Add documentation for `config`, `dyn_array`, `error`, and `string_buf`.

.gitignore

@@ -1,5 +1,6 @@
 .cache/
 .direnv/
-compile_commands.json
 bootstrap
+compile_commands.json
+docs/
 test/runner

README.md

@@ -2,6 +2,8 @@
 
 TODO:
 - [ ] Add documentation throughout (ownership, docstrings, etc.).
+- [ ] Add evaluator tests.
+- [ ] Color output to console.
 
 CLI utility for initializing projects in reproducible ways.
 

flake.nix

@@ -26,6 +26,7 @@
             bear
             clang-tools
             codelldb
+            doxygen
           ];
           buildInputs = with pkgs; [
             ncurses

include/config.h

@@ -1,27 +1,59 @@
+/**
+@file
+@brief A `spec` configuration.
+*/
 #ifndef _BOOTSTRAP_CONFIG_H
 #define _BOOTSTRAP_CONFIG_H
 
 #include "error.h"
 
+/**
+@brief A collection of parameters that identify a `spec`.
+
+Each member of the @ref Config is expected to outlive the @ref Config instance
+itself.
+*/
 struct Config {
-  // The directory the `bootstrap` command was run from.
-  // OWNERSHIP: Does not own this pointer.
+  /// The directory the `bootstrap` command was run from. Does not take
+  /// ownership of this pointer.
   const char *cwd;
-  // The root directory housing our specs.
-  // OWNERSHIP: Does not own this pointer.
+  /// The root directory housing our specs. Does not take ownership of this
+  /// pointer.
   const char *root_dir;
-  // The name of the spec we want to bootstrap.
-  // OWNERSHIP: Does not own this pointer.
+  /// The name of the spec we want to bootstrap. Does not take ownership of
+  /// this pointer.
   const char *target;
 };
 
-struct Error *config_load(
+/**
+@brief Create a new @ref Config instance.
+
+@param cwd
+ The current working directory the `bootstrap` command was invoked from.
+@param root_dir
+ An absolute path to the collection of specs `bootstrap` will search through.
+@param target
+ The `spec` that should be bootstrapped.
+@return
+ A new @ref Config instance. The caller takes ownership of this value.
+
+@see config_free
+*/
+struct Error *config_new(
   const char *cwd,
   const char *root_dir,
   const char *target,
   struct Config **config
 );
 
+/**
+@brief Deallocates a previously allocated @ref Config instance.
+
+@param config
+ A pointer to a @ref Config instance. If null, this function is a no-op.
+
+@see config_new
+*/
 void config_free(struct Config *config);
 
 #endif /* BOOTSTRAP_CONFIG_H */

include/dyn_array.h

@@ -1,22 +1,72 @@
+/**
+@file
+@brief Dynamic `void*` arrays.
+*/
 #ifndef _BOOTSTRAP_DYN_ARRAY_H
 #define _BOOTSTRAP_DYN_ARRAY_H
 
 #include <stdlib.h>
 
+/**
+@brief A dynamic array of generic pointers.
+
+A `void*` wrapper that grows larger as needed. If more space is needed during an
+append operation, the capacity of the internal array is doubled.
+*/
 struct DynArray {
+  /// The underlying `void*` pointer.
   void **buf;
-  // The size of @buf excluding `NUL`.
+  /// The size of @ref DynArray.buf.
   size_t size;
-  // The allocated size of @buf including `NUL`.
+  // The allocated size of @ref DynArray.buf.
   size_t _capacity;
 };
 
+/**
+@brief Create a new @ref DynArray instance.
+
+@param capacity
+ The initial size of the internal array. To avoid too many reallocations, aim to
+ make this value large enough to accommodate the eventual size of the buffer.
+
+@see dyn_array_free
+*/
 struct DynArray *dyn_array_new(size_t capacity);
 
+/**
+@brief Returns the number of items contained in the internal buffer.
+
+@param a
+ A valid pointer to a @ref DynArray instance.
+@return
+  The number of items contained in the internal buffer.
+*/
 size_t dyn_array_size(struct DynArray *a);
 
