Module host 

The designer host: a child process of the IDE (yog designer-host) that loads a mod’s library built for this machine (yog designer-lib) and draws the mod’s custom .yui components through the same recording YogGfxApi the designer uses — the mod’s own yog-ui and build code, out of the IDE’s process, so a panicking/crashing/looping component (or a rebuilt library) costs a restart of the host, never the IDE.

Protocol: one JSON request per stdin line; one JSON answer per stdout line, prefixed with MARK (the mod’s code may print to stdout too).

• {"cmd":"load","lib":…,"modRoot":…} → {"ok":true,"components":[…]}
• {"cmd":"render","name":…,"props":[[k,v]…],"w":…,"h":…,"availW":…,"availH":…} → {"ok":true,"w":…,"h":…,"ops":[DrawOp…]} (drawn at the origin; w/h ≤ 0: natural size)
• {"cmd":"png", …render…, "scale":4, "out":"x.png"} → the same, also rasterized into out (for checking a component from a shell)

Failures answer {"ok":false,"error":…}.

Structs

ComponentInfo

One component as the mod describes it (describe).

Loaded

A loaded mod library.

PropInfo

RenderReq

Constants

COMMAND

The CLI command that runs a host.

DESIGNER_ABI

The designer protocol version this host speaks (yog_ui::component::designer::ABI).

MARK

Starts every answer line on stdout.

Functions

serve

yog designer-host: serves requests until stdin closes.