Emacs

Sometimes, I need to revert a series of commits that I've already pushed, doing a git hard reset (git reset --hard) is not an option, as someone may already have new commits based on mine.

For example, assume that I've made a few commits like below:

65a2c62 * commit 10
25cad43 * commit 9
72ad583 * commit 8
ceebf9a * commit 7
acf8a11 * commit 6
28d526f * commit 5
63af1e2 * commit 4
982c71c * commit 3
0fb4c2d * commit 2
acf9da1 * commit 1
b5f9933 * commit 0

For whatever reason, I need to "drop" the changes made by commit 6 to commit 10, that is, go back to "commit 5" without deleting these commits.

Recently I found some great articles on wikiHow, then I want to keep notes of them in org-mode files.

At first, I manually copied the ToC of articles, but soon I found it's tedious and takes a lot of time. Today I wrote a requests-based Python script to help me extract the ToCs (Table of Content) into org-mode outlines. It takes two arguments, the first one is the URL, the second one is the containing heading's level for the generated ToC in org-mode.

Emacs' M-x align-regex is neat when I want to align some similar text, especially when we're coding. I use its trivial version(without prefix arg) regularly on day-to-day programming work before.

For example, I can use it to align below code quickly by:

1. Choose the region
2. M-x align-regexp and type = and Enter

aaaaaaaaaaaaaa = fields[0]
bbb = fields[1]
cccccccc = fields[2]

It will be aligned to below code, now it's better to read:

aaaaaaaaaaaaaa = fields[0]
bbb            = fields[1]
cccccccc       = fields[2]

A few days ago, I found myself don't understand how it works when I read the code of smart-align, A simple align-regexp wrapper for easier usage. I was confused by the parameters, especially REGEXP and GROUP, and SPACING, here is its signature:

Yasnippet is a good friend to help us type less and write more, whenever we write some text snippets repeatedly. And there is also an official repository called yasnippet-snippets that contains various snippets for many programming languages (modes), so that we can have many snippets in no time by installing it.

But there is a little problem when it comes to conforming to different coding styles.

Take the if snippet for example, normally it will generate code like this: