From f67ef17c65aa5acc27c8bb148c2a0c76987c1f00 Mon Sep 17 00:00:00 2001
From: Ákos Kőrösi <korakos99@gmail.com>
Date: Fri, 22 May 2026 01:36:49 +0200
Subject: add more builtins

---
 src/exec.c     | 25 ++++++++++++++++++++++---
 src/lexparse.c |  2 +-
 src/syntax.h   |  2 +-
 3 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/src/exec.c b/src/exec.c
index a65b442..e3ea28f 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -26,9 +26,15 @@ MaybeStrPair parse_assignment(char* token) {
 
 
 bool handle_builtin(ExecutableCommand cmd, ShellState* shstate) {
-
+    MaybeStrPair m_assignment;
     assert(cmd.args[0] != NULL); 
     // TODO: handle id=value assignments
+    
+    m_assignment = parse_assignment(cmd.args[0]);
+    if (m_assignment.some) {
+        set_map_pair(&shstate->shell_vars, m_assignment.value);
+        return true;
+    }
 
     if (strcmp(cmd.args[0], "exit") == 0) {
         exit(0);
@@ -38,16 +44,29 @@ bool handle_builtin(ExecutableCommand cmd, ShellState* shstate) {
         return true;
     } else if (strcmp(cmd.args[0], "alias") == 0) {
         // TODO: if no arg1 -> print alias list
-        MaybeStrPair m_assignment = parse_assignment(cmd.args[1]);
+        m_assignment = parse_assignment(cmd.args[1]);
         assert(m_assignment.some);
         set_map_pair(&shstate->aliases, m_assignment.value); 
         return true;
+    } else if (strcmp(cmd.args[0], "export") == 0) {
+        m_assignment = parse_assignment(cmd.args[1]);
+        assert(m_assignment.some);
+        setenv(m_assignment.value.key, m_assignment.value.val, 1);
+        return true;
+    } else if (strcmp(cmd.args[0], "unalias") == 0) { 
+        assert(cmd.args[1] != NULL);
+        unset_map_key(&shstate->aliases, cmd.args[1]);
+        return true;
+    }  else if (strcmp(cmd.args[0], "unset") == 0) {
+        assert(cmd.args[1] != NULL);
+        unset_map_key(&shstate->shell_vars, cmd.args[1]);
+        return true;
     }
     return false;
 }
 
 void execute_cmd(ExecutableCommand cmd, int* pgid) {
-    
+
     pid_t pid = fork();
 
     if (pid == 0) {
diff --git a/src/lexparse.c b/src/lexparse.c
index e412759..a4105eb 100644
--- a/src/lexparse.c
+++ b/src/lexparse.c
@@ -67,7 +67,7 @@ static MaybeChunk handle_dollar_expansion(char* line, size_t* pos, QuotationMode
 static Chunk collect_un_q_literal(char* line, size_t* pos) {
     String buf = make_String(256);
     size_t i;
-    for (i = *pos; line[i] != '$' && line[i] != '\0' && line[i] == ' '; i++) {
+    for (i = *pos; line[i] != '$' && line[i] != '\0' && line[i] != ' '; i++) {
         push_to_String(&buf, line[i]);
     }
     *pos = i;
diff --git a/src/syntax.h b/src/syntax.h
index 12293ae..cf8ce3f 100644
--- a/src/syntax.h
+++ b/src/syntax.h
@@ -9,7 +9,7 @@ typedef enum {
     PLUS,
     MINUS,
     MULT,
-DIV,
+    DIV,
 } BinOp;
 
 typedef enum {
-- 
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