minishell

To-do list. Vita:

Arch:

• norm (for now skip init.c, ft_cd.c, file_manager1.c, free_utils1.c)

(old)To-do list:

1. Divide on logical groups/tokens (lexer thing);
2. Check for errors in logical groups (for example syntax error, ”/’/) missing);
3. Check tokens and word expansion (“...”, $VAR) (parser thing);
4. Run command (execution thing):
   4.1) If not a built-in command, we run the child process and execute command;
   4.2) If it is a built-in command, we don’t run the child process but execute it in the parent one.
5. ???
6. Profit.

Types of tokens:

1. separator (all that is true for is_space());
2. word/command (for example ls, cat e.t.c. “” counts as an empty string);
3. field (‘...’);
4. expandable field (“...”);
5. redirection:
   5.1) < should redirect input;
   5.2) > should redirect output;
   5.3) << should be given a delimiter, then read the input until a line containing the delimiter is seen. However, it doesn’t have to update the history;
   5.4) >> should redirect output in append mode.
6. pipe (|);
7. braces ((, ));
8. dollar sign (to handle env variables ($VAR) and $? for expanding the exit status of the most recently executed foreground pipeline);
9. if-and (&&) (bonus part);
10. if-or (||) (bonus part).

Things to handle:

1. Display a prompt when waiting for a new command;
2. Have a working history;
3. Search and launch the right executable (based on the PATH variable or using a relative or an absolute path);
4. Avoid using more than one global variable to indicate a received signal
5. ctrl-C displays a new prompt on a new line;
6. ctrl-D exits the shell;
7. ctrl-\ does nothing;
8. Wildcards * (bonus part);

Built-ins:

1. echo with option -n;
2. cd with only a relative or absolute path;
3. pwd with no options;
4. export with no options;
5. unset with no options;
6. env with no options or arguments;
7. exit with no options.