Implement an --extension/-e option to prefer custom file extensions

docs/bundle.markdown

@@ -2,7 +2,8 @@ Bundling
 ========
 
 ```sh
-jsonschema bundle <schema.json> [--http/-h] [--verbose/-v] [--resolve/-r <schema.json> ...]
+jsonschema bundle <schema.json>
+  [--http/-h] [--verbose/-v] [--resolve/-r <schema.json> ...]
 ```
 
 A schema may contain references to remote schemas outside the scope of the

docs/format.markdown

@@ -2,7 +2,8 @@ Formatting
 ==========
 
 ```sh
-jsonschema fmt [schemas-or-directories...] [--check|-c] [--verbose/-v]
+jsonschema fmt [schemas-or-directories...]
+  [--check/-c] [--verbose/-v] [--extension/-e <extension>]
 ```
 
 Schemas are code. As such, they are expected follow consistent stylistic
@@ -56,6 +57,12 @@ jsonschema fmt path/to/schemas/
 jsonschema fmt
 ```
 
+### Format every `.schema.json` file in the current directory (recursively)
+
+```sh
+jsonschema fmt --extension .schema.json
+```
+
 ### Check that a single JSON Schema is properly formatted
 
 ```sh

docs/lint.markdown

@@ -2,7 +2,8 @@ Linting
 =======
 
 ```sh
-jsonschema lint [schemas-or-directories...] [--fix|-f] [--verbose/-v]
+jsonschema lint [schemas-or-directories...]
+  [--fix/-f] [--verbose/-v] [--extension/-e <extension>]
 ```
 
 JSON Schema is a surprisingly expressive schema language. Like with traditional
@@ -61,6 +62,12 @@ jsonschema lint path/to/schemas/
 jsonschema lint
 ```
 
+### Lint every `.schema.json` file in the current directory (recursively)
+
+```sh
+jsonschema lint --extension .schema.json
+```
+
 ### Fix lint warnings on a single schema
 
 ```sh

docs/test.markdown

@@ -6,7 +6,9 @@ Testing
 > to support *every* dialect of JSON Schema from Draft 0 to Draft 2020-12 soon.
 
 ```sh
-jsonschema test [schemas-or-directories...] [--http/-h] [--metaschema/-m] [--verbose/-v] [--resolve/-r <schema.json> ...]
+jsonschema test [schemas-or-directories...]
+  [--http/-h] [--metaschema/-m] [--verbose/-v] [--resolve/-r <schema.json> ...]
+  [--extension/-e <extension>]
 ```
 
 Schemas are code. As such, you should run an automated unit testing suite
@@ -66,6 +68,12 @@ jsonschema test path/to/tests/
 jsonschema test
 ```
 
+### Run every `.test.json` test definition in the current directory (recursively)
+
+```sh
+jsonschema test --extension .test.json
+```
+
 ### Run a single test definition validating the schemas against their metaschemas
 
 ```sh

docs/validate.markdown

@@ -6,7 +6,8 @@ Validating
 > to support *every* dialect of JSON Schema from Draft 0 to Draft 2020-12 soon.
 
 ```sh
-jsonschema validate <schema.json> [instance.json] [--http/-h] [--metaschema/-m] [--verbose/-v] [--resolve/-r <schema.json> ...]
+jsonschema validate <schema.json>
+  [instance.json] [--http/-h] [--metaschema/-m] [--verbose/-v] [--resolve/-r <schema.json> ...]
 ```
 
 The most popular use case of JSON Schema is to validate JSON documents. The
@@ -53,7 +54,7 @@ jsonschema validate path/to/my/schema.json path/to/my/instance.json
 ### Validate a JSON Schema against it meta-schema
 
 ```sh
-jsonschema validate path/to/my/schema.json 
+jsonschema validate path/to/my/schema.json
 ```
 
 ### Validate a JSON instance against a schema plus the schema against its meta-schema

src/command_fmt.cc

@@ -13,7 +13,8 @@ auto intelligence::jsonschema::cli::fmt(
     const std::span<const std::string> &arguments) -> int {
   const auto options{parse_options(arguments, {"c", "check"})};
 
