1 files changed, 91 insertions, 0 deletions
diff --git a/examples/dte/screen-cmdline.c b/examples/dte/screen-cmdline.c
new file mode 100644
index 0000000..58d04c4
--- /dev/null
+++ b/examples/dte/screen-cmdline.c
@@ -0,0 +1,91 @@
+#include "screen.h"
+#include "error.h"
+#include "search.h"
+
+static void print_message(Terminal *term, const ColorScheme *colors, const char *msg, bool is_error)
+{
+    BuiltinColorEnum c = BC_COMMANDLINE;
+    if (msg[0]) {
+        c = is_error ? BC_ERRORMSG : BC_INFOMSG;
+    }
+
+    TermOutputBuffer *obuf = &term->obuf;
+    set_builtin_color(term, colors, c);
+
+    for (size_t i = 0; msg[i]; ) {
+        CodePoint u = u_get_char(msg, i + 4, &i);
+        if (!term_put_char(obuf, u)) {
+            break;
+        }
+    }
+}
+
+void show_message(Terminal *term, const ColorScheme *colors, const char *msg, bool is_error)
+{
+    term_output_reset(term, 0, term->width, 0);
+    term_move_cursor(&term->obuf, 0, term->height - 1);
+    print_message(term, colors, msg, is_error);
+    term_clear_eol(term);
+}
+
+static size_t print_command(Terminal *term, const ColorScheme *colors, const CommandLine *cmdline, char prefix)
+{
+    const String *buf = &cmdline->buf;
+    TermOutputBuffer *obuf = &term->obuf;
+
+    // Width of characters up to and including cursor position
+    size_t w = 1; // ":" (prefix)
+
+    for (size_t i = 0; i <= cmdline->pos && i < buf->len; ) {
+        CodePoint u = u_get_char(buf->buffer, buf->len, &i);
+        w += u_char_width(u);
+    }
+    if (cmdline->pos == buf->len) {
+        w++;
+    }
+    if (w > term->width) {
+        obuf->scroll_x = w - term->width;
+    }
+
+    set_builtin_color(term, colors, BC_COMMANDLINE);
+    term_put_char(obuf, prefix);
+
+    size_t x = obuf->x - obuf->scroll_x;
+    for (size_t i = 0; i < buf->len; ) {
+        BUG_ON(obuf->x > obuf->scroll_x + obuf->width);
+        CodePoint u = u_get_char(buf->buffer, buf->len, &i);
+        if (!term_put_char(obuf, u)) {
+            break;
+        }
+        if (i <= cmdline->pos) {
+            x = obuf->x - obuf->scroll_x;
+        }
+    }
+
+    return x;
+}
+
+void update_command_line(EditorState *e)
+{
+    Terminal *term = &e->terminal;
+    char prefix = ':';
+    term_output_reset(term, 0, term->width, 0);
+    term_move_cursor(&term->obuf, 0, term->height - 1);
+    switch (e->input_mode) {
+    case INPUT_NORMAL: {
+        bool msg_is_error;
+        const char *msg = get_msg(&msg_is_error);
+        print_message(term, &e->colors, msg, msg_is_error);
+        break;
+    }
+    case INPUT_SEARCH:
+        prefix = e->search.reverse ? '?' : '/';
+        // Fallthrough
+    case INPUT_COMMAND:
+        e->cmdline_x = print_command(term, &e->colors, &e->cmdline, prefix);
+        break;
+    default:
+        BUG("unhandled input mode");
+    }
+    term_clear_eol(term);
+}