From 6d50d5b97d49a74a8faf587ec2bbf234626adf0c Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Tue, 19 Oct 2021 14:16:54 -0700
Subject: Feat(rc): added subshell commands and cd builtin

Slowly chipping away at a decent feature list.
Subshell commands are executed by @{ ... }.
---
 sys/cmd/rc/syntax.y | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'sys/cmd/rc/syntax.y')

diff --git a/sys/cmd/rc/syntax.y b/sys/cmd/rc/syntax.y
index 469260f..6334819 100644
--- a/sys/cmd/rc/syntax.y
+++ b/sys/cmd/rc/syntax.y
@@ -1,4 +1,4 @@
-%token Tword Twords Tif Telse Tbang
+%token Tword Twords Tif Telse Tbang Tsubshell
 %token Targs Tindex
 %token Tbasic Tparen Tblock
 
@@ -14,7 +14,7 @@
 /* operator precendence: lowest first */
 %left  Twhile Telse
 %left  '\n'
-%left  Tbang
+%left  Tbang Tsubshell
 %right '$' Tcount Tflat
 %right Tindex
 
@@ -24,7 +24,7 @@
 }
 %type<tree> line cmds cmdsln body paren block ifbody assign;
 %type<tree> cmd basic executable nonkeyword keyword word words wordsnl atom arg args;
-%type<tree> Tbang;
+%type<tree> Tbang Tsubshell Tindex;
 %type<tree> Tword Tif Telse;
 
 /* grammar */
@@ -71,6 +71,8 @@ cmd:
 | block
 | assign cmd %prec Tbang  { $$ = hangchild1($1, $2, 2); }
 | Tif paren nl ifbody     { $$ = hangchild1($2, $1, 0); }
+| Tbang cmd               { $$ = maketree1(Tbang, $2); }
+| Tsubshell cmd           { $$ = maketree1(Tsubshell, $2); }
 
 basic:
   executable
@@ -103,7 +105,7 @@ nonkeyword:
 //| '`'  block      { $$ = maketree1('`', $2); }
 
 keyword:
-    Tif|Telse
+    Tif|Telse|Tbang|Tsubshell
 
 words:
 /* empty */  { $$ = nil; }
-- 
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