What is a diff and what does it show
A diff is a file that displays the changes made to one or more files by either saving those changes or opening them in an editor. A diff can show the changes made to a file or a set of files. When it is showing changes made to a file, it is called an edited file diff. This can be useful in revealing the differences that were made in editing one piece of text between two different versions. It is also useful for comparing different versions of the same file.
A diff can also be used to compare two different files to see what the changes are between them. This is helpful in seeing how one file differs from another, especially if they are similar files.
A diff can be displayed in a few different ways, one of which is called a unified diff and is often used when comparing two files or sets of files that have either been edited or have been created from scratch.
A unified diff is simply a single file that displays all the different parts of two or more files. If you were to compare two different versions of a text file, this kind of diff would be useful as it would show which lines were removed, added, changed and/or modified.
How to view a diff on github
It is a good idea to always view the diff of a commit before it is pushed to a repository. This way, the person pushing the commit can see what they are committing and can amend the commit if need be. To view the diff of a commit, click on the commit on the right hand side and then click ‘compare’ in the top right corner, under ‘watch’. This will take you to a page that shows the diff between the chosen commit and its previous state.
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The intent of this project is to create a collection of code that can be used to animate in ClojureScript, using only core.async channels and reducers (i.e., without React). This means there is no DOM manipulation nor use of external CSS frameworks (other than core.css).
The project is just getting started, so most core.async functions are not yet implemented and only a few example applications can be found under the examples directory.
The approach taken here was inspired by the following article: https://www.lunadroid.com/2015/09/28/make-your-own-flipbook-animation-engine.html.
How to create a diff
To create a file diff, go to the directory where the files are that you wish to diff. Run ‘git diff’ and the output will be in the terminal ready to copy and paste into a text document. To diff a set of files, run ‘git diff –cached’ in the same directory as where the files are.
N.B. if the files are in a subdirectory, ‘git diff’ will look at the files in that directory, rather than at the working directory $.git/../.git/.. so make sure you have run git reset –hard first if this is the case.
Note also that in order for a file to be included in a diff it must be present in a commit as well as having content changes since that commit’s SHA.
E.g. if we have a file and it’s last commit was 6e6ddef, and we then add a file called ‘file’ that has no commits, git diff will not show any changes for this file.
An example of a diff that includes a file that’s not present in the working directory /.git/../.git/..:
$ git diff –cached –name-only 6e6ddef file 5ad6f57..6e6ddef [file] 1 now available
The line with the [file] is indicating it is an untracked file. You can ignore this.
What are some common uses for diffs
Diffing is useful for showing how changes were made in two different versions of the same document. It can also show edit changes that were made by replacing one piece of text with another. It is also used to create a patch file to squash diffs from two separate files into one file. This can be useful when trying to maintain a working folder with a large set of files. Finally, it can be used to show changes made to a file that is log compressed, which will reveal the original file before and after such changes were made.
Pre-Requisites [to use as knowledge, not to be copied verbatim]:”git log” : “what are some commands in gitlog?”
Review [to use as knowledge, not to be copied verbatim]:”git log -n > file_diffs.txt” : “what are some useful commands in git log”
Post-Requisites [to use as knowledge, not to be copied verbatim]:”git diff” : “what are some useful commands in git diff”