Implement --fix for the lint command

src/command_lint.cc

@@ -2,15 +2,15 @@
 #include <sourcemeta/jsontoolkit/jsonschema.h>
 
 #include <cstdlib>  // EXIT_SUCCESS
+#include <fstream>  // std::ofstream
 #include <iostream> // std::cerr, std::cout, std::endl
 
 #include "command.h"
 #include "utils.h"
 
-// TODO: Implement a --fix flag
 auto intelligence::jsonschema::cli::lint(
     const std::span<const std::string> &arguments) -> int {
-  const auto options{parse_options(arguments, {})};
+  const auto options{parse_options(arguments, {"f", "fix"})};
 
   sourcemeta::jsontoolkit::SchemaTransformBundle bundle;
   bundle.add(
@@ -19,19 +19,33 @@ auto intelligence::jsonschema::cli::lint(
       sourcemeta::jsontoolkit::SchemaTransformBundle::Category::AntiPattern);
 
   bool result{true};
-  for (const auto &entry : for_each_json(options.at(""))) {
-    const bool subresult = bundle.check(
-        entry.second, sourcemeta::jsontoolkit::default_schema_walker,
-        resolver(options),
-        [&entry](const auto &pointer, const auto &name, const auto &message) {
-          std::cout << entry.first.string() << "\n";
-          std::cout << "    ";
-          sourcemeta::jsontoolkit::stringify(pointer, std::cout);
-          std::cout << " " << message << " (" << name << ")\n";
-        });
-
-    if (!subresult) {
-      result = false;
+
+  if (options.contains("f") || options.contains("fix")) {
+    for (const auto &entry : for_each_json(options.at(""))) {
+      log_verbose(options) << "Linting: " << entry.first.string() << "\n";
+      auto copy = entry.second;
+      bundle.apply(copy, sourcemeta::jsontoolkit::default_schema_walker,
+                   resolver(options));
+      std::ofstream output{entry.first};
+      sourcemeta::jsontoolkit::prettify(
+          copy, output, sourcemeta::jsontoolkit::schema_format_compare);
+      output << std::endl;
+    }
+  } else {
+    for (const auto &entry : for_each_json(options.at(""))) {
+      const bool subresult = bundle.check(
+          entry.second, sourcemeta::jsontoolkit::default_schema_walker,
+          resolver(options),
+          [&entry](const auto &pointer, const auto &name, const auto &message) {
+            std::cout << entry.first.string() << "\n";
+            std::cout << "    ";
+            sourcemeta::jsontoolkit::stringify(pointer, std::cout);
+            std::cout << " " << message << " (" << name << ")\n";
+          });
+
+      if (!subresult) {
+        result = false;
+      }
     }
   }
 

src/utils.cc

@@ -62,6 +62,10 @@ auto parse_options(const std::span<const std::string> &arguments,
                    const std::set<std::string> &flags)
     -> std::map<std::string, std::vector<std::string>> {
   std::map<std::string, std::vector<std::string>> options;
+  std::set<std::string> effective_flags{flags};
+  effective_flags.insert("v");
+  effective_flags.insert("verbose");
+
   options.insert({"", {}});
   std::optional<std::string> current_option;
   for (const auto &argument : arguments) {
@@ -72,7 +76,7 @@ auto parse_options(const std::span<const std::string> &arguments,
       assert(!current_option.value().empty());
       options.insert({current_option.value(), {}});
       assert(options.contains(current_option.value()));
-      if (flags.contains(current_option.value())) {
+      if (effective_flags.contains(current_option.value())) {
         current_option = std::nullopt;
       }
 
@@ -83,7 +87,7 @@ auto parse_options(const std::span<const std::string> &arguments,
       assert(current_option.value().size() == 1);
       options.insert({current_option.value(), {}});
       assert(options.contains(current_option.value()));
-      if (flags.contains(current_option.value())) {
+      if (effective_flags.contains(current_option.value())) {
         current_option = std::nullopt;
       }
 

test/CMakeLists.txt

@@ -22,3 +22,4 @@ add_jsonschema_test_unix(test_single_fail)
 add_jsonschema_test_unix(test_single_unsupported)
 add_jsonschema_test_unix(lint_pass)
 add_jsonschema_test_unix(lint_fail)
+add_jsonschema_test_unix(lint_fix)

test/lint_fix.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+set -o errexit
+set -o nounset
+
+TMP="$(mktemp -d)"
+# shellcheck disable=SC2317
+clean() { rm -rf "$TMP"; }
+trap clean EXIT
+
+cat << 'EOF' > "$TMP/schema.json"
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "string",
+  "enum": [ "foo" ]
+}
+EOF
+
+"$1" lint "$TMP/schema.json" --fix
+
+cat << 'EOF' > "$TMP/expected.json"
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "const": "foo"
+}
+EOF
+
+diff "$TMP/schema.json" "$TMP/expected.json"