xonsh: fix subprocess handling

cmd/carapace/cmd/lazyinit/xonsh.go

@@ -5,26 +5,48 @@ import (
 	"strings"
 )
 
+// Xonsh creates a generic completer (not lazy).
+// Name overlaps with specific `carapace` completer but that shouldn't be an issue.
 func Xonsh(completers []string) string {
-	snippet := `from xonsh.completers._aliases import _add_one_completer
-from xonsh.completers.tools import *
+	snippet := `from xonsh.completers.completer import add_one_completer
+from xonsh.completers.tools import contextual_command_completer, sub_proc_get_output, RichCompletion
+import json
 import os
 
 %v%v
 
-@contextual_completer
-def _carapace_lazy(context):
-    """carapace lazy"""
-    if (context.command and
-        context.command.arg_index > 0 and
-        context.command.args[0].value in [%v]):
-        exec(compile(subprocess.run(['carapace', context.command.args[0].value, 'xonsh'], stdout=subprocess.PIPE).stdout.decode('utf-8'), "", "exec"))
-        return XSH.completers[context.command.args[0].value](context)
+@contextual_command_completer
+def _carapace_completer(context):
+    """carapace completer"""
+
+    if context.command not in [%v]:
+        return
+
+    def fix_prefix(s):
+        """quick fix for partially quoted prefix completion ('prefix',<TAB>)"""
+        return s.translate(str.maketrans('', '', '\'"'))
+
+    output, _ = sub_proc_get_output(
+        'carapace', context.command, 'xonsh', *[a.value for a in context.args], fix_prefix(context.prefix)
+    )
+    if not output:
+        return
+
+    for c in json.loads(output):
+        yield RichCompletion(
+            c["Value"],
+            display=c["Display"],
+            description=c["Description"],
+            prefix_len=len(context.raw_prefix),
+            append_closing_quote=False,
+            style=c["Style"],
+        )
+
+add_one_completer('carapace', _carapace_completer, 'start')
 `
 	complete := make([]string, len(completers))
 	for index, completer := range completers {
 		complete[index] = fmt.Sprintf(`'%v'`, completer)
 	}
-	snippet += `_add_one_completer('carapace_lazy', _carapace_lazy, 'start')`
 	return fmt.Sprintf(snippet, pathSnippet("xonsh"), envSnippet("xonsh"), strings.Join(complete, ", "))
 }