-  for (const auto &entry : for_each_json(options.at(""))) {
+  for (const auto &entry :
+       for_each_json(options.at(""), parse_extensions(options))) {
     if (options.contains("c") || options.contains("check")) {
       log_verbose(options) << "Checking: " << entry.first.string() << "\n";
       std::ifstream input{entry.first};

src/command_lint.cc

@@ -21,7 +21,8 @@ auto intelligence::jsonschema::cli::lint(
   bool result{true};
 
   if (options.contains("f") || options.contains("fix")) {
-    for (const auto &entry : for_each_json(options.at(""))) {
+    for (const auto &entry :
+         for_each_json(options.at(""), parse_extensions(options))) {
       log_verbose(options) << "Linting: " << entry.first.string() << "\n";
       auto copy = entry.second;
       bundle.apply(copy, sourcemeta::jsontoolkit::default_schema_walker,
@@ -32,7 +33,8 @@ auto intelligence::jsonschema::cli::lint(
       output << std::endl;
     }
   } else {
-    for (const auto &entry : for_each_json(options.at(""))) {
+    for (const auto &entry :
+         for_each_json(options.at(""), parse_extensions(options))) {
       log_verbose(options) << "Linting: " << entry.first.string() << "\n";
       const bool subresult = bundle.check(
           entry.second, sourcemeta::jsontoolkit::default_schema_walker,

src/command_test.cc

@@ -15,7 +15,8 @@ auto intelligence::jsonschema::cli::test(
   const auto test_resolver{
       resolver(options, options.contains("h") || options.contains("http"))};
 
-  for (const auto &entry : for_each_json(options.at(""))) {
+  for (const auto &entry :
+       for_each_json(options.at(""), parse_extensions(options))) {
     const sourcemeta::jsontoolkit::JSON test{
         sourcemeta::jsontoolkit::from_file(entry.first)};
     CLI_ENSURE(test.is_object(), "The test document must be an object")

src/main.cc

@@ -30,30 +30,37 @@ Global Options:
        was passed.
 
    test [schemas-or-directories...] [--http/-h] [--metaschema/-m]
+        [--extension/-e <extension>]
 
        A schema test runner inspired by the official JSON Schema test suite.
        Passing directories as input will run every `.json` file in such
        directory (recursively) as a test. If no argument is passed, run every
        `.json` file in the current working directory (recursively) as a test.
-      The `--http/-h` option enables resolving remote schemas over the HTTP
-      protocol. The `--metaschema/-m` option checks that the given schema is
-      valid with respects to its dialect metaschema.
+       The `--http/-h` option enables resolving remote schemas over the HTTP
+       protocol. The `--metaschema/-m` option checks that the given schema is
+       valid with respects to its dialect metaschema. When scanning
+       directories, the `--extension/-e` option is used to prefer a file
+       extension other than `.json`. This option can be set multiple times.
 
-   fmt [schemas-or-directories...] [--check/-c]
+   fmt [schemas-or-directories...] [--check/-c] [--extension/-e <extension>]
 
        Format the input schemas in-place. Passing directories as input means
        to format every `.json` file in such directory (recursively). If no
        argument is passed, format every `.json` file in the current working
        directory (recursively). The `--check/-c` option will check if the given
-       schemas adhere to the desired formatting without modifying them.
+       schemas adhere to the desired formatting without modifying them. When
+       scanning directories, the `--extension/-e` option is used to prefer a
+       file extension other than `.json`. This option can be set multiple times.
 
-   lint [schemas-or-directories...] [--fix/-f]
+   lint [schemas-or-directories...] [--fix/-f] [--extension/-e <extension>]
 
        Lint the input schemas. Passing directories as input means to lint
        every `.json` file in such directory (recursively). If no argument is
        passed, lint every `.json` file in the current working directory
        (recursively). The `--fix/-f` option will attempt to automatically
-       fix the linter errors.
+       fix the linter errors. When scanning directories, the `--extension/-e`
+       option is used to prefer a file extension other than `.json`. This option
+       can be set multiple times.
 
    bundle <schema.json> [--http/-h]
 

src/utils.cc

@@ -5,24 +5,30 @@
 
 #include "utils.h"
 
+#include <algorithm> // std::any_of
 #include <cassert>   // assert
 #include <fstream>   // std::ofstream
 #include <iostream>  // std::cerr
 #include <optional>  // std::optional, std::nullopt
+#include <set>       // std::set
 #include <sstream>   // std::ostringstream
 #include <stdexcept> // std::runtime_error
 
 namespace {
 
 auto handle_json_entry(
     const std::filesystem::path &entry_path,
+    const std::set<std::string> &extensions,
     std::vector<std::pair<std::filesystem::path, sourcemeta::jsontoolkit::JSON>>
         &result) -> void {
   if (std::filesystem::is_directory(entry_path)) {
     for (auto const &entry :
          std::filesystem::recursive_directory_iterator{entry_path}) {
       if (!std::filesystem::is_directory(entry) &&
-          entry.path().extension() == ".json") {
+          std::any_of(extensions.cbegin(), extensions.cend(),
+                      [&entry](const auto &extension) {
+                        return entry.path().string().ends_with(extension);
+                      })) {
         result.emplace_back(entry.path(),
                             sourcemeta::jsontoolkit::from_file(entry.path()));
       }
@@ -34,26 +40,42 @@ auto handle_json_entry(
       throw std::runtime_error(error.str());
     }
 
