fix: change directory of sh interp

docs/api/snail.md

@@ -40,6 +40,11 @@ This function has no parameters.
 A Snail is a shell script interpreter instance.
 
 ### Methods
-#### run(command, streams)
-Runs a shell command. Works the same as `hilbish.run`.
+#### dir(path)
+Changes the directory of the snail instance.
+The interpreter keeps its set directory even when the Hilbish process changes
+directory, so this should be called on the `hilbish.cd` hook.
+
+#### run(command, streams)
+Runs a shell command. Works the same as `hilbish.run`, but only accepts a table of streams.
 

emmyLuaDocs/snail.lua

@@ -2,10 +2,15 @@
 
 local snail = {}
 
+--- Changes the directory of the snail instance.
+--- The interpreter keeps its set directory even when the Hilbish process changes
+--- directory, so this should be called on the `hilbish.cd` hook.
+function snail:dir(path) end
+
 --- Creates a new Snail instance.
 function snail.new() end
 
---- Runs a shell command. Works the same as `hilbish.run`.
+--- Runs a shell command. Works the same as `hilbish.run`, but only accepts a table of streams.
 function snail:run(command, streams) end
 
 return snail

golibs/snail/lua.go

@@ -32,6 +32,7 @@ func loaderFunc(rtm *rt.Runtime) (rt.Value, func()) {
 	snailMethods := rt.NewTable()
 	snailFuncs := map[string]util.LuaExport{
 		"run": {snailrun, 3, false},
+		"dir": {snaildir, 2, false},
 	}
 	util.SetExports(rtm, snailMethods, snailFuncs)
 
@@ -63,7 +64,9 @@ func snailnew(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
 
 // #member
 // run(command, streams)
-// Runs a shell command. Works the same as `hilbish.run`.
+// Runs a shell command. Works the same as `hilbish.run`, but only accepts a table of streams.
+// #param command string
+// #param streams table
 func snailrun(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
 	if err := c.CheckNArgs(2); err != nil {
 		return nil, err
@@ -92,7 +95,7 @@ func snailrun(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
 			}
 		case rt.NilType: // noop
 		default:
-			return nil, errors.New("expected 3rd arg to either be a table or a boolean")
+			return nil, errors.New("expected 3rd arg to be a table")
 	}
 
 	var newline bool
@@ -133,6 +136,31 @@ func snailrun(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
 	return c.PushingNext1(t.Runtime, rt.TableValue(runnerRet)), nil
 }
 
+// #member
+// dir(path)
+// Changes the directory of the snail instance.
+// The interpreter keeps its set directory even when the Hilbish process changes
+// directory, so this should be called on the `hilbish.cd` hook.
+// #param path string Has to be an absolute path.
+func snaildir(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
+	if err := c.CheckNArgs(2); err != nil {
+		return nil, err
+	}
+
+	s, err := snailArg(c, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	dir, err := c.StringArg(1)
+	if err != nil {
+		return nil, err
+	}
+
+	interp.Dir(dir)(s.runner)
+	return c.Next(), nil
+}
+
 func handleStream(v rt.Value, strms *util.Streams, errStream, inStream bool) error {
 	if v == rt.NilValue {
 		return nil

nature/dirs.lua

@@ -79,6 +79,7 @@ function dirs.setOld(d)
 end
 
 bait.catch('hilbish.cd', function(path, oldPath)
+	print(path, oldPath)
 	dirs.setOld(oldPath)
 	dirs.push(path)
 end)

nature/hilbish.lua

@@ -1,9 +1,11 @@
 -- @module hilbish
-local hilbish = require 'hilbish'
+local bait = require 'bait'
 local snail = require 'snail'
 
 hilbish.snail = snail.new()
-
+bait.catch('hilbish.cd', function(path)
+	hilbish.snail:dir(path)
+end)
 --- Runs `cmd` in Hilbish's shell script interpreter.
 --- The `streams` parameter specifies the output and input streams the command should use.
 --- For example, to write command output to a sink.