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tailcat CI

A Node.js file watcher like tail +0f

Install

$ npm install tailcat --save

Key properties

  • Can watch non-existing files that still need to be created
  • Can handle file deletion/removal
  • 0 external dependencies
  • Excellent test coverage
  • Can handle fast updating files

Usage

import{TailCat}from'tailcat'consttailCat=newTailCat('./source/foo.txt');// Configures the file that is watchedawaittailcat.watch();// Starts watching the filetailcat.on('data',data=>{// Event handler, will emit each line of the watched file//...});constcursor=awaittailCat.unwatch();// Stops watching the file and returns the current cursor// ... some time passesawaittailCat.watch({cursor});// Starts watching again from the cursor. Will eagerly read the data written during the pause if the cursor is lower then the file size.

API

TailCat(path)

Constructor for a tailcat instance

path

Type: String Description: Path to the file. The file itself needs to be newline delimited (CSV, NDJSON, etc...). Binary files are not supported.

watch([options]): Promise<undefined>

Starts watching a file.

options.cursor

Type: number Optional: true Description: The cursor from there to start watching. If no cursor is provided, it will continue reading from the cursor that has stored internally in the TailCat instance. If no read operations have been performed yet, it will start from position 0.

unwatch(): Promise<number>

Stops watching a file and returns the current cursor position.

on('data', (data: string) => {...})

Emits events when a line has been processed from the watched file

Contributions

I welcome any contributions.

