caddyconfig: Fix indentation of multiline strings in fmt (#7425) (#7433)

caddyconfig/caddyfile/formatter.go

@@ -18,6 +18,7 @@ import (
 	"bytes"
 	"io"
 	"slices"
+	"strings"
 	"unicode"
 )
 
@@ -209,6 +210,15 @@ func Format(input []byte) []byte {
 			}
 		}
 
+		if strings.Contains(quotes, "`") {
+			if ch == '`' && space && !beginningOfLine {
+				write(' ')
+			}
+			write(ch)
+			space = false
+			continue
+		}
+
 		if unicode.IsSpace(ch) {
 			space = true
 			heredocEscaped = false

caddyconfig/caddyfile/formatter_test.go

@@ -464,6 +464,17 @@ block2 {
 }
 `,
 		},
+		{
+			description: "issue #7425: multiline backticked string indentation",
+			input: `https://localhost:8953 {
+    respond ` + "`" + `Here are some random numbers:
+
+{{randNumeric 16}}
+
+Hope this helps.` + "`" + `
+}`,
+			expect: "https://localhost:8953 {\n\trespond `Here are some random numbers:\n\n{{randNumeric 16}}\n\nHope this helps.`\n}",
+		},
 	} {
 		// the formatter should output a trailing newline,
 		// even if the tests aren't written to expect that