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What's all this, then?

This is an example project demonstrating an NSTextView subclass which does programmatic modification of if its contents based on user actions. This would be useful, for example, in a programmer's text editor, whereby it could automatically insert close braces when one types an open brace, or automatically indent when one presses return.

Why?

Because I needed this functionality for a project I'm writing. I faced several challenges:

  1. I had been calling insertText: to perform programmatic changes, and although this appeared to work, I was troubled by some verbiage in NSTextView's documentation for insertText:

    This method is the entry point for inserting text typed by the user and is generally not suitable for other purposes. Programmatic modification of the text is best done by operating on the text storage directly.

    Problem with that is, modifying text by directly manipulating the text storage completely bypasses Undo. I think the proper answer is to do you own undo handling in your text storage, but I did not want to do this.

    I posted this question to stackoverflow, without much in the way of an answer.

  2. I had issues getting Undo to work correctly, and I was apparently not alone, as witnessed by this question on stackoverflow.

So the point of this is to demonstrate an NSTextView subclass which does programmatic modification of its contents using insertText: and without screwing up Undo.

How's it work?

ZPTextView is an NSTextView subclass. It overrides insertText:, and does it's modification of its contents there. Additionally, it does its own undo grouping in insertText:, basicallly by creating an undo group for each insertText: call. Additionally, it overrides replaceCharactersInRange: to also call shouldChangeTextInRange:, also to keep undo working properly.

Note that this is code in progress. It's basically a cut-down version of code I'm using in a project I'm working on, and I've not actually shipped it (yet). So far, however, it appears to work well.

Who's responsible for this?

I'm Zacharias Pasternack, lead developer for Fat Apps, LLC. You can check out my blog, or follow me on Twitter or App.net.

Can I use this code?

You bet. Do whatever you want with it. If you find issues, please let me know. If you make it better, please let me know.

License

The code is available under a Modified BSD License. See the LICENSE file for more info.

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Example NSTextView subclass for programmatic modification

