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A tail -f like implementation in javascript with included colorizing support
JavaScript
branch: master

Add replay functionality to jstail

* change order of file and options for easier usage
* update readme with new option replay
latest commit 8525e45d92
@playerwtf authored

README.md

js-tail-log

A tail -f like implementation in javascript with included colorizing support

Installation

Either through forking or by using npm (the recommended way):

npm install -g js-tail-log

jstail will be installed into your bin path.

Usage

jstail [file][options]

Flags

color

Deactivates colored output:
-c --color

custom config

Pass a custom config [path]:
-s --setting <config>

silent

Suppress all errors:
-q --quiet

debug mode

Show debug messages:
-d --debug

replay

Replay a log file with an optional interval(default 1sec):
-r --replay <interval>

Configuration

jstail can work with different configurations. It can colorize output based on some patterns. When hundreds of log messages appear its hard to see which of them are errors and which are just info messages.

The default configuration is the following:

{
    "initLines": 10,
    "colorNeutral": "\u001b[0m",
    "patterns": [
        {
            "name": "debug",
            "expr": "(DEBUG)",
            "color": "\u001b[35m"
        }, {
            "name": "info",
            "expr": "(INFO)",
            "color": "\u001b[36m"
        }, {
            "name": "warn",
            "expr": "(WARN)",
            "color": "\u001b[33m"
        }, {
            "name": "error",
            "expr": "(ERROR)",
            "color": "\u001b[31m"
        }
    ]
}

The expressions are matched as regular expressions and can be as simple as those above.

jstail will look in your homefolder for a file .jstail then in your current directory and finally you can also pass a custom configuration with the --setting parameter.

Configuration order:

setting config > current directory config > home config > defaults

Make sure you’re using a valid json file as configuration or else it will be ignored

Output

Colored output example:

output

Debugging (writer)

Used for testing only. Writes normal-, multiline- or mixed messages into a file

Usage

writer [options][file]

Flags

interval

Set a custom interval default is 1000ms:
--i, --interval <n>

multiline

Print multilines instead of normal messages:
-m, --multiline

random

Print random messages using both normal and multiline messages:
-r --random

normal

Print normal messages (used by default):
-n --normal

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