Author

  • Simon Jang

About

Watch and tail a file

Topics

fsnodejstailwatch

Resources

Readme
MIT license
Activity

Stars

1 star

Watchers

1 watching

Forks

0 forks
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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tailcat CI
A Node.js file watcher like tail +0f
Install
$ npm install tailcat --save
Key properties
  • Can watch non-existing files that still need to be created
  • Can handle file deletion/removal
  • 0 external dependencies
  • Excellent test coverage
  • Can handle fast updating files
Usage
import{TailCat}from'tailcat'consttailCat=newTailCat('./source/foo.txt');// Configures the file that is watchedawaittailcat.watch();// Starts watching the filetailcat.on('data',data=>{// Event handler, will emit each line of the watched file//...});constcursor=awaittailCat.unwatch();// Stops watching the file and returns the current cursor// ... some time passesawaittailCat.watch({cursor});// Starts watching again from the cursor. Will eagerly read the data written during the pause if the cursor is lower then the file size.
API
TailCat(path)
Constructor for a tailcat instance
path
Type: String
Description: Path to the file. The file itself needs to be newline delimited (CSV, NDJSON, etc...). Binary files are not supported.
watch([options]): Promise<undefined>
Starts watching a file.
options.cursor
Type: number
Optional: true
Description: The cursor from there to start watching. If no cursor is provided, it will continue reading from the cursor that has stored internally in the TailCat instance. If no read operations have been performed yet, it will start from position 0.
unwatch(): Promise<number>
Stops watching a file and returns the current cursor position.
on('data', (data: string) => {...})
Emits events when a line has been processed from the watched file
Contributions
I welcome any contributions.
Author
  • Simon Jang
About
Watch and tail a file
Topics
fsnodejstailwatch
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
tailcat CI
A Node.js file watcher like tail +0f
Install
$ npm install tailcat --save
Key properties
  • Can watch non-existing files that still need to be created
  • Can handle file deletion/removal
  • 0 external dependencies
  • Excellent test coverage
  • Can handle fast updating files
Usage
import{TailCat}from'tailcat'consttailCat=newTailCat('./source/foo.txt');// Configures the file that is watchedawaittailcat.watch();// Starts watching the filetailcat.on('data',data=>{// Event handler, will emit each line of the watched file//...});constcursor=awaittailCat.unwatch();// Stops watching the file and returns the current cursor// ... some time passesawaittailCat.watch({cursor});// Starts watching again from the cursor. Will eagerly read the data written during the pause if the cursor is lower then the file size.
API
TailCat(path)
Constructor for a tailcat instance
path
Type: String
Description: Path to the file. The file itself needs to be newline delimited (CSV, NDJSON, etc...). Binary files are not supported.
watch([options]): Promise<undefined>
Starts watching a file.
options.cursor
Type: number
Optional: true
Description: The cursor from there to start watching. If no cursor is provided, it will continue reading from the cursor that has stored internally in the TailCat instance. If no read operations have been performed yet, it will start from position 0.
unwatch(): Promise<number>
Stops watching a file and returns the current cursor position.
on('data', (data: string) => {...})
Emits events when a line has been processed from the watched file
Contributions
I welcome any contributions.
Author
  • Simon Jang
About
Watch and tail a file
Topics
fsnodejstailwatch
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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tailcat CI
A Node.js file watcher like tail +0f
Install
$ npm install tailcat --save
Key properties
  • Can watch non-existing files that still need to be created
  • Can handle file deletion/removal
  • 0 external dependencies
  • Excellent test coverage
  • Can handle fast updating files
Usage
import{TailCat}from'tailcat'consttailCat=newTailCat('./source/foo.txt');// Configures the file that is watchedawaittailcat.watch();// Starts watching the filetailcat.on('data',data=>{// Event handler, will emit each line of the watched file//...});constcursor=awaittailCat.unwatch();// Stops watching the file and returns the current cursor// ... some time passesawaittailCat.watch({cursor});// Starts watching again from the cursor. Will eagerly read the data written during the pause if the cursor is lower then the file size.
API
TailCat(path)
Constructor for a tailcat instance
path
Type: String
Description: Path to the file. The file itself needs to be newline delimited (CSV, NDJSON, etc...). Binary files are not supported.
watch([options]): Promise<undefined>
Starts watching a file.
options.cursor
Type: number
Optional: true
Description: The cursor from there to start watching. If no cursor is provided, it will continue reading from the cursor that has stored internally in the TailCat instance. If no read operations have been performed yet, it will start from position 0.
unwatch(): Promise<number>
Stops watching a file and returns the current cursor position.
on('data', (data: string) => {...})
Emits events when a line has been processed from the watched file
Contributions
I welcome any contributions.
Author
  • Simon Jang
About
Watch and tail a file
Topics
fsnodejstailwatch
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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BranchesTags
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tailcat CI
A Node.js file watcher like tail +0f
Install
$ npm install tailcat --save
Key properties
  • Can watch non-existing files that still need to be created
  • Can handle file deletion/removal
  • 0 external dependencies
  • Excellent test coverage
  • Can handle fast updating files
Usage
import{TailCat}from'tailcat'consttailCat=newTailCat('./source/foo.txt');// Configures the file that is watchedawaittailcat.watch();// Starts watching the filetailcat.on('data',data=>{// Event handler, will emit each line of the watched file//...});constcursor=awaittailCat.unwatch();// Stops watching the file and returns the current cursor// ... some time passesawaittailCat.watch({cursor});// Starts watching again from the cursor. Will eagerly read the data written during the pause if the cursor is lower then the file size.