+/**
+@brief Appends a new item onto the end of the internal @ref DynArray.buf.
+
+This function takes ownership of @p item and will attempt to `free` the
+parameter when the @ref DynArray is `free`'d. For this reason, only provide
+entries that have been allocated on the heap.
+
+@param a
+ A valid pointer to a @ref DynArray instance.
+@param item
+ A valid pointer to a heap-allocated object.
+
+@see dyn_array_free
+*/
 void dyn_array_push(struct DynArray *a, void *item);
 
+/**
+@brief Deallocates a previously allocated @ref DynArray instance.
+
+@param a
+ A pointer to a @ref DynArray instance. If null, this function is a no-op.
+
+@see dyn_array_new
+*/
 void dyn_array_free(struct DynArray *a);
 
 #endif /* _BOOTSTRAP_DYN_ARRAY_H */

include/error.h

@@ -1,3 +1,7 @@
+/**
+@file
+@brief Error handling.
+*/
 #ifndef _BOOTSTRAP_ERROR_H
 #define _BOOTSTRAP_ERROR_H
 
@@ -5,27 +9,55 @@
 
 #include "string_buf.h"
 
+/**
+@brief The various error codes produced by `bootstrap`.
+*/
 enum ErrorCode {
+  /// Could not retrieve the value of `$CWD`.
   ERROR_CONFIG_ENV_CWD_INVALID = 1,
+  /// No root directory was specified. This must either be set via the command
+  /// line flag `-d` or environment variable `$BOOTSTRAP_ROOT_DIR`. If both are
+  /// provided, the command line flag takes priority.
   ERROR_CONFIG_ENV_ROOT_DIR_INVALID,
+  /// There is no file at the location corresponding to the specified spec.
   ERROR_CONFIG_TARGET_NOT_FOUND,
+  /// For generic reasons, `bootstrap` could not access the file at the provided
+  /// spec.
   ERROR_CONFIG_TARGET_INVALID,
+  /// The file at the location corresponding to the provided spec is not a
+  /// directory.
   ERROR_CONFIG_TARGET_NOT_DIR,
 
+  /// For generic reasons, `bootstrap` could not access the `spec.json` file.
   ERROR_PARSER_SPEC_JSON_INVALID,
+  /// The `spec.json` file is not valid JSON.
   ERROR_PARSER_SPEC_JSON_INVALID_SYNTAX,
 
+  /// The top-level JSON object of the `spec.json` file is not an object.
   ERROR_VALIDATOR_TOP_LEVEL_NOT_OBJECT,
+  /// A field in `spec.json` is not an object.
   ERROR_VALIDATOR_FIELD_NOT_OBJECT,
+  /// The `type` of a `spec.json` field is not a string.
   ERROR_VALIDATOR_FIELD_TYPE_INVALID,
+  /// The `type` of a `spec.json` field does not correspond to a known prompt
+  /// type.
   ERROR_VALIDATOR_FIELD_TYPE_UNKNOWN,
+  /// The `prompt` of a `spec.json` field is not a string.
   ERROR_VALIDATOR_FIELD_PROMPT_INVALID,
 
+  /// The `run.sh` file could not be found.
   ERROR_EVALUATOR_RUN_SH_NOT_FOUND,
+  /// The `run.sh` file is not executable.
   ERROR_EVALUATOR_RUN_SH_NOT_EXEC,
+  /// A user response to a prompt is not valid.
   ERROR_EVALUATOR_RESPONSE_INVALID,
 };
 
+/**
+@brief A `bootstrap` error.
+
+@see ERROR_NEW
+*/
 struct Error {
   enum ErrorCode code;
   const char *message;
@@ -47,10 +79,13 @@ static inline struct Error *priv_error_new(
 // clang-format off
 
 /**
-Return the number of elements of `__VA_ARGS__`.
+@brief Return the number of elements of `__VA_ARGS__`.
 