-    result.emplace_back(entry_path,
-                        sourcemeta::jsontoolkit::from_file(entry_path));
+    if (std::any_of(extensions.cbegin(), extensions.cend(),
+                    [&entry_path](const auto &extension) {
+                      return entry_path.string().ends_with(extension);
+                    })) {
+      result.emplace_back(entry_path,
+                          sourcemeta::jsontoolkit::from_file(entry_path));
+    }
   }
 }
 
+auto normalize_extension(const std::string &extension) -> std::string {
+  if (extension.starts_with('.')) {
+    return extension;
+  }
+
+  std::ostringstream result;
+  result << '.' << extension;
+  return result.str();
+}
+
 } // namespace
 
 namespace intelligence::jsonschema::cli {
 
-auto for_each_json(const std::vector<std::string> &arguments)
+auto for_each_json(const std::vector<std::string> &arguments,
+                   const std::set<std::string> &extensions)
     -> std::vector<
         std::pair<std::filesystem::path, sourcemeta::jsontoolkit::JSON>> {
   std::vector<std::pair<std::filesystem::path, sourcemeta::jsontoolkit::JSON>>
       result;
 
   if (arguments.empty()) {
-    handle_json_entry(std::filesystem::current_path(), result);
+    handle_json_entry(std::filesystem::current_path(), extensions, result);
   } else {
     for (const auto &entry : arguments) {
-      handle_json_entry(entry, result);
+      handle_json_entry(entry, extensions, result);
     }
   }
 
@@ -206,4 +228,29 @@ auto log_verbose(const std::map<std::string, std::vector<std::string>> &options)
   return null_stream;
 }
 
+auto parse_extensions(const std::map<std::string, std::vector<std::string>>
+                          &options) -> std::set<std::string> {
+  std::set<std::string> result;
+
+  if (options.contains("extension")) {
+    for (const auto &extension : options.at("extension")) {
+      log_verbose(options) << "Using extension: " << extension << "\n";
+      result.insert(normalize_extension(extension));
+    }
+  }
+
+  if (options.contains("e")) {
+    for (const auto &extension : options.at("e")) {
+      log_verbose(options) << "Using extension: " << extension << "\n";
+      result.insert(normalize_extension(extension));
+    }
+  }
+
+  if (result.empty()) {
+    result.insert({".json"});
+  }
+
+  return result;
+}
+
 } // namespace intelligence::jsonschema::cli

src/utils.h

@@ -26,7 +26,8 @@ auto parse_options(const std::span<const std::string> &arguments,
                    const std::set<std::string> &flags)
     -> std::map<std::string, std::vector<std::string>>;
 
-auto for_each_json(const std::vector<std::string> &arguments)
+auto for_each_json(const std::vector<std::string> &arguments,
+                   const std::set<std::string> &extensions)
     -> std::vector<
         std::pair<std::filesystem::path, sourcemeta::jsontoolkit::JSON>>;
 
@@ -45,6 +46,9 @@ auto resolver(const std::map<std::string, std::vector<std::string>> &options,
 auto log_verbose(const std::map<std::string, std::vector<std::string>> &options)
     -> std::ostream &;
 
+auto parse_extensions(const std::map<std::string, std::vector<std::string>>
+                          &options) -> std::set<std::string>;
+
 } // namespace intelligence::jsonschema::cli
 
 #endif

test/CMakeLists.txt

@@ -19,6 +19,7 @@ add_jsonschema_test_unix(format_single)
 add_jsonschema_test_unix(format_invalid_path)
 add_jsonschema_test_unix(format_directory)
 add_jsonschema_test_unix(format_cwd)
+add_jsonschema_test_unix(format_multi_extension)
 add_jsonschema_test_unix(format_check_single_fail)
 add_jsonschema_test_unix(format_check_single_pass)
 add_jsonschema_test_unix(frame)

test/format_multi_extension.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+TMP="$(mktemp -d)"
+clean() { rm -rf "$TMP"; }
+trap clean EXIT
+
+cat << 'EOF' > "$TMP/schema_1.json"
+{
+  "additionalProperties": false,
+  "title": "Hello World",
+  "properties": {"foo": {}, "bar": {}}
+}
+EOF
+
+cat << 'EOF' > "$TMP/schema_2.schema.json"
+{"type": "string", "title": "My String"}
+EOF
+
+cd "$TMP"
+"$1" fmt --extension .schema.json -v
+
+cat << 'EOF' > "$TMP/expected_1.json"
+{
+  "additionalProperties": false,
+  "title": "Hello World",
+  "properties": {"foo": {}, "bar": {}}
+}
+EOF
+
+cat << 'EOF' > "$TMP/expected_2.json"
+{
+  "title": "My String",
+  "type": "string"
+}
+EOF
+
+diff "$TMP/schema_1.json" "$TMP/expected_1.json"
+diff "$TMP/schema_2.schema.json" "$TMP/expected_2.json"