Environment variables

Variable
HEED_SESSION_ID The session the pane belongs to
HEED_SOCKET The socket to report to
HEED_PANE_ID The pane
HEED_BIN The bundled heed helper
PATH The PATH Heed found (see Finding git and gh), with the helper first
Variable
XDG_CONFIG_HOME Where heed/config.toml lives, if set
HEED_FIXTURE Open on made-up data, with no IO: main, empty, resume, firstrun
HEED_SNAPSHOT Render the window to this PNG and quit (HEED_SNAPSHOT_KEYS, _SIZE, _DELAY, _SETTLE)
HEED_SHOTS Render every docs screenshot into this folder and quit (HEED_SHOTS_ONLY, HEED_DOCS)

The last three are for working on Heed itself: mise run shots uses HEED_SHOTS to regenerate every image in these docs from the fake world.