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input: vim-style paging keys in the help screen (UX-5)

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The NORMAL chat mode has Ctrl+D/U (half page) and Ctrl+F/B (full page)
scrolling, which is what vim users reach for.  The help screen had
none of these — only j/k single-line and g/G top/bottom — so reaching
the bottom of a help dump meant mashing j.

Now the help screen accepts the same four shortcuts.  The page size
is computed from client->height (matching what NORMAL mode does), so
half/full page scroll size scales with the terminal.

Both the EN and ZH help text have been updated to advertise the new
shortcuts.
This commit is contained in:
m1ngsama 2026-05-17 13:49:00 +08:00
parent c66491d4f8
commit ae1bc2f166
2 changed files with 24 additions and 0 deletions
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20
src/input.c
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@ -167,6 +167,12 @@ static bool handle_key(client_t *client, unsigned char key, char *input) {
/* Handle help screen */
if (client->show_help) {
/* Page size: roughly the visible help body region. */
int page = client->height - 2;
if (page < 1) page = 1;
int half = page / 2;
if (half < 1) half = 1;
if (key == 'q' || key == 27) {
client->show_help = false;
tui_render_screen(client);
@ -184,6 +190,20 @@ static bool handle_key(client_t *client, unsigned char key, char *input) {
} else if (key == 'k' && client->help_scroll_pos > 0) {
client->help_scroll_pos--;
tui_render_help(client);
} else if (key == 4) { /* Ctrl+D: half page down */
client->help_scroll_pos += half;
tui_render_help(client);
} else if (key == 21) { /* Ctrl+U: half page up */
client->help_scroll_pos -= half;
if (client->help_scroll_pos < 0) client->help_scroll_pos = 0;
tui_render_help(client);
} else if (key == 6) { /* Ctrl+F: full page down */
client->help_scroll_pos += page;
tui_render_help(client);
} else if (key == 2) { /* Ctrl+B: full page up */
client->help_scroll_pos -= page;
if (client->help_scroll_pos < 0) client->help_scroll_pos = 0;
tui_render_help(client);
} else if (key == 'g') {
client->help_scroll_pos = 0;
tui_render_help(client);

4
src/tui.c
View file

@ -730,6 +730,8 @@ const char* tui_get_help_text(help_lang_t lang) {
"HELP SCREEN KEYS:\n"
" q, ESC - Close help\n"
" j/k - Scroll down/up\n"
" Ctrl+D/U - Scroll half page down/up\n"
" Ctrl+F/B - Scroll full page down/up\n"
" g/G - Jump to top/bottom\n"
" e/z - Switch English/Chinese\n";
} else {
@ -777,6 +779,8 @@ const char* tui_get_help_text(help_lang_t lang) {
"帮助界面按键:\n"
" q, ESC - 关闭帮助\n"
" j/k - 向下/上滚动\n"
" Ctrl+D/U - 向下/上滚动半页\n"
" Ctrl+F/B - 向下/上滚动整页\n"
" g/G - 跳到顶部/底部\n"
" e/z - 切换英文/中文\n";
}