Jiří Jakeš

GraphQL with Emacs and Verb mode

Thu, 29 May 2025 00:00:00 +0800

Verb is a capable mode for Emacs and Org mode that allows to define and perform HTTP calls. Besides offering many useful features on its own, it also provides multiple ways how to extends its capabilities. Thanks to them, it can be easily turned into GraphQL client.

Better coloring of search line and tags in notmuch

Tue, 22 Oct 2024 00:00:00 +0800

Notmuch is an email system enjoying an advanced integration with Emacs. It is based on assigning arbitrary number of tags to particular emails. The tags and full-text search can then be used for defining various search queries. Notmuch can handle thousands and thousands of emails thanks to the underlying Xapian database.

When showing search results in Emacs, color of the whole line and particular tags can be configured based on their values. Tags can be colored or their content overridden by notmuch-tag-formats:

BIP 85: Deterministic Entropy From BIP32 Keychains

Thu, 10 Aug 2023 00:00:00 +0800

With the darkest of all words starts BIP 85, warning us about what awaits us:

Ash deės durbatulûk, ash yek gimbatul, ash htâp thrakatulûk, agh burzum-ishi kriptomul.

We the brave, however, will not be stopped by seeds, keys, paths or drngs. And our reward at the end of everything will be sweet: deterministic derivation of entropy from an extended private key. Never again will we have to backup multitude of seeds. One will suffice. Forever.

BIP 39: Mnemonic code for generating deterministic keys

Wed, 26 Jul 2023 00:00:00 +0800

Bitcoin is all about signing stuff and verifying signed stuff. Well, there may be a bit more to it but signing and verifying are quite important. At the beginning of signing and verifying, there is a very large number that no one is supposed to know. The private key. This private key is a key to everything, mainly one’s funds. Human brains, however, are not designed to deal with large numbers, they do better with words and phrases. That is why we were given BIP 39.

BIP 32: Hierarchical Deterministic Wallets

Fri, 30 Jun 2023 00:00:00 +0800

Once upon a time, people using Bitcoin had to generate brand new private key for every new Bitcoin address. And remember all the private keys they generated. It was inconvenient and dangerous. Then in 2012, hierarchical deterministic wallets described in BIP 32 came to save the mankind. Now one has to remember only one value, the seed, and everything else can be calculated from it. This article attempts to bring understanding how BIP 32 functions by implementing it.