 Take the `__VA_ARGS__` list and append a list of decreasing numbers
-31, 30, ..., 0. Then, by using ALEN0, return the 31st element of that list.
+31, 30, ..., 0.
+
+@return
+ The number of elements of `__VA_ARGS__`.
 */
 #define ALEN(...) \
   ALEN0(          \
@@ -68,7 +103,17 @@ Take the `__VA_ARGS__` list and append a list of decreasing numbers
   ...) _1F
 
 /**
-Create a new `struct Error` instance.
+@brief Creates a new @ref Error instance.
+
+It is the responsibility of the caller to free the @ref Error instance.
+
+@param __VA_ARGS__
+ Allows supplying up to 31 `const char*` instances. These arguments will be
+ concatenated together and supplied to the new @ref Error instance.
+@return
+ A new @ref Error instance. The caller takes ownership of this value.
+
+@see error_free
 */
 #define ERROR_NEW(code, ...) \
   ERROR_NEW0(code, ALEN(__VA_ARGS__), __VA_ARGS__)
@@ -80,6 +125,14 @@ Create a new `struct Error` instance.
 
 // clang-format on
 
+/**
+@brief Deallocates a previously allocated @ref Error isntance.
+
+@param error
+ A pointer to a @ref Error instance. If null, this function is a no-op.
+
+@see ERROR_NEW
+*/
 void error_free(struct Error *error);
 
 #endif /* _BOOTSTRAP_ERROR_H */

include/string_buf.h

@@ -1,102 +1,100 @@
+/**
+@file
+@brief Dynamic character arrays.
+*/
 #ifndef _BOOTSTRAP_STRING_BUF_H
 #define _BOOTSTRAP_STRING_BUF_H
 
 #include <stdlib.h>
 
 /**
- * @brief A dynamic character array.
- *
- * A `char*` wrapper. Appending `char`s or NUL-terminated strings allocates
- * additional space as needed.
- */
+@brief A dynamic character array.
+
+A `char*` wrapper that grows larger as needed. Supports appending individual
+`char`s or NUL-terminated strings. If more space is needed during an append
+operation, the capacity is doubled repeatedly until the requested data fits.
+*/
 struct StringBuf {
+  /// The underlying `char*` pointer.
   char *buf;
-  // The length of @buf excluding `NUL`.
+  /// The size of @ref StringBuf.buf (excluding the `NUL` character).
   size_t size;
-  // The allocated size of @buf including `NUL`.
+  /// The allocated size of @ref StringBuf.buf (including the `NUL` character).
   size_t _capacity;
 };
 
 /**
- * Create a new `StringBuf` instance.
- *
- * @param capacity
- *  The initial size of the internal array (including the trailing `NUL`
- *  character). To avoid too many reallocations, aim to make this value large
- *  enough to accommodate the size the string is expected to eventually take.
- * @return
- *  A new `StringBuf` instance. The caller takes ownership of this value.
- *
- * @see string_buf_free
- */
+@brief Create a new @ref StringBuf instance.
+
+@param capacity
+ The initial size of the internal array (including the trailing `NUL`
+ character). To avoid too many reallocations, aim to make this value large
+ enough to accommodate the eventual size of the desired string.
+@return
+ A new @ref StringBuf instance. The caller takes ownership of this value.
+
+@see string_buf_free
+*/
 struct StringBuf *string_buf_new(size_t capacity);
 
 /**
- * Return the number of characters contained in the internal buffer.
- *
- * @param sb
- *  A valid pointer to a `StringBuf` instance.
- * @return
- *  The number of characters contained in the internal buffer.
- */
+@brief Returns the number of characters contained in the internal buffer
+(excluding the NUL character).
+
+@param sb
+ A valid pointer to a @ref StringBuf instance.
+@return
+ The number of characters contained in the internal buffer.
+*/
 size_t string_buf_size(struct StringBuf *sb);
 
 /**
- * Return the internal `NUL`-terminated string buffer.
- *
- * @param sb
- *  A valid pointer to a `StringBuf` instance.
- * @return
- *  The internally managed string.
- */
-const char *string_buf_value(struct StringBuf *sb);
+@brief Appends a character to the end of the provided @ref StringBuf.
 
