{
  "extension": ".h",
  "source": "#include <readline/readline.h>\n#include <readline/history.h>\n\n#define HISTORY_FILE \"~/.calpaca_history\"\n\nbool line_initialized =false;\n\nchar *line_command_generator(const char *text, int state) {\n    static int list_index, len;\n    const char *commands[] = {\"help\", \"exit\", \"list\", \"review\",\"refactor\",\"opfuscate\", NULL};\n\n    if (!state) {\n        list_index = 0;\n        len = strlen(text);\n    }\n\n    while (commands[list_index]) {\n        const char *command = commands[list_index++];\n        if (strncmp(command, text, len) == 0) {\n            return strdup(command);  \n        }\n    }\n\n    return NULL;  \n}\n\nchar **line_command_completion(const char *text, int start, int end) {\n    rl_attempted_completion_over = 1;\n    return rl_completion_matches(text, line_command_generator);\n}\n\nvoid line_init(){\n    if(!line_initialized)\n    {    \n        rl_attempted_completion_function = line_command_completion;\n        line_initialized = true;\n         read_history(HISTORY_FILE);\n    }\n    \n}\n\nchar * line_read(char * prefix) {\n    char * data = readline(prefix);\n    if(!(data || *data)){\n        return NULL;\n    }\n    return data;\n}\nvoid line_add_history(char * data){\n    read_history(HISTORY_FILE);\n    add_history(data);\n    write_history(HISTORY_FILE);\n}",
  "review": "7\n\n## Bugs\n- The history file path is not expanded from `~` to the full home directory path.\n- `read_history` and `write_history` may encounter errors without handling them, e.g., file permissions or missing history file.\n- The check on `if(!(data || *data)){` in `line_read()` might lead to a potential null pointer dereference if `readline` returns null.\n\n## Optimizations\n- Use `getenv(\"HOME\")` or `wordexp` to properly expand the tilde (`~`) to the full path of the user's home directory.\n- Add error handling for `read_history` and `write_history` calls.\n- Use `if(data == NULL || *data == '\\0'){` in `line_read()` to handle potential null addresses safely.\n\n## Good points\n- Implements command completion which enhances user experience.\n- Utilizes the `readline` library effectively for command-line interaction.\n- Code is modular and functions are appropriately separated by concerns.\n\n## Summary\nThe code provides a basic command-line interface with features for command completion and history storage using the `readline` library. It does a commendable job on keeping possible commands and their completion minimalistic and straightforward. However, it encounters issues with the handling of user home directory paths in the context of a history file and lacks robust error handling concerning file operations for command history. Proper checks against null pointers need implementation to ensure more stable execution. \n\n## Open source alternatives\n- GNU Readline: The library is already being used but reviewing the full set of its capabilities can further optimize command-line interaction with line editing and custom completers.\n- `clap`: While mostly known for CLI parsing in Rust apps, its approach can inspire improvements in arguments handling.\n- `Linenoise`: A small, portable GNU Readline replacement for C.",
  "filename": "line.h",
  "path": "line.h",
  "directory": "",
  "grade": 7,
  "size": 1263,
  "line_count": 53
}