cmd #1: use dynamic memory for managing args

build.sh

@@ -3,7 +3,7 @@
 set -xe
 
 CC="gcc"
-FLAGS="-Wall -Wpedantic"
+FLAGS="-Wall -Wpedantic -ggdb"
 SRCS="$(find ./src -type f -name "*.c")"
 CURRENT_DIR="$(git rev-parse --show-toplevel)"
 BUILD_DIR="${CURRENT_DIR}/build"

src/cdo.c

@@ -2,8 +2,12 @@
 
 #include "cmd.h"
 
-int main (int argc, char *argv[]) {
+static void __attribute__((constructor)) init_cdo(void) {
+  atexit(exit_cmd);
   init_cmd();
+}
+
+int main (int argc, char *argv[]) {
   struct CommandLineArg* args = parse_args(argc, argv);
   return 0;
 }

src/cmd.c

@@ -5,43 +5,79 @@
 #include <stdlib.h>
 #include <string.h>
 
-const struct CommandLineArg supported_args [] = {
-    {
-        "PROJECT",
-        "Path to the project to be used for looking up TODO's",
-        "Current Working directory",
-        STRING
-    },
-    {}
+static struct ArgList* supported_args;
+
+static const char* PREDEFINED_ARG_NAMES [] = {
+    "project"
+};
+
+static const char* PREDEFINED_ARG_DESC [] = {
+    "Path to the project to be used for looking up TODO's"
+};
+
+static const char* PREDEFINED_ARG_VALUES [] = {
+    NULL
 };
 
 void usage(void) {
     Buffer * usage_lines = buffer_create(DEFAULT_USAGE_LINE_LEN);
     buffer_append(usage_lines, "Usage: cdo [PROJECT] [OPTION]\n");
     buffer_append(usage_lines, "Parse TODO's of the PROJECT.\n\n");
-    for (int i = 0; supported_args[i].type != EMPTY; i++) {
-        buffer_append(usage_lines, supported_args[i].name);
+    for (int i = 0; i < ARG_COUNT; i++) {
+        buffer_append(usage_lines, supported_args->args[i].name);
         buffer_append(usage_lines, " - ");
-        buffer_append(usage_lines, supported_args[i].description);
+        buffer_append(usage_lines, supported_args->args[i].description);
+        if (supported_args->args[i].value) {
             buffer_append(usage_lines, " [DEFAULT = ");
-        buffer_append(usage_lines, supported_args[i].value);
+            buffer_append(usage_lines, supported_args->args[i].value);
+            buffer_append(usage_lines, "]");
         }
-    buffer_append(usage_lines, "\n]");
+    }
+    buffer_append(usage_lines, "\n");
     buffer_flush(usage_lines);
 }
 
-void init_cmd(void) {
-    return
+static struct CommandLineArg* renderArg(ArgName name) {
+    struct CommandLineArg* e = malloc(sizeof(struct CommandLineArg));
+    e->name = NULL;
+    e->description = NULL;
+    e->value = NULL;
+    if (PREDEFINED_ARG_NAMES[name]) {
+        e->name = malloc(strlen(PREDEFINED_ARG_NAMES[name]) + 1);
+        strcpy(e->name, PREDEFINED_ARG_NAMES[name]);
+    }
+    if (PREDEFINED_ARG_DESC[name]) {
+        e->description = malloc(strlen(PREDEFINED_ARG_DESC[name]) + 1);
+        strcpy(e->description, PREDEFINED_ARG_DESC[name]);
+    }
+    if (PREDEFINED_ARG_VALUES[name]) {
+        e->value = malloc(strlen(PREDEFINED_ARG_VALUES[name]) + 1);
+        strcpy(e->value, PREDEFINED_ARG_VALUES[name]);
+    }
+    return e;
 }
 
-void create_arg_list(struct ArgList* list, size_t capacity) {
+void init_cmd(void) {
+    supported_args = create_arg_list(ARG_COUNT);
+    for (int i = 0; i < ARG_COUNT; i++) {
+        append_arg(supported_args, renderArg(i));
+    }
+}
+
+void exit_cmd(void) {
+    free_arg_list(supported_args);
+}
+
+struct ArgList* create_arg_list(size_t capacity) {
+    struct ArgList* list = NULL;
     list = (struct ArgList*) malloc(sizeof(struct ArgList));
     list->args = (struct CommandLineArg*) malloc(capacity * sizeof(struct CommandLineArg));
     list->size = 0;
     list->capacity = capacity;
+    return list;
 }
 
-void append_arg(struct ArgList* list, struct CommandLineArg arg) {
+void append_arg(struct ArgList* list, struct CommandLineArg* arg) {
     if (list->size + 1 >= list->capacity) {
         list->capacity *= 2;
         list->args =
@@ -51,11 +87,20 @@ void append_arg(struct ArgList* list, struct CommandLineArg arg) {
             list->capacity * sizeof(struct CommandLineArg)
         );
     }
-    memcpy(
-        list->args + (list->size * sizeof(struct CommandLineArg)),
-        &arg,
-        sizeof(struct CommandLineArg)
-    );
+    memcpy(list->args + list->size, arg, sizeof(struct CommandLineArg));
+    free(arg);
+    list->size += 1;
+}
+
+void free_arg_list(struct ArgList* list) {
+    for (size_t i = 0; i < ARG_COUNT; i++) {
+        free(list->args[i].name);
+        free(list->args[i].description);
+        free(list->args[i].value);
+    }
+    free(list->args);
+    free(list);
+    
 }
 
 struct CommandLineArg* parse_args(const int argc, char* argv[]) {

src/cmd.h

@@ -1,21 +1,22 @@
 #ifndef __CMD_H__
 #define __CMD_H__
 
+#include <stdlib.h>
+
 #define MAX_CMD_LINE_ARG_NAME_LEN 256
 #define MAX_CMD_LINE_ARG_DESC_LEN 1024
 #define DEFAULT_USAGE_LINE_LEN 256
 #define SUPPORTED_ARGS_AMOUNT 2
 
 typedef enum {
-    EMPTY,
-    STRING
-} CmdType;
+    ARG_PROJECT,
+    ARG_COUNT
+} ArgName;
 
 struct CommandLineArg {
-    char name[MAX_CMD_LINE_ARG_NAME_LEN];
-    char description[MAX_CMD_LINE_ARG_DESC_LEN];
+    char* name;
+    char* description;
     char* value;
-    CmdType type;
 };
 
 struct ArgList {
@@ -24,12 +25,12 @@ struct ArgList {
     size_t size;
 };
 
-struct ArgList* supported_arg_list;
-
 struct CommandLineArg* parse_args(const int argc, char* argv[]);
 void init_cmd(void);
-void create_arg_list(struct ArgList* list, size_t capacity);
-void append_arg(struct ArgList* list, struct CommandLineArg arg);
+void exit_cmd(void);
+struct ArgList* create_arg_list(size_t capacity);
+void append_arg(struct ArgList* list, struct CommandLineArg* arg);
+void free_arg_list(struct ArgList* list);
 void usage(void);
 
 #endif /*__CMD_H__*/

src/tools/buffer.h

@@ -1,8 +1,8 @@
-#include <stdlib.h>
-
 #ifndef __BUFFER_H__
 #define __BUFFER_H__
 
+#include <stdlib.h>
+
 typedef struct {
     char* data;
     size_t size;