7 files changed, 70 insertions, 12 deletions
diff --git a/src/user/highway/line.c b/src/user/highway/line.c
index cefdf92..5d1e543 100644
--- a/src/user/highway/line.c
+++ b/src/user/highway/line.c
@@ -17,12 +17,12 @@ static inline uint8_t hex_to_int(char ch) {
 }
 
 void ensure_color() {
-  const struct no_null_sn *fg = get_var((struct no_null_sn){.data = "_color_fg", .length = 9});
-  const struct no_null_sn *bg = get_var((struct no_null_sn){.data = "_color_bg", .length = 9});
-  if (fg && bg)
+  const struct no_null_sn *color = get_var((struct no_null_sn){.data = "_color", .length = 6});
+  //fgbg
+  if (color)
     term_set_color(
-      (hex_to_int(fg->data[0]) << 4) | hex_to_int(fg->data[1]),
-      (hex_to_int(bg->data[0]) << 4) | hex_to_int(bg->data[1])
+      (hex_to_int(color->data[0]) << 4) | hex_to_int(color->data[1]),
+      (hex_to_int(color->data[2]) << 4) | hex_to_int(color->data[3])
     );
 }
 
@@ -100,13 +100,19 @@ void run_line(const char *original_line) {
     term_clear();
     term_paint();
   }
+  else if (blockequ(line, "color", 6)) {
+    new_color();
+    ensure_color();
+    term_paint();
+  }
   else if (blockequ(line, "help", 5)) {
     term_add_sz("Highway is a command shell for Portland OS. It includes variable support and a couple of pseudo-commands. Variables are addressed by surrounding with \"$\". The following list shows each of the pseudo-commands.\n\n"
                 "  source FILE\t"   "run each command in FILE\n"
-                "  clear\t\t\t"     "clear the screen\n"
-                "  echo STRING\t"   "print STRING\n"
                 "  set VAR VALUE\t" "set $VAR$ to VALUE\n"
+                "  color\t\t\t"     "new color scheme\n"
+                "  clear\t\t\t"     "clear the screen\n"
                 "  vars\t\t\t"      "dump variables\n"
+                "  echo STRING\t"   "print STRING\n"
                 "  quit\t\t\t"      "exit highway\n"
                 "  help\t\t\t"      "show this\n");
     term_paint();
diff --git a/src/user/highway/main.c b/src/user/highway/main.c
index c9ceee2..59586c1 100644
--- a/src/user/highway/main.c
+++ b/src/user/highway/main.c
@@ -5,12 +5,10 @@
 
 #include "cmds.h"
 #include "line.h"
+#include "vars.h"
 
 void main(const char *arg) {
-//syslogf("   this task: 0x%2h", this_task);
-//syslogf("  stdio task: 0x%2h", stdio_task);
-//syslogf("calling task: 0x%2h", calling_task);
-
+  new_color();
   source(*arg ? arg : "user/default.rc");
   ensure_color();
 
diff --git a/src/user/highway/vars.c b/src/user/highway/vars.c
index 82062c4..ed9fa3a 100644
--- a/src/user/highway/vars.c
+++ b/src/user/highway/vars.c
@@ -3,6 +3,7 @@
 #include <knob/format.h>
 #include <knob/block.h>
 #include <knob/heap.h>
+#include <knob/rand.h>
 
 #include <pland/pcrt.h>
 
@@ -80,4 +81,24 @@ void dump_vars() {
     term_addf_no_ww("$%ns$\t= %ns\n", node->name.length, node->name.data, node->value.length, node->value.data);
     term_paint();
   }
+}
+
+static const char hex_digits[] = "0123456789abcdef";
+static char color[] = {'1', '0', '.', '.'};
+
+static const struct no_null_sn color_name = {
+  .data = "_color",
+  .length = 6
+};
+
+static const struct no_null_sn color_value = {
+  .data = color,
+  .length = 4
+};
+
+void new_color() {
+  const uint8_t bg = gen_rand() % 0x30 + 0x38;
+  color[2] = hex_digits[bg >> 4];
+  color[3] = hex_digits[bg & 0xf];
+  set_var(color_name, color_value);
 }
 \ No newline at end of file
diff --git a/src/user/highway/vars.h b/src/user/highway/vars.h
index fc4d197..eca58d4 100644
--- a/src/user/highway/vars.h
+++ b/src/user/highway/vars.h
@@ -13,5 +13,6 @@ const struct no_null_sn *get_var(struct no_null_sn name) __attribute__ ((pure));
 void del_var(struct no_null_sn name);
 
 void dump_vars();
+void new_color();
 
 #endif
 \ No newline at end of file
diff --git a/src/user/include/knob/rand.h b/src/user/include/knob/rand.h
new file mode 100644
index 0000000..46052e2
--- /dev/null
+++ b/src/user/include/knob/rand.h
@@ -0,0 +1,8 @@
+#ifndef RAND_H
+#define RAND_H
+
+#include <stdint.h>
+
+uint32_t gen_rand();
+
+#endif
+\ No newline at end of file
diff --git a/src/user/include/pland/syscall.h b/src/user/include/pland/syscall.h
index 6870865..fd0b416 100644
--- a/src/user/include/pland/syscall.h
+++ b/src/user/include/pland/syscall.h
@@ -43,7 +43,8 @@ enum _scn {
   _SCN_WAIT_ANY_IPC_SENT,
   _SCN_FIND_UNREAD_IPC,
   _SCN_WAIT_IPC_READ,
-  _SCN_IS_TASK_RUNNING
+  _SCN_IS_TASK_RUNNING,
+  _SCN_GET_TIMESTAMP
 };
 
 static inline uint32_t _sc0(enum _scn eax) {
@@ -228,4 +229,8 @@ static inline bool _is_task_running(_task_handle_t handle) {
   return (bool)_sc1(_SCN_IS_TASK_RUNNING, handle);
 }
 
+static inline uint32_t _get_timestamp() {
+  return _sc0(_SCN_GET_TIMESTAMP);
+}
+
 #endif
 \ No newline at end of file
diff --git a/src/user/knob/rand.c b/src/user/knob/rand.c
new file mode 100644
index 0000000..63648fb
--- /dev/null
+++ b/src/user/knob/rand.c
@@ -0,0 +1,19 @@
+#include <pland/syscall.h>
+#include <pland/pcrt.h>
+
+#include <stdint.h>
+
+static uint32_t r;
+
+static void seed_rand() {
+  r = _get_timestamp();
+}
+
+BEFORE_MAIN(seed_rand)
+
+uint32_t gen_rand() {
+  r ^= r << 13;
+  r ^= r >> 17;
+  r ^= r << 5;
+  return r;
+}
+\ No newline at end of file