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n 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;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} 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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What's all this, then?
This is an example project demonstrating an NSTextView subclass which does programmatic modification
of if its contents based on user actions. This would be useful, for example, in a programmer's
text editor, whereby it could automatically insert close braces when one types an open brace, or
automatically indent when one presses return.
Why?
Because I needed this functionality for a project I'm writing. I faced several challenges:
  1. I had been calling insertText: to perform programmatic changes, and although this appeared to
work, I was troubled by some verbiage in NSTextView's documentation for insertText:
    This method is the entry point for inserting text typed by the user and is generally
not suitable for other purposes. Programmatic modification of the text is best done
by operating on the text storage directly.
    Problem with that is, modifying text by directly manipulating the text storage completely
bypasses Undo. I think the proper answer is to do you own undo handling in your text
storage, but I did not want to do this.
    I posted this question to stackoverflow, without much in the way of an answer.
  2. I had issues getting Undo to work correctly, and I was apparently not alone, as witnessed
by this question on stackoverflow.
So the point of this is to demonstrate an NSTextView subclass which does programmatic modification
of its contents using insertText: and without screwing up Undo.
How's it work?
ZPTextView is an NSTextView subclass. It overrides insertText:, and does it's modification of
its contents there. Additionally, it does its own undo grouping in insertText:, basicallly by
creating an undo group for each insertText: call. Additionally, it overrides
replaceCharactersInRange: to also call shouldChangeTextInRange:, also to keep undo working
properly.
Note that this is code in progress. It's basically a cut-down version of code I'm using in a project
I'm working on, and I've not actually shipped it (yet). So far, however, it appears to work well.
Who's responsible for this?
I'm Zacharias Pasternack, lead developer for Fat Apps, LLC. You can check
out my blog, or follow me on Twitter
or App.net.
Can I use this code?
You bet. Do whatever you want with it. If you find issues, please let me know. If you make it
better, please let me know.
License
The code is available under a Modified BSD License. See the LICENSE file for more info.
About
Example NSTextView subclass for programmatic modification
Resources
Readme
Activity
Stars
7 stars
Watchers
1 watching
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3 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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What's all this, then?
This is an example project demonstrating an NSTextView subclass which does programmatic modification
of if its contents based on user actions. This would be useful, for example, in a programmer's
text editor, whereby it could automatically insert close braces when one types an open brace, or
automatically indent when one presses return.
Why?
Because I needed this functionality for a project I'm writing. I faced several challenges:
  1. I had been calling insertText: to perform programmatic changes, and although this appeared to
work, I was troubled by some verbiage in NSTextView's documentation for insertText:
    This method is the entry point for inserting text typed by the user and is generally
not suitable for other purposes. Programmatic modification of the text is best done
by operating on the text storage directly.
    Problem with that is, modifying text by directly manipulating the text storage completely
bypasses Undo. I think the proper answer is to do you own undo handling in your text
storage, but I did not want to do this.
    I posted this question to stackoverflow, without much in the way of an answer.
  2. I had issues getting Undo to work correctly, and I was apparently not alone, as witnessed
by this question on stackoverflow.
So the point of this is to demonstrate an NSTextView subclass which does programmatic modification
of its contents using insertText: and without screwing up Undo.
How's it work?
ZPTextView is an NSTextView subclass. It overrides insertText:, and does it's modification of
its contents there. Additionally, it does its own undo grouping in insertText:, basicallly by
creating an undo group for each insertText: call. Additionally, it overrides
replaceCharactersInRange: to also call shouldChangeTextInRange:, also to keep undo working
properly.
Note that this is code in progress. It's basically a cut-down version of code I'm using in a project
I'm working on, and I've not actually shipped it (yet). So far, however, it appears to work well.
Who's responsible for this?
I'm Zacharias Pasternack, lead developer for Fat Apps, LLC. You can check
out my blog, or follow me on Twitter
or App.net.
Can I use this code?
You bet. Do whatever you want with it. If you find issues, please let me know. If you make it
better, please let me know.
License
The code is available under a Modified BSD License. See the LICENSE file for more info.
About
Example NSTextView subclass for programmatic modification
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Readme
Activity
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1 watching
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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CustomTextView
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Repository files navigation
What's all this, then?
This is an example project demonstrating an NSTextView subclass which does programmatic modification
of if its contents based on user actions. This would be useful, for example, in a programmer's
text editor, whereby it could automatically insert close braces when one types an open brace, or
automatically indent when one presses return.
Why?
Because I needed this functionality for a project I'm writing. I faced several challenges:
  1. I had been calling insertText: to perform programmatic changes, and although this appeared to
work, I was troubled by some verbiage in NSTextView's documentation for insertText:
    This method is the entry point for inserting text typed by the user and is generally
