In a previous discussion about Vim-style digraphs:
vxid posted a link to a C program that can be used to convert text digraphs through a pipe. Aside from this link, there has been little progress on interactive digraphs for Kakoune.
Here is a plugin that tries to address this issue:
The plugin provides vim-like digraphs, but with improvements:
81 new symbols (including currency symbols and useful math/tech symbols such as Planck’s constant) are included, which brings the total of available symbols to 1305
digraphs can be searched in Insert mode by digraph, unicode description, or hex value, and results are displayed along with their digraph and unicode point
digraph conversion in Insert mode has the possibility of reinserting the last inserted symbol, of appending a postfix after the insertion, and of converting the last-typed word instead of the last-typed character pair
digcommand, available in Normal mode, sweeps over the selection and converts each digraph in it to the corresponding symbol.
The README on GitHub gives more details and has a few examples of converted text.