feat(fmt): add support for configuration file (#11944)

This commit adds support for configuration file for "deno fmt"
subcommand. It is also respected by LSP when formatting
files.

Example configuration:
{
    "fmt": {
        "files": {
            "include": ["src/"],
            "exclude": ["src/testdata/"]
        },
        "options": {
            "useTabs": true,
            "lineWidth": 80,
            "indentWidth": 4,
            "singleQuote": true,
            "textWrap": "preserve"
        }
    }
}

1 files changed, 27 insertions, 4 deletions

diff --git a/cli/tests/integration/fmt_tests.rs b/cli/tests/integration/fmt_tests.rs
index 00565a5d0..2d7451694 100644
--- a/cli/tests/integration/fmt_tests.rs
+++ b/cli/tests/integration/fmt_tests.rs
@@ -129,25 +129,25 @@ fn fmt_ignore_unexplicit_files() {
 }
 
 itest!(fmt_check_tests_dir {
-  args: "fmt --check ./ --ignore=.test_coverage",
+  args: "fmt --check ./ --ignore=.test_coverage,fmt/fmt_with_config/",
   output: "fmt/expected_fmt_check_tests_dir.out",
   exit_code: 1,
 });
 
 itest!(fmt_quiet_check_fmt_dir {
-  args: "fmt --check --quiet fmt/",
+  args: "fmt --check --quiet fmt/regular/",
   output_str: Some(""),
   exit_code: 0,
 });
 
 itest!(fmt_check_formatted_files {
-    args: "fmt --check fmt/formatted1.js fmt/formatted2.ts fmt/formatted3.md fmt/formatted4.jsonc",
+    args: "fmt --check fmt/regular/formatted1.js fmt/regular/formatted2.ts fmt/regular/formatted3.md fmt/regular/formatted4.jsonc",
     output: "fmt/expected_fmt_check_formatted_files.out",
     exit_code: 0,
   });
 
 itest!(fmt_check_ignore {
-  args: "fmt --check --ignore=fmt/formatted1.js fmt/",
+  args: "fmt --check --ignore=fmt/regular/formatted1.js fmt/regular/",
   output: "fmt/expected_fmt_check_ignore.out",
   exit_code: 0,
 });
@@ -181,3 +181,26 @@ itest!(fmt_stdin_check_not_formatted {
   input: Some("const a = 1\n"),
   output_str: Some("Not formatted stdin\n"),
 });
+
+itest!(fmt_with_config {
+  args: "fmt --config fmt/deno.jsonc fmt/fmt_with_config/",
+  output: "fmt/fmt_with_config.out",
+});
+
+// Check if CLI flags take precedence
+itest!(fmt_with_config_and_flags {
+  args: "fmt --config fmt/deno.jsonc --ignore=fmt/fmt_with_config/a.ts,fmt/fmt_with_config/b.ts",
+  output: "fmt/fmt_with_config_and_flags.out",
+});
+
+itest!(fmt_with_malformed_config {
+  args: "fmt --config fmt/deno.malformed.jsonc",
+  output: "fmt/fmt_with_malformed_config.out",
+  exit_code: 1,
+});
+
+itest!(fmt_with_malformed_config2 {
+  args: "fmt --config fmt/deno.malformed2.jsonc",
+  output: "fmt/fmt_with_malformed_config2.out",
+  exit_code: 1,
+});