Read a patch

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Read a patch

A unified diff as what changed, file by file, with the added and removed counted.

It runs entirely in this browser tab: the code you paste is never uploaded, and nothing here is executed, built or fetched — it is read and something else is written. Open your browser's network panel and try it.

What it takes

A unified diff document.

An example

diff --git a/src/main.rs b/src/main.rs
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,5 @@
 fn main() {
-    println!("hi");
+    println!("hello");
+    println!("world");
 }

Settings

Show
Choices: By file, Every changed line.
Show unchanged lines
The lines that did not change, for the ones that did to be read against.

How to use it

  1. Paste your text into the box above, or open a file.
  2. Adjust the settings beside it until the result is what you wanted.
  3. Copy the result, or save it as a file. The result updates as you type.

Questions

Is my code uploaded anywhere?
No. The whole application is carried as WebAssembly and runs on your own device. That matters here as much as anywhere: a curl command pasted out of a terminal has a live token in it, a stack trace has your customers' identifiers in it, and a configuration file has a password in the middle of a connection address.
Does anything here run what I paste?
Never. The command explainer explains and does not execute; the Dockerfile reader reads and does not build; the request builder writes a command and does not send it. Each tool says so on its own result, and each says what that costs it — a linter that did not build the image cannot tell you the image builds.
Will an escape survive a round trip?
Yes, and there is a test that says so: every language's escaper has its unescaper beside it, and an awkward string with quotation marks, backslashes, tabs, a null and an emoji in it goes through both for every language on every run of the test suite.
Why does it refuse a pattern instead of matching nothing?
Because matching nothing looks like an answer. The glob matcher reads a stated subset — the stars, the question mark, character classes, brace lists and a leading negation — and a pattern using anything else comes back named rather than quietly matching none of your files.

Other tools for the repository's own files

Git commands
The command for the thing you meant, with the ones that throw work away named.

Changelog
Commits grouped by the kind of change, with the breaking ones on their own at the top.

Semantic versions
Versions read, sorted and tested against a range — with the pre-release rule the right way round.

Ignore rules
Rules from templates, and a path tested against them by the rule that wins — the last one.

Choose a licence
Four answers and a licence, with the short ones in full and the long ones pointed at.

Readme badges
Badges drawn here as SVG rather than fetched from a service that may go away.

All forty tools