TODO:

• Handle ’ (single quote) which should prevent the shell from interpreting the meta- characters in the quoted sequence.
• Handle " (double quote) which should prevent the shell from interpreting the meta- characters in the quoted sequence except for $ (dollar sign).
• << 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!

BUGS:

Redirection & Appender

➜ >> a cat LICENSE.md
Command not found!
➜ cat >> a LICENSE.md
➜ cat > a LICENSE.md

ENV var

➜  minishell git:(main) ✗ unset truc
➜  minishell git:(main) ✗ 12=machin
➜  minishell git:(main) ✗ echo $&é
[1] 6602
$
[1]  + 6602 done       echo $
zsh: command not found: é
➜  minishell git:(main) ✗ echo $12
machin
➜  minishell git:(main) ✗ export 12
export: not an identifier: 12
➜  minishell git:(main) ✗ unset 12
➜  minishell git:(main) ✗ test=aaa
➜  minishell git:(main) ✗ echo %test%
%test%
➜  minishell git:(main) ✗ echo %HOME%
%HOME%
➜  minishell git:(main) ✗ export 12=machin
export: not an identifier: 12
➜  minishell git:(main) ✗ echo $12
machin
➜  minishell git:(main) ✗ unset 12
➜  minishell git:(main) ✗ 

IN PROGRESS:

DONE

• Implement pipes (| character). The output of each command in the pipeline is connected to the input of the next command via a pipe.
• Handle $? which should expand to the exit status of the most recently executed foreground pipeline.
• < should redirect input.
• Display a prompt when waiting for a new command.
• Have a working history.
• Search and launch the right executable (based on the PATH variable or using a relative or an absolute path).
• Not use more than one global variable. Think about it. You will have to explain its purpose. (I used it in controls/controls_handler.c)
• Handle ctrl-C, ctrl-D and ctrl-\ which should behave like in bash.
  • In interactive mode:
  • ctrl-C displays a new prompt on a new line.
  • ctrl-D exits the shell.
  • ctrl-\ does nothing.
• echo with option -n
• cd with only a relative or absolute path
• pwd with no options
• exit with no options
• Handle environment variables ($ followed by a sequence of characters) which should expand to their values.
• Not interpret unclosed quotes or special characters which are not required by the subject such as \ (backslash) or ; (semicolon).
• Parser don't support duplicated commands in a single line. (example: cat License.md && cat License.txt)
• export with no options
• unset with no options
• env with no options or arguments
• FIX cd command, it doesn't work properly, example:

➜ cd /var/www
➜ pwd
/var/www/
➜ cd .git
➜ pwd
.git/

• >> should redirect output in append mode.
• > should redirect output.