Add Make Direnv Less Noisy as a Unix TIL

unix/make-direnv-less-noisy.md

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+# Make Direnv Less Noisy
+
+I've been using [`direnv`](https://direnv.net/) to manage project and folder
+specific environment variables for a bit now. I've found it to be pretty
+seamless. It can feel like it is littering my shell with too much output when I
+change directories though.
+
+There are two levers to control its output.
+
+First, the direnv logs (e.g. `direnv: loading ~/.../.envrc`) can be controlled
+with the `DIRENV_LOG_FORMAT` env var. Add this to the
+`~/.config/direnv/direnvrc` file (add that directory and file if necessary).
+You can leave it blank to altogether hide log messages or you can gray-out the
+log messages like this:
+
+```
+export DIRENV_LOG_FORMAT=$'\033[2mdirenv: %s\033[0m'
+```
+
+Second, you can hide the env var diff with a separate config. This diff is not
+covered under the umbrella of logs controlled by the above setting. Set
+[`hide_env_diff` in the `~/.config/direnv/direnv.toml`
+file](https://direnv.net/man/direnv.toml.1.html#codehideenvdiffcode):
+
+```toml
+[global]
+hide_env_diff = true
+```
+
+This second config was only added as of `v2.34.0`.
+
+[source](https://esham.io/2023/10/direnv)