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This patch adds a fairly rudimentary form of autocomplete. For starters,
it only works for filepaths, not for programs. Additionally, it
currently only works for the present working directory. You cannot yet
autocomplete even one more level deep.
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The getchar() function was changed so that it is able to detect some
ANSI escape sequences. To better handle this, getchar() now returns a
value from the Key enum, indicating whether or not an escape sequence
was found. Currently, the only escape sequences the function deals with
are arrow keys.
Handling of the left and right arrow keys were added to the getline()
function, in order to allow a user to go back and edit their command
inplace. Up and down arrow keys are also handled, but they are just
ignored for now (i.e. they do not move the cursor around anymore). The
local 'pos' variable became an Arc<Mutex<usize>>, since it needs to be
reset to 0 if ctrl-c is pressed (the handler for which is outside the
scope of getline()).
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Keep track of the cursor position in getline(), this way it is not
possible to backspace the prompt.
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Added the termios crate to facilitate the changing of certain terminal
options. It is a wrapper around the termios C library, so 'man 3
termios' for more details.
Added the custom getchar() function, with retrieves characters from
STDIN as they are typed by the user (as opposed to waiting for a
newline, like io::stdin().read_line()). This is necessary, since keys
like <tab> and <up> have special functionality, which needs to be acted
on before command submission.
Added the custom getline() function, which uses getchar() to read
characters as they are typed. The getline() function contains the logic
for the various key presses. For most characters, we simply push the
byte to a buffer, and print it out to the screen (since getline()
assumes ECHO is off).
Notes:
For now, <tab> autocomplete is not finished, so hitting the tab key only
replaces the tabs with spaces in the inbut buffer. Also, some edge cases
are unhandled in getline(). For instance, using the arrow keys appears
to move the cursor keys. The parser gets upset when you move the cursor
then try to submit a command, so this needs to be fixed.
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