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Enable reflow when supported #688

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Enable reflow when supported #688

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5 changes: 5 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,11 @@ if (USE_SYSTEM_LIBVTERM)
if (${VTermSBClearExists} EQUAL "0")
add_definitions(-DVTermSBClearNotExists)
endif()
execute_process(COMMAND grep -c "vterm_screen_enable_reflow" "${LIBVTERM_INCLUDE_DIR}/vterm.h" OUTPUT_VARIABLE VTermEnableReflowExists)
if (${VTermEnableReflowExists} EQUAL "0")
message(WARNING "System libvterm too old, reflow not supported")
add_definitions(-DVTermEnableReflowNotExists)
endif()
else()
message(STATUS "System libvterm not found: libvterm will be downloaded and compiled as part of the build process")
endif()
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7 changes: 6 additions & 1 deletion vterm-module.c
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Expand Up @@ -69,7 +69,9 @@ static int term_sb_push(int cols, const VTermScreenCell *cells, void *data) {
sbrow->info = term->lines[0];
memmove(term->lines, term->lines + 1,
sizeof(term->lines[0]) * (term->lines_len - 1));
if (term->resizing) {
if (term->resizing &&
term->height_resize < 0 &&
term->lines_len + term->height_resize > term->height) {
/* pushed by window height decr */
if (term->lines[term->lines_len - 1] != NULL) {
/* do not need free here ,it is reused ,we just need set null */
Expand Down Expand Up @@ -1242,6 +1244,9 @@ emacs_value Fvterm_new(emacs_env *env, ptrdiff_t nargs, emacs_value args[],
vterm_screen_set_callbacks(term->vts, &vterm_screen_callbacks, term);
vterm_screen_set_damage_merge(term->vts, VTERM_DAMAGE_SCROLL);
vterm_screen_enable_altscreen(term->vts, true);
#ifndef VTermEnableReflowNotExists
vterm_screen_enable_reflow(term->vts, true);
#endif
term->sb_size = MIN(SB_MAX, sb_size);
term->sb_current = 0;
term->sb_pending = 0;
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