logger

log

Idea

Provide a unified and simple way for the whole application to print information. It should be easy to use, and capable of displaying a nice terminal-ui in all contexts.

Usage

import logger

[...]

var log = logger.NewLogger()
// Change settings as needed
log.Info("hello world")

Implicit Configuration

• Environment variable $NO_COLOR is respected automatically by disabling color if set to non-empty value.
• Environment variable $<MYAPP>_NO_COLOR is respected automatically by disabling color if set to non-empty value. Value for <MYAPP> is retrieved by os.Args[0] put to uppercase.
• Environment variable $TERM is respected automatically by disabling color and animations if set to dumb.

Variables

• log.SpinnerUpdateInterval - Has a default value.
• log.LogLevel - Has a default value.

Methods

Write to stdout

• log.Println(message)

Change settings

• log.NoColor()

Write log messages with time, level and message to stderr

• log.Debug(message)
• log.Info(message)
• log.Warn(message)
• log.Error(message)
• log.Fatal(message)

Write updatable line to stderr, update it, complete it and go on with next line

• log.Update(message) & Complete(message)
• log.SpinningUpdate(message) & SpinningComplete(message) Uses Braille-chars for the spinner: ['⣾', '⣷', '⣯', '⣟', '⡿', '⢿', '⣻', '⣽'] and '✓' for signalling a completed action.
• log.SpinningXOfInit(total, message), log.SpinningXOfUpdate() & log.SpinningXOfComplete()

Make sure to follow Update with Complete, SpinningUpdate with SpinningComplete, and SpinningXOfInit with SpinningXOfComplete, respectively. Doing so also enables you to change 'Downloading X...' to 'Downloaded X' in case of SpinningUpdateComplete.

Todo's

• Braille-spinner for in-progress replace with green, yellow, red ['✓'] on completion - for yellow and red show messages in stderr

• Check compatibility with piping, stdin, redirecting to file

• FAIL level is always enabled if FAIL is used, it prints error code error message expected remediation url for more information / how to raise a bug

• --json prints json-structured output (zerolog?)

  • level
  • timestamp
  • message

• --verbose, -v for INFO level Enables SUC, ERR, WRN, INF messages

• -vvv or $DEBUG for DEBUG level Enables SUC, ERR, WRN, INF, DBG messages

• --no-color disables all colors

• --quiet/-q disables statusupdates (don't do anything with Update(), SpinningUpdate() or UpdateXOfTotal() or Complete() or SpinningComplete()) on stderr

• nextSpinner() returns the next element of braille spinner needs internal variable with currentIndex

• SpinningUpdate(message) -> writes to internal variable "message" and sets "spinnerEnabled" to true must trigger Update() every 0.2s or similar with nextSpinner()

• SpinningComplete(message) -> replaces spinner with (green) checkmark, writes final message, cleans previous message

• Update(message) -> writes to internal variable "message" and sets spinnerEnabled to false

• Complete(finalMessage) -> finishes last line by printing final '$message\n', , cleans previous message

• UpdateXOfTotal(message, total) -> calls Update('( X / total )' + message), where both X and total have the same character length

• --instant for showing results immediately after they are available instead of finishing the scan first
• make sure ALL_PROXY, HTTP_PROXY, HTTPS_PROXY, NO_PROXY are respected
• make use of $LINES and $COLUMNS to format output