6.8 KiB
Bash Prompt Helpers
When creating bash based tools, it's often helpful to prompt the user for input or confirmation.
Loki comes pre-packaged with a handful of prompt helpers for your bash-based tools. These helpers can be used to prompt the user for various types of input, such as yes/no confirmations, text input, and selections from a list.
The utility script is located at functions/utils/prompt-utils.sh within your Loki functions directory.
The Loki functions directory varies between machines, so you can find its location on your system by running the following command in your terminal:
loki --info | grep functions_dir | awk '{print $2}'
Quick Links
Import The Prompt Utils Into Your Tools Script
In order to use the bash prompt helpers in your bash scripts, you need to source the provided prompt-utils.sh script.
This script is pre-packaged with Loki and is located here.
When sourcing the file in your bash script, you use the LLM_PROMPT_UTILS_FILE environment variable that automatically
populates the functions/utils/prompt-utils.sh path for you.
Thus, to properly source and enable all the bash prompt helpers in your Bash tools, add the following prelude to your scripts:
source "$LLM_PROMPT_UTILS_FILE"
Included Utility Functions
Below are the built-in bash prompt helpers that can be used to enhance user interaction with your tool scripts.
input
Prompt for text input
Example With Validation:
text=$(with_validation 'input "Please enter something:"' validate_present 2>/dev/tty)
Example Without Validation:
text=$(input "Please enter something:" 2>/dev/tty)
confirm
Show a confirm dialog with options for yes/no
Example:
confirmed=$(confirm "Do the thing?" 2>/dev/tty)
if [[ $confirmed == "0" ]]; then echo "No"; else echo "Yes"; fi
list
Renders a text based list of options that can be selected by the user using up, down, and enter keys that then returns the chosen option.
Example:
options=("one" "two" "three" "four")
choice=$(list "Select an item" "${options[@]}" 2>/dev/tty)
echo "Your choice: ${options[$choice]}"
checkbox
Render a text based list of options, where multiple options can be selected by the user using down, up, and enter keys that then returns the chosen options.
Example:
options=("one" "two" "three" "four")
checked=$(checkbox "Select one or more items" "${options[@]}" 2>/dev/tty)
echo "Your choices: ${checked}"
password
Show a password prompt displaying stars for each character typed.
Example With Validation:
validate_password() {
if [[ ${#1} -lt 10 ]]; then
echo "Password must be at least 10 characters"
exit 1
fi
}
pass=$(with_validate 'password "Enter your password"' validate_password 2>/dev/tty)
Example Without Validation:
pass="$(password "Enter your password:" 2>/dev/tty)"
editor
Open the default editor ($EDITOR); if none is set, default back to vi
Example:
text=$(editor "Please enter something in the editor" 2>/dev/tty)
echo -e "You wrote:\n${text}"
with_validate
Evaluate the given prompt command with validation. This prompts the user for input until the validation functions returns 0.
Example:
# Using the built-in 'validate_present' validator
text=$(with_validate 'input "Please enter something and confirm with enter"' validate_present 2>/dev/tty)
# Using a custom validator; e.g. for password
validate_password() {
if [[ ${#1} -lt 10 ]]; then
echo "Password needs to be at least 10 characters"
exit 1
fi
}
pass=$(with_validate 'password "Enter random password"' validate_password 2>/dev/tty)
validate_present
Validate that the prompt returned a value.
Example:
text=$(with_validate 'input "Please enter something and confirm with enter"' validate_present 2>/dev/tty)
detect_os
Detect the current OS.
Returns one of the following:
solarismacoslinuxbsdwindowsunknown
Example:
detect_os
get_opener
Determines the Os-specific file opening command (i.e. the command to open anything)
Example:
# Returns 'xdg-open'
get_opener
open_link
Opens the given link in the default browser
Example:
open_link https://www.google.com
guard_operation
Prompt for permission to run an operation.
Can be disabled by setting the environment variable AUTO_CONFIRM.
Example:
guard_operation "Execute SQL?"
_run_sql
guard_path
Prompt for permission to perform path operations.
Can be disabled by setting the environment variable AUTO_CONFIRM.
Example:*
guard_path "$target_path" "Remove '$target_path'?"
rm -rf "$target_path"
patch_file
Patch a file and show a diff using the default diff viewer. Uses git diff syntax.
Example:
new_contents="$(patch_file "$path" file.patch)"
error
Log an error
warn
Log a warning
info
Log info
debug
Log a debug message
trace
Log a trace message
Colored Output
The following commands allow users to output text in specific colors.
redgreengoldbluemagentacyanwhite
Example:
red "This will be red"
yellow "This will be yellow"