`)
+	hostname = "2"
+	rt(`export 'a'="c"`, `export 'b'="b"`)
+	conf = "env a="
+	rt(`export 'a'=""`)
+	conf = "env a"
+	rt(`unset 'a'`)
+	conf = "env a=b\nhostname test@2\nenv a=c\nenv b=b"
+	hostname = "unmatched"
+	rt(`export 'a'="b"`)
+	hostname = "2"
+	rt(`export 'a'="b"`)
+	username = "test"
+	rt(`export 'a'="c"`, `export 'b'="b"`)
+	conf = "env a=b\nhostname 1 2\nenv a=c\nenv b=b"
+	username = ""
+	hostname = "unmatched"
+	rt(`export 'a'="b"`)
+	hostname = "1"
+	rt(`export 'a'="c"`, `export 'b'="b"`)
+	hostname = "2"
+	rt(`export 'a'="c"`, `export 'b'="b"`)
+	for_python = true
+	rt(`export ["a","c",false]`, `export ["b","b",false]`)
+	conf = "env a="
+	rt(`export ["a"]`)
+	conf = "env a"
+	rt(`unset ["a"]`)
+}