1 files changed, 104 insertions, 0 deletions
diff --git a/src/user/terminal/readline.c b/src/user/terminal/readline.c
new file mode 100644
index 0000000..37ef54b
--- /dev/null
+++ b/src/user/terminal/readline.c
@@ -0,0 +1,104 @@
+#include <terminal/terminal.h>
+
+#include <knob/format.h>
+#include <knob/heap.h>
+#include <knob/key.h>
+
+#include <pland/syscall.h>
+
+#include <stdint.h>
+
+//returns length of string without null terminator
+//max_length doesn't include null terminator
+uint32_t read_line(char *sz, uint32_t max_length, const char *prompt) {
+  uint32_t i = 0;
+  uint32_t l = 0;
+
+  term_add_sz_no_ww(prompt);
+  paint_term();
+
+  const _window_handle_t handle = active_term->window;
+  struct window_action action;
+  while (1) {
+    _get_win_action(handle, &action);
+    switch (action.action_type) {
+    case NOT_READY:
+      _wait_for_action();
+      _yield_task();
+      continue;
+    case KEY_DOWN:
+   //;char *const debug_msg = format("got key 0x%2x, 0x%3x", action.as_key.key_id, action.as_key.modifiers);
+   // _system_log(debug_msg);
+   // free_block(debug_msg);
+      switch (action.as_key.key_id) {
+      case KEY_DELETE:
+        if (i != l) {
+          cursor_right();
+          ++i;
+        }
+      case KEY_BSPACE:
+        if (!i)
+          continue;
+        --l;
+        --i;
+        for (uint8_t j = i; j < l; ++j)
+          sz[j] = sz[j + 1];
+        sz[l] = '\0';
+        cursor_left();
+        uint32_t cursor_backup_x = active_term->cursor_x;
+        uint32_t cursor_backup_y = active_term->cursor_y;
+        term_add_sz_no_ww(sz + i);
+        term_add_char(' ');
+        move_cursor(cursor_backup_y, cursor_backup_x);
+        paint_term();
+        continue;
+      case KEY_ENTER:
+        term_newline();
+        paint_term();
+        sz[l] = '\0';
+        return l;
+      case KEY_HOME:
+      case KEY_UP_ARROW:
+        for (; i; --i)
+          cursor_left();
+        paint_term();
+        continue;
+      case KEY_END:
+      case KEY_DOWN_ARROW:
+        for (; i != l; ++i)
+          cursor_right();
+        paint_term();
+        continue;
+      case KEY_LEFT_ARROW:
+        if (i) {
+          cursor_left();
+          paint_term();
+          --i;
+        }
+        continue;
+      case KEY_RIGHT_ARROW:
+        if (i != l) {
+          cursor_right();
+          paint_term();
+          ++i;
+        }
+        continue;
+      default:
+        if (i == max_length)
+          continue;
+        char ch = key_to_char(action.as_key);
+        if (ch) {
+          term_add_char(ch);
+          paint_term();
+          sz[i] = ch;
+          if (i == l)
+            ++l;
+          ++i;
+        }
+        continue;
+      }
+    default:
+      continue;
+    }
+  }
+}
+\ No newline at end of file