koyu doors
Gives the route from one space to another through the fewest doors on the space graph. It is the escape-and-circulation question.
Arguments
koyu doors <entry.muro> <pathA> <pathB>After the entry path, give the departure and arrival space paths. Both are required.
Flags
None.
Output
One line: the number of doors, and the spaces passed through.
npx tsx src/cli.ts doors examples/two-rooms.muro /L1/a /out
2 doors — /L1/a → /L1/b → /outThe route is a list of spaces, not of doors. Boundaries that cost no door — open, stairs — also appear along it.
npx tsx src/cli.ts doors examples/house/main.muro /home/bed1 /out/road
3 doors — /home/bed1 → /home/hall2 → /home/hall1 → /site/east → /site/garden → /out/roadFive boundaries are crossed but only 3 doors counted. /home/hall2 → /home/hall1 is a stair and /site/east → /site/garden is open, so neither counts.
When there is no route, it says so.
npx tsx src/cli.ts doors examples/house/main.muro /home/bed9 /site/garden
Cannot reach /site/garden from /home/bed9What is passable
| Boundary | Passable |
|---|---|
| A wall with doors | Yes (the doors are counted) |
| A wall with no doors | No |
open | Yes (no door counted) |
A wall with air:1 (railings, fences, garden walls) | No — air is about enclosure, not about passage |
stair | Yes (no door counted) |
shaft (lifts and the like) | No |
void | No |
Boundaries you never wrote are used too. The default between touching spaces is a wall, and a wall with no doors is impassable, so a contact you did not write acts to block the route.
Paths that do not exist
A mistyped path also produces "cannot reach". A typo and a genuine dead end give the same message and the same exit code 1. The /home/bed9 above is not a space that exists.
When you get "cannot reach", check the spelling with koyu graph first. The exterior is not necessarily one space — in examples/house it is split into /out/road, /out/n, /out/e and /out/w, and there is no space called /out.
Exit codes
| Exit code | Meaning |
|---|---|
| 0 | It can be reached |
| 1 | It cannot be reached (including via a path that does not exist), or the input could not be read |
| 2 | Two paths were not given / no file path was given |
npx tsx src/cli.ts doors examples/house/main.muro /home/bed1
Usage: koyu doors <file> /pathA /pathBOne pair at a time
doors answers about the one pair you gave it. To ask whether any room at all fails to reach the outside, use koyu validate — access.unreachable tests reachability to the exterior for every room that has a region.
See also
- koyu graph — adjacency and boundary kinds, space by space
- koyu validate — reachability across the whole building at once
- .muro reference — how to write
boundaryand openings - The koyu command — the shared promises about exit codes