API
TailCat(path)
Constructor for a tailcat instance
path
Type: String
Description: Path to the file. The file itself needs to be newline delimited (CSV, NDJSON, etc...). Binary files are not supported.
watch([options]): Promise<undefined>
Starts watching a file.
options.cursor
Type: number
Optional: true
Description: The cursor from there to start watching. If no cursor is provided, it will continue reading from the cursor that has stored internally in the TailCat instance. If no read operations have been performed yet, it will start from position 0.
unwatch(): Promise<number>
Stops watching a file and returns the current cursor position.
on('data', (data: string) => {...})
Emits events when a line has been processed from the watched file
Contributions
I welcome any contributions.
Author
  • Simon Jang
About
Watch and tail a file
Topics
fsnodejstailwatch
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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BranchesTags
Repository files navigation
tailcat CI
A Node.js file watcher like tail +0f
Install
$ npm install tailcat --save
Key properties
  • Can watch non-existing files that still need to be created
  • Can handle file deletion/removal
  • 0 external dependencies
  • Excellent test coverage
  • Can handle fast updating files
Usage
import{TailCat}from'tailcat'consttailCat=newTailCat('./source/foo.txt');// Configures the file that is watchedawaittailcat.watch();// Starts watching the filetailcat.on('data',data=>{// Event handler, will emit each line of the watched file//...});constcursor=awaittailCat.unwatch();// Stops watching the file and returns the current cursor// ... some time passesawaittailCat.watch({cursor});// Starts watching again from the cursor. Will eagerly read the data written during the pause if the cursor is lower then the file size.
API
TailCat(path)
Constructor for a tailcat instance
path
Type: String
Description: Path to the file. The file itself needs to be newline delimited (CSV, NDJSON, etc...). Binary files are not supported.
watch([options]): Promise<undefined>
Starts watching a file.
options.cursor
Type: number
Optional: true
Description: The cursor from there to start watching. If no cursor is provided, it will continue reading from the cursor that has stored internally in the TailCat instance. If no read operations have been performed yet, it will start from position 0.
unwatch(): Promise<number>
Stops watching a file and returns the current cursor position.
on('data', (data: string) => {...})
Emits events when a line has been processed from the watched file
Contributions
I welcome any contributions.
Author
  • Simon Jang
About
Watch and tail a file
Topics
fsnodejstailwatch
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
tailcat CI
A Node.js file watcher like tail +0f
Install
$ npm install tailcat --save
Key properties
  • Can watch non-existing files that still need to be created
  • Can handle file deletion/removal
  • 0 external dependencies
  • Excellent test coverage
  • Can handle fast updating files
Usage
import{TailCat}from'tailcat'consttailCat=newTailCat('./source/foo.txt');// Configures the file that is watchedawaittailcat.watch();// Starts watching the filetailcat.on('data',data=>{// Event handler, will emit each line of the watched file//...});constcursor=awaittailCat.unwatch();// Stops watching the file and returns the current cursor// ... some time passesawaittailCat.watch({cursor});// Starts watching again from the cursor. Will eagerly read the data written during the pause if the cursor is lower then the file size.
API
TailCat(path)
Constructor for a tailcat instance
path
Type: String
Description: Path to the file. The file itself needs to be newline delimited (CSV, NDJSON, etc...). Binary files are not supported.
watch([options]): Promise<undefined>
Starts watching a file.
options.cursor
Type: number
Optional: true
Description: The cursor from there to start watching. If no cursor is provided, it will continue reading from the cursor that has stored internally in the TailCat instance. If no read operations have been performed yet, it will start from position 0.
unwatch(): Promise<number>
Stops watching a file and returns the current cursor position.
on('data', (data: string) => {...})
Emits events when a line has been processed from the watched file
Contributions
I welcome any contributions.
Author
  • Simon Jang
About
Watch and tail a file
Topics
fsnodejstailwatch
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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tailcat CI
A Node.js file watcher like tail +0f
Install
$ npm install tailcat --save
Key properties
  • Can watch non-existing files that still need to be created
  • Can handle file deletion/removal
  • 0 external dependencies
  • Excellent test coverage
  • Can handle fast updating files
Usage
import{TailCat}from'tailcat'consttailCat=newTailCat('./source/foo.txt');// Configures the file that is watchedawaittailcat.watch();// Starts watching the filetailcat.on('data',data=>{// Event handler, will emit each line of the watched file//...});constcursor=awaittailCat.unwatch();// Stops watching the file and returns the current cursor// ... some time passesawaittailCat.watch({cursor});// Starts watching again from the cursor. Will eagerly read the data written during the pause if the cursor is lower then the file size.
API
TailCat(path)
Constructor for a tailcat instance
path
Type: String
Description: Path to the file. The file itself needs to be newline delimited (CSV, NDJSON, etc...). Binary files are not supported.
watch([options]): Promise<undefined>
Starts watching a file.
options.cursor
Type: number
Optional: true
Description: The cursor from there to start watching. If no cursor is provided, it will continue reading from the cursor that has stored internally in the TailCat instance. If no read operations have been performed yet, it will start from position 0.
unwatch(): Promise<number>
Stops watching a file and returns the current cursor position.
on('data', (data: string) => {...})
Emits events when a line has been processed from the watched file
Contributions
I welcome any contributions.
Author
  • Simon Jang
About
Watch and tail a file
Topics
fsnodejstailwatch
Resources
Readme
MIT license
Activity
Stars
1 star
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Used by
Contributors
Languages