not suitable for other purposes. Programmatic modification of the text is best done
by operating on the text storage directly.
    Problem with that is, modifying text by directly manipulating the text storage completely
bypasses Undo. I think the proper answer is to do you own undo handling in your text
storage, but I did not want to do this.
    I posted this question to stackoverflow, without much in the way of an answer.
  2. I had issues getting Undo to work correctly, and I was apparently not alone, as witnessed
by this question on stackoverflow.
So the point of this is to demonstrate an NSTextView subclass which does programmatic modification
of its contents using insertText: and without screwing up Undo.
How's it work?
ZPTextView is an NSTextView subclass. It overrides insertText:, and does it's modification of
its contents there. Additionally, it does its own undo grouping in insertText:, basicallly by
creating an undo group for each insertText: call. Additionally, it overrides
replaceCharactersInRange: to also call shouldChangeTextInRange:, also to keep undo working
properly.
Note that this is code in progress. It's basically a cut-down version of code I'm using in a project
I'm working on, and I've not actually shipped it (yet). So far, however, it appears to work well.
Who's responsible for this?
I'm Zacharias Pasternack, lead developer for Fat Apps, LLC. You can check
out my blog, or follow me on Twitter
or App.net.
Can I use this code?
You bet. Do whatever you want with it. If you find issues, please let me know. If you make it
better, please let me know.
License
The code is available under a Modified BSD License. See the LICENSE file for more info.
About
Example NSTextView subclass for programmatic modification
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Readme
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1 watching
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3 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} 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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CustomTextView.xcodeproj
CustomTextView
CustomTextView
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Readme.md
Repository files navigation
What's all this, then?
This is an example project demonstrating an NSTextView subclass which does programmatic modification
of if its contents based on user actions. This would be useful, for example, in a programmer's
text editor, whereby it could automatically insert close braces when one types an open brace, or
automatically indent when one presses return.
Why?
Because I needed this functionality for a project I'm writing. I faced several challenges:
  1. I had been calling insertText: to perform programmatic changes, and although this appeared to
work, I was troubled by some verbiage in NSTextView's documentation for insertText:
    This method is the entry point for inserting text typed by the user and is generally
not suitable for other purposes. Programmatic modification of the text is best done
by operating on the text storage directly.
    Problem with that is, modifying text by directly manipulating the text storage completely
bypasses Undo. I think the proper answer is to do you own undo handling in your text
storage, but I did not want to do this.
    I posted this question to stackoverflow, without much in the way of an answer.
  2. I had issues getting Undo to work correctly, and I was apparently not alone, as witnessed
by this question on stackoverflow.
So the point of this is to demonstrate an NSTextView subclass which does programmatic modification
of its contents using insertText: and without screwing up Undo.
How's it work?
ZPTextView is an NSTextView subclass. It overrides insertText:, and does it's modification of
its contents there. Additionally, it does its own undo grouping in insertText:, basicallly by
creating an undo group for each insertText: call. Additionally, it overrides
replaceCharactersInRange: to also call shouldChangeTextInRange:, also to keep undo working
properly.
Note that this is code in progress. It's basically a cut-down version of code I'm using in a project
I'm working on, and I've not actually shipped it (yet). So far, however, it appears to work well.
Who's responsible for this?
I'm Zacharias Pasternack, lead developer for Fat Apps, LLC. You can check
out my blog, or follow me on Twitter
or App.net.
Can I use this code?
You bet. Do whatever you want with it. If you find issues, please let me know. If you make it
better, please let me know.
License
The code is available under a Modified BSD License. See the LICENSE file for more info.
About
Example NSTextView subclass for programmatic modification
Resources
Readme
Activity
Stars
7 stars
Watchers
1 watching
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3 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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CustomTextView
CustomTextView
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Readme.md
Repository files navigation
What's all this, then?
This is an example project demonstrating an NSTextView subclass which does programmatic modification
of if its contents based on user actions. This would be useful, for example, in a programmer's
text editor, whereby it could automatically insert close braces when one types an open brace, or
automatically indent when one presses return.
Why?
Because I needed this functionality for a project I'm writing. I faced several challenges:
  1. I had been calling insertText: to perform programmatic changes, and although this appeared to
work, I was troubled by some verbiage in NSTextView's documentation for insertText:
    This method is the entry point for inserting text typed by the user and is generally
not suitable for other purposes. Programmatic modification of the text is best done
by operating on the text storage directly.
    Problem with that is, modifying text by directly manipulating the text storage completely
bypasses Undo. I think the proper answer is to do you own undo handling in your text
storage, but I did not want to do this.
    I posted this question to stackoverflow, without much in the way of an answer.
  2. I had issues getting Undo to work correctly, and I was apparently not alone, as witnessed
by this question on stackoverflow.
So the point of this is to demonstrate an NSTextView subclass which does programmatic modification
of its contents using insertText: and without screwing up Undo.
How's it work?