-/**
- * Append a character to the end of a `StringBuf`.
- *
- * If appending would cause the internal buffer to overflow, reallocates the
- * internal array to accommodate.
- *
- * @param sb
- *  A valid pointer to a `StringBuf` instance.
- * @param c
- *  The `char` to append to the end of `sb`.
- */
+If appending would cause the internal buffer to overflow, doubles the capacity
+of the internal array to accommodate.
+
+@param sb
+ A valid pointer to a @ref StringBuf instance.
+@param c
+ The `char` to append to the end of @p sb.
+*/
 void string_buf_cappend(struct StringBuf *sb, char c);
 
 /**
- * Append a `NUL`-terminated string to the end of a `StringBuf`.
- *
- * If appending would cause the internal buffer to overflow, `realloc`s are
- * performed internally to accommodate.
- *
- * @param sb
- *  A valid pointer to a `StringBuf` instance.
- * @param s
- *  The `char*` to append to the end of `sb`.
- */
+@brief Appends a NUL-terminated string to the end of a @ref StringBuf.
+
+If appending would cause the internal buffer to overflow, doubles the capacity
+of the internal array the necessary number of times to accommodate.
+
+@param sb
+ A valid pointer to a @ref StringBuf instance.
+@param s
+ The `char*` to append to the end of @p sb.
+*/
 void string_buf_sappend(struct StringBuf *sb, const char s[static 1]);
 
 /**
- * Convert a `StringBuf` instance into a `char*`.
- *
- * @param sb
- *  A valid pointer to a `StringBuf` instance.
- * @return
- *  A null pointer if `sb` is null. Otherwise a `NUL`-terminated string
- *  corresponding to the value of `sb`. The caller takes ownership of this
- *  value.
- */
+@brief Converts a @ref StringBuf instance into a `char*`.
+
+This function frees the memory associated with @p sb.
+
+@param sb
+ A valid pointer to a @ref StringBuf instance.
+@return
+ A null pointer if @p sb is null. Otherwise a NUL-terminated string
+ corresponding to the value of @p sb. The caller takes ownership of this value.
+*/
 const char *string_buf_convert(struct StringBuf *sb);
 
 /**
- * Deallocate a previously allocated `StringBuf` instance.
- *
- * @param sb
- *  A valid pointer to a `StringBuf` instance.
- *
- * @see string_buf_new
- */
+@brief Deallocates a previously allocated @ref StringBuf instance.
+
+@param sb
+ A pointer to a @ref StringBuf instance. If null, this function is a no-op.
+
+@see string_buf_new
+*/
 void string_buf_free(struct StringBuf *sb);
 
 #endif /* _BOOTSTRAP_STRING_BUF_H */

main.c

@@ -21,7 +21,7 @@ static int run(const char *root_dir, const char *target) {
   struct Error *error = 0;
   struct Config *config = 0;
 
-  if ((error = config_load(cwd, root_dir, target, &config))) {
+  if ((error = config_new(cwd, root_dir, target, &config))) {
     fprintf(stderr, "%s", error->message);
     goto cleanup_cwd;
   }

src/config.c

@@ -8,7 +8,7 @@
 
 #include "path.h"
 
-struct Error *config_load(
+struct Error *config_new(
   const char *cwd,
   const char *root_dir,
   const char *target,

src/dyn_array.c

@@ -18,6 +18,7 @@ size_t dyn_array_size(struct DynArray *a) {
 
 void dyn_array_push(struct DynArray *a, void *item) {
   assert(a);
+  assert(item);
   if (a->size == a->_capacity) {
     a->_capacity *= 2;
     a->buf = realloc(a->buf, sizeof(void *) * a->_capacity);

test/runner.c

@@ -10,10 +10,10 @@ int main(int argc, char *argv[]) {
   sput_start_testing();
 
