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How can tab completion be implemented in a loop that accepts user input using bash and readline?

asked 2022-03-24 11:00:00 +0000

nofretete gravatar image

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answered 2022-07-29 01:00:00 +0000

devzero gravatar image

Tab completion can be implemented in a loop that accepts user input using bash and readline by defining a custom completion function and binding it to the Tab key.

Here is an example code snippet:

#!/bin/bash

# Define a completion function that generates a list of possible completions
_complete() {
    local cur="${COMP_WORDS[COMP_CWORD]}"
    local list=$(ls -1 /path/to/directory | grep "^$cur")
    COMPREPLY=( $(compgen -W "${list}" -- ${cur}) )
}

# Bind the completion function to the Tab key
bind -x '"\t":_complete'

# Start a while loop that accepts user input
while read -r input; do
    echo "You entered: ${input}"
done

This code defines a completion function _complete that generates a list of possible completions by listing the contents of a directory and filtering them based on the current input. The function sets the COMPREPLY variable to a list of completions, which is then passed to the compgen command to generate the actual completions.

The code then binds the Tab key to the _complete function using the bind command. This means that whenever the user presses Tab while entering input, the completion function is called to generate a list of possible completions.

Finally, the code starts a while loop that accepts user input using the read command. Within the loop, the user input is printed to the console. Whenever the user presses Tab while entering input, the completion function is called to generate a list of completions, which are then displayed to the user as options. The user can then select a completion by pressing Tab again or by selecting one of the displayed options using the arrow keys.

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Asked: 2022-03-24 11:00:00 +0000

Seen: 2 times

Last updated: Jul 29 '22