Support --indentation in the fmt and lint commands

docs/format.markdown

@@ -5,6 +5,7 @@ Formatting
 jsonschema fmt [schemas-or-directories...]
   [--check/-c] [--verbose/-v] [--extension/-e <extension>]
   [--ignore/-i <schemas-or-directories>] [--keep-ordering/-k]
+  [--indentation/-n <spaces>]
 ```
 
 Schemas are code. As such, they are expected follow consistent stylistic
@@ -54,6 +55,12 @@ jsonschema fmt path/to/my/schema_1.json path/to/my/schema_2.json
 jsonschema fmt path/to/my/schema_1.json path/to/my/schema_2.json --keep-ordering
 ```
 
+### Format JSON Schemas in-place while indenting on 4 spaces
+
+```sh
+jsonschema fmt path/to/my/schema_1.json path/to/my/schema_2.json --indentation 4
+```
+
 ### Format every `.json` file in a given directory (recursively)
 
 ```sh

docs/lint.markdown

@@ -6,7 +6,7 @@ jsonschema lint [schemas-or-directories...] [--http/-h] [--fix/-f]
   [--json/-j] [--verbose/-v] [--resolve/-r <schemas-or-directories> ...]
   [--extension/-e <extension>] [--ignore/-i <schemas-or-directories>]
   [--exclude/-x <rule-name>] [--only/-o <rule-name>] [--list/-l]
-  [--default-dialect/-d <uri>] [--strict/-s]
+  [--default-dialect/-d <uri>] [--strict/-s] [--indentation/-n <spaces>]
 ```
 
 JSON Schema is a surprisingly expressive schema language. Like with traditional
@@ -133,6 +133,12 @@ jsonschema lint --extension .schema.json
 jsonschema lint path/to/my/schema.json --fix
 ```
 
+### Fix lint warnings on a single schema while indenting on 4 spaces
+
+```sh
+jsonschema lint path/to/my/schema.json --fix --indentation 4
+```
+
 ### Fix lint warnings on a single schema while preserving keyword ordering
 
 ```sh

src/command_fmt.cc

@@ -11,6 +11,7 @@
 
 auto sourcemeta::jsonschema::cli::fmt(const sourcemeta::core::Options &options)
     -> int {
+  const auto indentation{parse_indentation(options)};
   for (const auto &entry :
        for_each_json(options.positional(), parse_ignore(options),
                      parse_extensions(options))) {
@@ -28,10 +29,11 @@ auto sourcemeta::jsonschema::cli::fmt(const sourcemeta::core::Options &options)
       std::ostringstream expected;
 
       if (options.contains("keep-ordering")) {
-        sourcemeta::core::prettify(entry.second, expected);
+        sourcemeta::core::prettify(entry.second, expected, indentation);
       } else {
         sourcemeta::core::prettify(entry.second, expected,
-                                   sourcemeta::core::schema_format_compare);
+                                   sourcemeta::core::schema_format_compare,
+                                   indentation);
       }
 
       expected << "\n";
@@ -50,10 +52,11 @@ auto sourcemeta::jsonschema::cli::fmt(const sourcemeta::core::Options &options)
       std::ofstream output{entry.first};
 
       if (options.contains("keep-ordering")) {
-        sourcemeta::core::prettify(entry.second, output);
+        sourcemeta::core::prettify(entry.second, output, indentation);
       } else {
         sourcemeta::core::prettify(entry.second, output,
-                                   sourcemeta::core::schema_format_compare);
+                                   sourcemeta::core::schema_format_compare,
+                                   indentation);
       }
 
       output << "\n";

src/command_lint.cc

@@ -192,6 +192,7 @@ auto sourcemeta::jsonschema::cli::lint(const sourcemeta::core::Options &options)
   auto errors_array = sourcemeta::core::JSON::make_array();
   std::vector<std::uint8_t> scores;
   const auto dialect{default_dialect(options)};
+  const auto indentation{parse_indentation(options)};
   const auto custom_resolver{
       resolver(options, options.contains("http"), dialect)};
 
