1 files changed, 70 insertions, 1 deletions

diff --git a/syntax.h b/syntax.h
index b395705..8404d15 100644
--- a/syntax.h
+++ b/syntax.h
@@ -3,11 +3,13 @@
 #include "utils.h"
 
 
+// Stage 1
+
 typedef enum {
     PLUS,
     MINUS,
     MULT,
-    DIV,
+DIV,
 } BinOp;
 
 typedef enum {
@@ -20,6 +22,7 @@ struct ArithmNode {
     ArithmNodeKind kind;
     union {
         int lit_val;
+        IntVec open_fds;
         struct {
             BinOp op;
             ArithmNode* left;
@@ -96,3 +99,69 @@ typedef struct {
     TokenVec token_pool;
     TokenPtrVec top_tokens;
 } Ast;
+
+
+
+// Stage 2
+
+
+typedef enum {
+    REDIR_FILE_IN,
+    REDIR_FILE_OUT,
+    REDIR_FDS,
+} RedirectKind;
+
+typedef struct {
+    RedirectKind kind;
+    union {
+        char* filename;
+        struct{int from; int to;} fds; 
+    } as;
+} Redirect;
+
+DECLARE_VEC(Redirect, RedirectVec)
+
+typedef struct {
+    char** args;
+    RedirectVec redirects;
+} SimpleCommand;
+
+DECLARE_VEC(SimpleCommand, SimpleCommandVec)
+DECLARE_VEC(SimpleCommand*, SimpleCommandPtrVec)
+
+
+typedef enum {
+    CONN_PIPE,
+    CONN_EOL,
+} Connector;
+
+typedef struct {
+    SimpleCommand* cmd;
+    SimpleCommandPtrVec deps;
+    Connector conn;
+} PlCommand;
+
+DECLARE_VEC(PlCommand, PlCommandVec)
+
+typedef struct {
+    SimpleCommandVec commands;
+    PlCommandVec pipeline;
+} ExecTree;
+
+
+
+// Stage 3
+
+typedef struct {
+    int redirected;
+    int to;
+} FdRedirect;
+
+DECLARE_VEC(FdRedirect, FdRedirectVec)
+
+typedef struct {
+    char** args;
+    FdRedirectVec redirects;
+    int stdin_fd, stdout_fd;
+    IntVec open_fds;
+} ExecutableCommand;