ZPTextView is an NSTextView subclass. It overrides insertText:, and does it's modification of
its contents there. Additionally, it does its own undo grouping in insertText:, basicallly by
creating an undo group for each insertText: call. Additionally, it overrides
replaceCharactersInRange: to also call shouldChangeTextInRange:, also to keep undo working
properly.
Note that this is code in progress. It's basically a cut-down version of code I'm using in a project
I'm working on, and I've not actually shipped it (yet). So far, however, it appears to work well.
Who's responsible for this?
I'm Zacharias Pasternack, lead developer for Fat Apps, LLC. You can check
out my blog, or follow me on Twitter
or App.net.
Can I use this code?
You bet. Do whatever you want with it. If you find issues, please let me know. If you make it
better, please let me know.
License
The code is available under a Modified BSD License. See the LICENSE file for more info.
About
Example NSTextView subclass for programmatic modification
Resources
Readme
Activity
Stars
7 stars
Watchers
1 watching
Forks
3 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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CustomTextView.xcodeproj
CustomTextView
CustomTextView
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Readme.md
Repository files navigation
What's all this, then?
This is an example project demonstrating an NSTextView subclass which does programmatic modification
of if its contents based on user actions. This would be useful, for example, in a programmer's
text editor, whereby it could automatically insert close braces when one types an open brace, or
automatically indent when one presses return.
Why?
Because I needed this functionality for a project I'm writing. I faced several challenges:
  1. I had been calling insertText: to perform programmatic changes, and although this appeared to
work, I was troubled by some verbiage in NSTextView's documentation for insertText:
    This method is the entry point for inserting text typed by the user and is generally
not suitable for other purposes. Programmatic modification of the text is best done
by operating on the text storage directly.
    Problem with that is, modifying text by directly manipulating the text storage completely
bypasses Undo. I think the proper answer is to do you own undo handling in your text
storage, but I did not want to do this.
    I posted this question to stackoverflow, without much in the way of an answer.
  2. I had issues getting Undo to work correctly, and I was apparently not alone, as witnessed
by this question on stackoverflow.
So the point of this is to demonstrate an NSTextView subclass which does programmatic modification
of its contents using insertText: and without screwing up Undo.
How's it work?
ZPTextView is an NSTextView subclass. It overrides insertText:, and does it's modification of
its contents there. Additionally, it does its own undo grouping in insertText:, basicallly by
creating an undo group for each insertText: call. Additionally, it overrides
replaceCharactersInRange: to also call shouldChangeTextInRange:, also to keep undo working
properly.
Note that this is code in progress. It's basically a cut-down version of code I'm using in a project
I'm working on, and I've not actually shipped it (yet). So far, however, it appears to work well.
Who's responsible for this?
I'm Zacharias Pasternack, lead developer for Fat Apps, LLC. You can check
out my blog, or follow me on Twitter
or App.net.
Can I use this code?
You bet. Do whatever you want with it. If you find issues, please let me know. If you make it
better, please let me know.
License
The code is available under a Modified BSD License. See the LICENSE file for more info.
About
Example NSTextView subclass for programmatic modification
Resources
Readme
Activity
Stars
7 stars
Watchers
1 watching
Forks
3 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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What's all this, then?
This is an example project demonstrating an NSTextView subclass which does programmatic modification
of if its contents based on user actions. This would be useful, for example, in a programmer's
text editor, whereby it could automatically insert close braces when one types an open brace, or
automatically indent when one presses return.
Why?
Because I needed this functionality for a project I'm writing. I faced several challenges:
  1. I had been calling insertText: to perform programmatic changes, and although this appeared to
work, I was troubled by some verbiage in NSTextView's documentation for insertText:
    This method is the entry point for inserting text typed by the user and is generally
not suitable for other purposes. Programmatic modification of the text is best done
by operating on the text storage directly.
    Problem with that is, modifying text by directly manipulating the text storage completely
bypasses Undo. I think the proper answer is to do you own undo handling in your text
storage, but I did not want to do this.
    I posted this question to stackoverflow, without much in the way of an answer.
  2. I had issues getting Undo to work correctly, and I was apparently not alone, as witnessed
by this question on stackoverflow.
So the point of this is to demonstrate an NSTextView subclass which does programmatic modification
of its contents using insertText: and without screwing up Undo.
How's it work?
ZPTextView is an NSTextView subclass. It overrides insertText:, and does it's modification of
its contents there. Additionally, it does its own undo grouping in insertText:, basicallly by
creating an undo group for each insertText: call. Additionally, it overrides
replaceCharactersInRange: to also call shouldChangeTextInRange:, also to keep undo working
properly.
Note that this is code in progress. It's basically a cut-down version of code I'm using in a project
I'm working on, and I've not actually shipped it (yet). So far, however, it appears to work well.
Who's responsible for this?
I'm Zacharias Pasternack, lead developer for Fat Apps, LLC. You can check
out my blog, or follow me on Twitter
or App.net.
Can I use this code?
You bet. Do whatever you want with it. If you find issues, please let me know. If you make it
better, please let me know.
License
The code is available under a Modified BSD License. See the LICENSE file for more info.
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Example NSTextView subclass for programmatic modification
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