@@ -243,7 +244,7 @@ auto sourcemeta::jsonschema::cli::lint(const sourcemeta::core::Options &options)
       if (wrapper_result == EXIT_SUCCESS) {
         if (copy != entry.second) {
           std::ofstream output{entry.first};
-          sourcemeta::core::prettify(copy, output);
+          sourcemeta::core::prettify(copy, output, indentation);
           output << "\n";
         }
       } else {
@@ -298,7 +299,7 @@ auto sourcemeta::jsonschema::cli::lint(const sourcemeta::core::Options &options)
     }
 
     output_json_object.assign("errors", sourcemeta::core::JSON{errors_array});
-    sourcemeta::core::prettify(output_json_object, std::cout);
+    sourcemeta::core::prettify(output_json_object, std::cout, indentation);
     std::cout << "\n";
   }
 

src/main.cc

@@ -69,20 +69,22 @@ Global Options:
 
    fmt [schemas-or-directories...] [--check/-c] [--extension/-e <extension>]
        [--ignore/-i <schemas-or-directories>] [--keep-ordering/-k]
+       [--indentation/-n <spaces>]
 
        Format the input schemas in-place or check they are formatted.
        This command does not support YAML schemas yet.
 
    lint [schemas-or-directories...] [--fix/-f] [--json/-j]
         [--extension/-e <extension>] [--ignore/-i <schemas-or-directories>]
         [--exclude/-x <rule-name>] [--only/-o <rule-name>] [--list/-l]
-        [--strict/-s]
+        [--strict/-s] [--indentation/-n <spaces>]
 
        Lint the input schemas and potentially fix the reported issues.
        The --fix/-f option is not supported when passing YAML schemas.
        Use --json/-j to output lint errors in JSON.
        Use --list/-l to print a summary of all enabled rules.
        Use --strict/-s to enable additional opinionated strict rules.
+       Use --indentation/-n to keep indentation when auto-fixing
 
    bundle <schema.json|.yaml> [--http/-h] [--extension/-e <extension>]
           [--ignore/-i <schemas-or-directories>] [--without-id/-w]
@@ -120,6 +122,7 @@ auto jsonschema_main(const std::string &program, const std::string &command,
     app.flag("keep-ordering", {"k"});
     app.option("extension", {"e"});
     app.option("ignore", {"i"});
+    app.option("indentation", {"n"});
     app.parse(argc, argv, {.skip = 1});
     return sourcemeta::jsonschema::cli::fmt(app);
   } else if (command == "inspect") {
@@ -141,6 +144,7 @@ auto jsonschema_main(const std::string &program, const std::string &command,
     app.option("exclude", {"x"});
     app.option("only", {"o"});
     app.option("ignore", {"i"});
+    app.option("indentation", {"n"});
     app.parse(argc, argv, {.skip = 1});
     return sourcemeta::jsonschema::cli::lint(app);
   } else if (command == "validate") {

src/utils.cc

@@ -330,4 +330,13 @@ auto default_dialect(const sourcemeta::core::Options &options)
   return std::nullopt;
 }
 
+auto parse_indentation(const sourcemeta::core::Options &options)
+    -> std::size_t {
+  if (options.contains("indentation")) {
+    return std::stoull(std::string{options.at("indentation").front()});
+  }
+
+  return 2;
+}
+
 } // namespace sourcemeta::jsonschema::cli

src/utils.h

@@ -76,6 +76,8 @@ auto parse_ignore(const sourcemeta::core::Options &options)
 auto default_dialect(const sourcemeta::core::Options &options)
     -> std::optional<std::string>;
 
+auto parse_indentation(const sourcemeta::core::Options &options) -> std::size_t;
+
 } // namespace sourcemeta::jsonschema::cli
 
 #endif

test/CMakeLists.txt

@@ -37,6 +37,9 @@ add_jsonschema_test_unix(format_check_single_pass_keep_ordering)
 add_jsonschema_test_unix(format_directory_ignore_directory)
 add_jsonschema_test_unix(format_directory_ignore_file)
 add_jsonschema_test_unix(format_check_single_invalid)
+add_jsonschema_test_unix(format_check_single_fail_indentation)
+add_jsonschema_test_unix(format_check_single_pass_indentation)
+add_jsonschema_test_unix(format_single_indentation)
 