   sput_enter_suite("config");
-  sput_run_test(test_config_load_invalid_args);
-  sput_run_test(test_config_load_spec_not_found);
-  sput_run_test(test_config_load_spec_not_dir);
-  sput_run_test(test_config_load_success);
+  sput_run_test(test_config_new_invalid_args);
+  sput_run_test(test_config_new_spec_not_found);
+  sput_run_test(test_config_new_spec_not_dir);
+  sput_run_test(test_config_new_success);
 
   sput_enter_suite("dyn_array");
   sput_run_test(test_dyn_array_zero_capacity);

test/test_config.h

@@ -33,16 +33,16 @@ static void test_config_teardown(struct TestConfigFixture *fixture) {
   free(fixture);
 }
 
-static void test_config_load_invalid_args() {
+static void test_config_new_invalid_args() {
   struct TestConfigFixture *fixture = test_config_setup();
 
   struct Error *error = 0;
   struct Config *config = 0;
 
-  error = config_load(0, fixture->root_dir, fixture->target, &config);
+  error = config_new(0, fixture->root_dir, fixture->target, &config);
   sput_fail_unless(error->code == ERROR_CONFIG_ENV_CWD_INVALID, "cwd == 0");
   error_free(error);
-  error = config_load(fixture->cwd, 0, fixture->target, &config);
+  error = config_new(fixture->cwd, 0, fixture->target, &config);
   sput_fail_unless(
     error->code == ERROR_CONFIG_ENV_ROOT_DIR_INVALID, "root_dir == 0"
   );
@@ -51,13 +51,13 @@ static void test_config_load_invalid_args() {
   test_config_teardown(fixture);
 }
 
-static void test_config_load_spec_not_found() {
+static void test_config_new_spec_not_found() {
   struct TestConfigFixture *fixture = test_config_setup();
 
   struct Error *error = 0;
   struct Config *config = 0;
 
-  error = config_load(fixture->cwd, fixture->root_dir, "not_found", &config);
+  error = config_new(fixture->cwd, fixture->root_dir, "not_found", &config);
   sput_fail_unless(
     error->code == ERROR_CONFIG_TARGET_NOT_FOUND, "target not found"
   );
@@ -66,13 +66,13 @@ static void test_config_load_spec_not_found() {
   test_config_teardown(fixture);
 }
 
-static void test_config_load_spec_not_dir() {
+static void test_config_new_spec_not_dir() {
   struct TestConfigFixture *fixture = test_config_setup();
 
   struct Error *error = 0;
   struct Config *config = 0;
 
-  error = config_load(fixture->cwd, fixture->root_dir, "not_dir", &config);
+  error = config_new(fixture->cwd, fixture->root_dir, "not_dir", &config);
   sput_fail_unless(
     error->code == ERROR_CONFIG_TARGET_NOT_DIR, "target not dir"
   );
@@ -81,21 +81,20 @@ static void test_config_load_spec_not_dir() {
   test_config_teardown(fixture);
 }
 
-static void test_config_load_success() {
+static void test_config_new_success() {
   struct TestConfigFixture *fixture = test_config_setup();
 
   struct Error *error = 0;
   struct Config *config = 0;
 
-  error =
-    config_load(fixture->cwd, fixture->root_dir, fixture->target, &config);
-  sput_fail_unless(error == 0, "config_load() success");
-  sput_fail_unless(strcmp(config->cwd, fixture->cwd) == 0, "config_load() cwd");
+  error = config_new(fixture->cwd, fixture->root_dir, fixture->target, &config);
+  sput_fail_unless(error == 0, "config_new() success");
+  sput_fail_unless(strcmp(config->cwd, fixture->cwd) == 0, "config_new() cwd");
   sput_fail_unless(
-    strcmp(config->root_dir, fixture->root_dir) == 0, "config_load() root_dir"
+    strcmp(config->root_dir, fixture->root_dir) == 0, "config_new() root_dir"
   );
   sput_fail_unless(
-    strcmp(config->target, fixture->target) == 0, "config_load() target"
+    strcmp(config->target, fixture->target) == 0, "config_new() target"
   );
 
   config_free(config);