82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* line_editing.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: maiboyer <maiboyer@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2024/07/11 18:21:45 by maiboyer #+# #+# */
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/* Updated: 2024/07/30 17:07:59 by rparodi ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "line/_line_functions.h"
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#include "line/_line_internal.h"
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#include "line/_line_structs.h"
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#include "me/printf/printf.h"
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/* =========================== Line editing ================================= */
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/* We define a very simple "append buffer" structure, that is an heap
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* allocated string where we can append to. This is useful in order to
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* write all the escape sequences in a buffer and flush them to the standard
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* output in a single call, to avoid flickering effects. */
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static void _modify_vars(t_usize *a, t_usize *b, bool operation)
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{
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if (!operation)
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{
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*a = 0;
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*b = 0;
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}
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else
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{
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*a += 1;
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*b += 1;
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}
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}
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t_usize line_get_prompt_len(t_const_str s)
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{
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t_usize i;
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t_usize ret;
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if ((_modify_vars(&i, &ret, false), true) && s == NULL)
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return (0);
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while (s[i])
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{
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if (s[i] == '\x1b' && s[++i] == '[')
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{
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i++;
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while ('0' <= s[i] && s[i] <= '?')
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i++;
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while (' ' <= s[i] && s[i] <= '/')
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i++;
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if ('@' <= s[i] && s[i] <= '~')
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i++;
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}
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else
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_modify_vars(&i, &ret, true);
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}
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return (ret);
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}
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/* Single line low level line refresh.
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*
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* Rewrite the currently edited line accordingly to the buffer content,
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* cursor position, and number of columns of the terminal.
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*
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* Flags is REFRESH_* macros. The function can just remove the old
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* prompt, just write it, or both. */
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void line_refresh(t_line_state *state, t_line_flags flags)
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{
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t_string str;
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str = string_new(64);
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string_push(&str, "\r\x1b[2K");
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if (flags & REFRESH_WRITE)
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me_printf_str(&str, "%s%s\x1b[0G\x1b[%uC", state->prompt,
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state->buf.buf, state->pos + line_get_prompt_len(state->prompt));
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me_printf_fd(state->output_fd, "%s", str.buf);
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string_free(str);
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}
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