 # Validate
 add_jsonschema_test_unix(validate/fail_instance_directory)
@@ -255,6 +258,7 @@ add_jsonschema_test_unix(lint/fail_lint_default)
 add_jsonschema_test_unix(lint/pass_lint_json)
 add_jsonschema_test_unix(lint/pass_lint_fix_json)
 add_jsonschema_test_unix(lint/pass_lint_fix_strict)
+add_jsonschema_test_unix(lint/pass_lint_fix_indentation)
 add_jsonschema_test_unix(lint/pass_lint_ignore_short)
 add_jsonschema_test_unix(lint/pass_lint_ignore_long)
 add_jsonschema_test_unix(lint/pass_lint_examples_fix)

test/format_check_single_fail_indentation.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+TMP="$(mktemp -d)"
+clean() { rm -rf "$TMP"; }
+trap clean EXIT
+
+cat << 'EOF' > "$TMP/schema.json"
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": 1
+}
+EOF
+
+"$1" fmt "$TMP/schema.json" --indentation 4 --check 2>"$TMP/stderr.txt" && CODE="$?" || CODE="$?"
+test "$CODE" = "1" || exit 1
+
+cat << EOF > "$TMP/error.txt"
+FAIL: $(realpath "$TMP")/schema.json
+Got:
+{
+  "\$schema": "http://json-schema.org/draft-04/schema#",
+  "type": 1
+}
+
+But expected:
+{
+    "\$schema": "http://json-schema.org/draft-04/schema#",
+    "type": 1
+}
+
+EOF
+
+diff "$TMP/stderr.txt" "$TMP/error.txt"
+
+cat << 'EOF' > "$TMP/expected.json"
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": 1
+}
+EOF
+
+diff "$TMP/schema.json" "$TMP/expected.json"

test/format_check_single_pass_indentation.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+TMP="$(mktemp -d)"
+clean() { rm -rf "$TMP"; }
+trap clean EXIT
+
+cat << 'EOF' > "$TMP/schema.json"
+{
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "type": 1
+}
+EOF
+
+"$1" fmt "$TMP/schema.json" --check --indentation 4
+
+cat << 'EOF' > "$TMP/expected.json"
+{
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "type": 1
+}
+EOF
+
+diff "$TMP/schema.json" "$TMP/expected.json"

test/format_single_indentation.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+TMP="$(mktemp -d)"
+clean() { rm -rf "$TMP"; }
+trap clean EXIT
+
+cat << 'EOF' > "$TMP/schema.json"
+{
+  "additionalProperties": false,
+  "title": "Hello World",
+  "properties": {"foo": {}, "bar": {}}
+}
+EOF
+
+"$1" fmt "$TMP/schema.json" --indentation 4
+
+cat << 'EOF' > "$TMP/expected.json"
+{
+    "title": "Hello World",
+    "properties": {
+        "bar": {},
+        "foo": {}
+    },
+    "additionalProperties": false
+}
+EOF
+
+diff "$TMP/schema.json" "$TMP/expected.json"

test/lint/pass_lint_fix_indentation.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+TMP="$(mktemp -d)"
+clean() { rm -rf "$TMP"; }
+trap clean EXIT
+
+cat << 'EOF' > "$TMP/schema.json"
+{
+  "$schema": "http://json-schema.org/draft-06/schema#",
+  "type": "string",
+  "const": "foo",
+  "title": "I should not be moved up"
+}
+EOF
+
+"$1" lint "$TMP/schema.json" --fix --indentation 4
+
+cat << 'EOF' > "$TMP/expected.json"
+{
+    "$schema": "http://json-schema.org/draft-06/schema#",
+    "const": "foo",
+    "title": "I should not be moved up"
+}
+EOF
+
+diff "$TMP/schema.json" "$TMP/expected.json"