Get the CWD on launch.

include/config.h

@@ -2,22 +2,28 @@
 #define _SPEC_CONFIG_H
 
 struct Config {
-  // The root directory housing our specs. This string is nonempty.
+  // The directory the `spec` command was run from.
+  // OWNERSHIP: Does not own this pointer.
+  const char *cwd;
+  // The root directory housing our specs.
+  // OWNERSHIP: Does not own this pointer.
   const char *root_dir;
-  // The name of the spec we want to load. This string is nonempty.
+  // The name of the spec we want to load.
+  // OWNERSHIP: Does not own this pointer.
   const char *target;
 };
 
 enum ConfigError {
+  // Indicates the $CWD could not be retrieved.
+  CE_ENV_CWD_INVALID = 1,
   // Indicates the `$SPEC_ROOT_DIR` environment variable is empty.
-  ENV_SPEC_ROOT_DIR_MISSING = 1,
-  // Indicates the `$SPEC_ROOT_DIR` environment variable is not set.
-  ENV_SPEC_ROOT_DIR_EMPTY,
+  CE_ENV_SPEC_ROOT_DIR_INVALID,
   // Indicates the target argument is invalid.
-  INVALID_TARGET,
+  CE_TARGET_INVALID,
 };
 
 enum ConfigError config_load(
+  const char *cwd,
   const char *root_dir,
   const char *target,
   struct Config **config

main.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #include "config.h"
 #include "dyn_array.h"
@@ -14,21 +15,24 @@ int main(int argc, char **argv) {
     exit(EXIT_FAILURE);
   }
 
+  const char *cwd = getcwd(0, 0);
   const char *root_dir = getenv(ENV_SPEC_ROOT_DIR);
+  const char *target = argv[1];
 
   struct Config *config = 0;
-  switch (config_load(root_dir, argv[1], &config)) {
-  case ENV_SPEC_ROOT_DIR_MISSING:
+  switch (config_load(cwd, root_dir, target, &config)) {
+  case CE_ENV_CWD_INVALID:
+    fprintf(stderr, "Could not retrieve the $CWD value.");
+    exit(EXIT_FAILURE);
+  case CE_ENV_SPEC_ROOT_DIR_INVALID:
     fprintf(stderr, "Must specify $SPEC_ROOT_DIR environment variable.");
     exit(EXIT_FAILURE);
-  case ENV_SPEC_ROOT_DIR_EMPTY:
-    fprintf(stderr, "$SPEC_ROOT_DIR environment variable should not be empty.");
-    exit(EXIT_FAILURE);
-  case INVALID_TARGET:
+  case CE_TARGET_INVALID:
     fprintf(stderr, "Target spec `%s` is invalid.", argv[1]);
     exit(EXIT_FAILURE);
   }
 
   config_free(config);
+  free((void *)cwd);
   return EXIT_SUCCESS;
 }

src/config.c

@@ -4,31 +4,25 @@
 #include "config.h"
 
 enum ConfigError config_load(
+  const char *cwd,
   const char *root_dir,
   const char *target,
   struct Config **config
 ) {
-  if (root_dir == 0) {
-    return ENV_SPEC_ROOT_DIR_MISSING;
+  if (cwd == 0) {
+    return CE_ENV_CWD_INVALID;
   }
-  if (root_dir[0] == 0) {
-    return ENV_SPEC_ROOT_DIR_EMPTY;
+  if (root_dir == 0) {
+    return CE_ENV_SPEC_ROOT_DIR_INVALID;
   }
   if (target == 0) {
-    return INVALID_TARGET;
-  }
-
-  size_t target_len = strlen(target);
-  if (target_len == 0) {
-    return INVALID_TARGET;
+    return CE_TARGET_INVALID;
   }
 
   *config = malloc(sizeof(struct Config));
+  (*config)->cwd = cwd;
   (*config)->root_dir = root_dir;
-
-  char *copy_target = calloc(1, target_len + 1);
-  strcpy(copy_target, target);
-  (*config)->target = copy_target;
+  (*config)->target = target;
 
   return 0;
 }
@@ -37,6 +31,5 @@ void config_free(struct Config *config) {
   if (!config) {
     return;
   }
-  free((void *)config->target);
   free(config);
 }

test/test_config.h

@@ -4,39 +4,40 @@
 #include "config.h"
 #include "sput.h"
 
+static const char *SAMPLE_CWD = "/home/jrpotter/Documents/spec";
+static const char *SAMPLE_ROOT_DIR = "/usr/local/share/specs";
+static const char *SAMPLE_TARGET = "example-target";
+
+static void test_config_load_cwd_invalid() {
+  struct Config *config = 0;
+  enum ConfigError retval =
+      config_load(0, SAMPLE_ROOT_DIR, SAMPLE_TARGET, &config);
+  sput_fail_unless(retval == CE_ENV_CWD_INVALID, "target == 0");
+}
+
 static void test_config_load_root_dir_invalid() {
   struct Config *config = 0;
-
-  enum ConfigError retval = 0;
-
-  retval = config_load(0, "target", &config);
-  sput_fail_unless(retval == ENV_SPEC_ROOT_DIR_MISSING, "root_dir == 0");
-
-  retval = config_load("", "target", &config);
-  sput_fail_unless(retval == ENV_SPEC_ROOT_DIR_EMPTY, "root_dir == \"\"");
+  enum ConfigError retval = config_load(SAMPLE_CWD, 0, SAMPLE_TARGET, &config);
+  sput_fail_unless(retval == CE_ENV_SPEC_ROOT_DIR_INVALID, "root_dir == 0");
 }
 
 static void test_config_load_target_invalid() {
   struct Config *config = 0;
-  enum ConfigError retval = 0;
-
-  retval = config_load("/usr/local/share/specs", 0, &config);
-  sput_fail_unless(retval == INVALID_TARGET, "target == 0");
-
-  retval = config_load("/usr/local/share/specs", "", &config);
-  sput_fail_unless(retval == INVALID_TARGET, "target == \"\"");
+  enum ConfigError retval =
+      config_load(SAMPLE_CWD, SAMPLE_ROOT_DIR, 0, &config);
+  sput_fail_unless(retval == CE_TARGET_INVALID, "target == 0");
 }
 
 static void test_config_load_success() {
   struct Config *config = 0;
   enum ConfigError retval =
-      config_load("/usr/local/share/specs", "target", &config);
+      config_load(SAMPLE_CWD, SAMPLE_ROOT_DIR, SAMPLE_TARGET, &config);
 
   sput_fail_unless(retval == 0, "config_load() success");
-  sput_fail_unless(strcmp(config->root_dir, "/usr/local/share/specs") == 0,
+  sput_fail_unless(strcmp(config->root_dir, SAMPLE_ROOT_DIR) == 0,
                    "config_load() root_dir");
-  sput_fail_unless(strcmp(config->target, "target") == 0,
-                   "config_load(0 target");
+  sput_fail_unless(strcmp(config->target, SAMPLE_TARGET) == 0,
+                   "config_load() target");
 
   config_free(config);
 }