2 files changed, 132 insertions, 0 deletions
diff --git a/src/Cli/Cli.c b/src/Cli/Cli.c
new file mode 100644
index 0000000..3648493
--- /dev/null
+++ b/src/Cli/Cli.c
@@ -0,0 +1,102 @@
+#include "Cli/Cli.h"
+
+#include "Logger/Logger.h"
+#include "Version/Version.h"
+
+#include <getopt.h>
+#include <stdio.h>
+
+void cli_print_usage(const char *program_name) {
+  fprintf(
+      stderr,
+      "Usage:\n"
+      "  %s FILE [-o OUTPUT]\n"
+      "  %s -d DIRECTORY [-o OUTPUT] [-f]\n\n"
+      "Options:\n"
+      "  -d, --directory DIRECTORY   Process a directory recursively\n"
+      "  -o, --output OUTPUT         Set the output path\n"
+      "  -f, --overwrite             Overwrite an existing output directory\n"
+      "  -l, --log-level LEVEL       error, warning, info, debug, or silent\n"
+      "  -v, --version               Show the program version\n"
+      "  -h, --help                  Show this help\n",
+      program_name, program_name);
+}
+
+static void cli_print_version(void) { printf("yapssg %s\n", yapssg_version); }
+
+static const char *strip_optional_equals(const char *value) {
+  return value != NULL && value[0] == '=' ? value + 1 : value;
+}
+
+CliParseResult cli_parse(int argc, char **argv, CliOptions *options) {
+  static const struct option long_options[] = {
+      {"directory", required_argument, NULL, 'd'},
+      {"output", required_argument, NULL, 'o'},
+      {"overwrite", no_argument, NULL, 'f'},
+      {"force", no_argument, NULL, 'f'},
+      {"log-level", required_argument, NULL, 'l'},
+      {"version", no_argument, NULL, 'v'},
+      {"help", no_argument, NULL, 'h'},
+      {NULL, 0, NULL, 0}};
+  const char *directory = NULL;
+  int option;
+
+  options->input_type = INPUT_TYPE_NONE;
+  options->input_path = NULL;
+  options->output_path = NULL;
+  options->overwrite_output = 0;
+  options->log_level = LOG_LEVEL_INFO;
+
+  while ((option = getopt_long(argc, argv, "d:o:fl:vh", long_options, NULL)) !=
+         -1) {
+    switch (option) {
+    case 'd':
+      directory = strip_optional_equals(optarg);
+      break;
+    case 'o':
+      options->output_path = strip_optional_equals(optarg);
+      break;
+    case 'f':
+      options->overwrite_output = 1;
+      break;
+    case 'l':
+      if (logger_parse_level(optarg, &options->log_level) != 0) {
+        logger_error("unknown log level '%s'", optarg);
+        return CLI_PARSE_ERROR;
+      }
+      break;
+    case 'v':
+      cli_print_version();
+      return CLI_PARSE_VERSION;
+    case 'h':
+      cli_print_usage(argv[0]);
+      return CLI_PARSE_HELP;
+    default:
+      cli_print_usage(argv[0]);
+      return CLI_PARSE_ERROR;
+    }
+  }
+
+  if (directory != NULL) {
+    if (optind != argc || directory[0] == '\0') {
+      logger_error("a directory cannot be combined with a file");
+      return CLI_PARSE_ERROR;
+    }
+    options->input_type = INPUT_TYPE_DIRECTORY;
+    options->input_path = directory;
+  } else {
+    if (optind + 1 != argc) {
+      cli_print_usage(argv[0]);
+      return CLI_PARSE_ERROR;
+    }
+    options->input_type = INPUT_TYPE_FILE;
+    options->input_path = argv[optind];
+  }
+
+  if (options->output_path != NULL && options->output_path[0] == '\0') {
+    logger_error("output path cannot be empty");
+    return CLI_PARSE_ERROR;
+  }
+
+  return CLI_PARSE_OK;
+}
diff --git a/src/Cli/Cli.h b/src/Cli/Cli.h
new file mode 100644
index 0000000..9695fd4
--- /dev/null
+++ b/src/Cli/Cli.h
@@ -0,0 +1,30 @@
+#ifndef YAPSSG_CLI_H
+#define YAPSSG_CLI_H
+
+#include "Logger/Logger.h"
+
+typedef enum {
+  INPUT_TYPE_NONE,
+  INPUT_TYPE_FILE,
+  INPUT_TYPE_DIRECTORY
+} InputType;
+
+typedef enum {
+  CLI_PARSE_ERROR = -1,
+  CLI_PARSE_OK,
+  CLI_PARSE_HELP,
+  CLI_PARSE_VERSION
+} CliParseResult;
+
+typedef struct {
+  InputType input_type;
+  const char *input_path;
+  const char *output_path;
+  int overwrite_output;
+  LogLevel log_level;
+} CliOptions;
+
+CliParseResult cli_parse(int argc, char **argv, CliOptions *options);
+void cli_print_usage(const char *program_name);
+
+#endif