From 47513bd32c256c4f35e3a8ced7d9fd7e15903530 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji6283@gmail.com>
Date: Tue, 16 Feb 2021 20:38:53 -0500
Subject: terminal application with ipc, shift+pause state dumper, hello world
 for terminal, meminfo popup program

---
 src/user/libterm/readline.c | 106 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/user/libterm/readline.c

(limited to 'src/user/libterm/readline.c')

diff --git a/src/user/libterm/readline.c b/src/user/libterm/readline.c
new file mode 100644
index 0000000..b37801d
--- /dev/null
+++ b/src/user/libterm/readline.c
@@ -0,0 +1,106 @@
+#include <libterm/terminal.h>
+
+#include <knob/block.h>
+#include <knob/key.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) {
+  term_add_sz(prompt);
+  term_add_char(' ');
+  term_paint();
+
+  uint32_t l = 0;
+  uint32_t c = 0;
+
+  while (1) {
+    struct key_packet kp = term_get_key_blocking();
+    switch (kp.key_id) {
+    case KEY_LEFT_ARROW:
+      if (c) {
+        --c;
+        term_cursor_left();
+        term_paint();
+      }
+      continue;
+    case KEY_RIGHT_ARROW:
+      if (c != l) {
+        ++c;
+        term_cursor_right();
+        term_paint();
+      }
+      continue;
+    case KEY_HOME:
+      while (c) {
+        --c;
+        term_cursor_left();
+      }
+      term_paint();
+      continue;
+    case KEY_END:
+      while (c != l) {
+        ++c;
+        term_cursor_right();
+      }
+      term_paint();
+      continue;
+    case KEY_DELETE:
+      if (c != l) {
+        ++c;
+        term_cursor_right();
+      }
+    case KEY_BSPACE:
+      if (!c)
+        continue;
+      --c;
+      --l;
+      for (uint32_t i = c; i < l; ++i)
+        sz[i] = sz[i + 1];
+      term_cursor_left();
+      term_add_sn_no_ww(sz + c, l - c);
+      term_add_char(' ');
+      for (uint32_t i = l + 1; i > c; --i)
+        term_cursor_left();
+      term_paint();
+      continue;
+    case KEY_ENTER:
+      while (c != l) {
+        ++c;
+        term_cursor_right();
+      }
+      sz[l] = '\0';
+      term_add_char('\n');
+      term_paint();
+      return l;
+    default:
+      if (l == max_length)
+        continue;
+      char ch = key_to_char(kp);
+      if (!ch)
+        continue;
+      if (c == l) {
+        ++l;
+        term_add_char(sz[c++] = ch);
+        term_paint();
+        continue;
+      }
+      if (!(kp.modifiers & INSERT)) {
+        term_add_char(sz[c++] = ch);
+        term_paint();
+        continue;
+      }
+      for (uint32_t i = l; i > c; --i)
+        sz[i] = sz[i - 1];
+      sz[c] = ch;
+      ++l;
+      term_add_sn_no_ww(sz + c, l - c);
+      ++c;
+      for (uint32_t i = l; i > c; --i)
+        term_cursor_left();
+      term_paint();
+      continue;
+    }
+  }
+}
\ No newline at end of file
-- 
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