wash
ad8b284869
the line editor supports custom keybinds and data storage, allowing for
a wide range of functionality to be implemented via plugins.
included plugins include:
* core: basic input and cursor movement.
* history: input history storage and retrieval (unfinished)
* highlight: support for colour-highlighting the line buffer (unfinished)
* syntax: parses the line buffer and uses `highlight` to apply syntax highlighting (unfinished).
* shell-integration:
- allows a `prompt` function to be defined, which will be called to get the text to
be used for the prompt
- exposes key properties of the line editor to the shell environment, allowing line editor
functionality to be extended via shell scripts.
106 lines
2.0 KiB
C
106 lines
2.0 KiB
C
#include "line-editor.h"
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#include <fx/encoding.h>
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static void convert_offset_to_xy(
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struct bshell_line_ed_p *ed,
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unsigned long offset,
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unsigned long *out_x,
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unsigned long *out_y)
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{
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unsigned long x = 0, y = 0;
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unsigned int w = 0, h = 0;
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fx_tty_get_dimensions(ed->ed_tty, &w, &h);
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if (!w || !h) {
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w = 80;
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h = 25;
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}
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fx_string *prompt = line_ed_get_prompt(ed);
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fx_string *buffer = line_ed_get_buffer(ed);
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const char *s = fx_string_get_cstr(prompt);
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size_t len = fx_string_get_size(prompt, FX_STRLEN_CODEPOINTS);
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fx_wchar prev = FX_WCHAR_INVALID;
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for (unsigned long i = 0; i < len; i++) {
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fx_wchar c = fx_wchar_utf8_codepoint_decode(s);
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if (prev != FX_WCHAR_INVALID) {
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if (prev == '\n' || x + 1 >= w) {
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x = 0;
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y++;
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} else {
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x += line_ed_get_char_width(c);
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}
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}
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unsigned int stride = fx_wchar_utf8_codepoint_size(c);
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if (stride == 0) {
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break;
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}
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s += stride;
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prev = c;
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}
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s = fx_string_get_cstr(buffer);
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len = fx_string_get_size(buffer, FX_STRLEN_CODEPOINTS);
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for (unsigned long i = 0; i < offset && i < len; i++) {
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fx_wchar c = fx_wchar_utf8_codepoint_decode(s);
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if (prev != FX_WCHAR_INVALID) {
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if (prev == '\n' || x + 1 >= w) {
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x = 0;
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y++;
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} else {
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x += line_ed_get_char_width(c);
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}
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}
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unsigned int stride = fx_wchar_utf8_codepoint_size(c);
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if (stride == 0) {
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break;
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}
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s += stride;
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prev = c;
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}
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if (offset > len) {
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if (x + 1 >= w) {
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x = 0;
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y++;
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} else {
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x++;
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}
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}
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if (out_x) {
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*out_x = x;
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}
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if (out_y) {
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*out_y = y;
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}
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}
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void line_ed_get_points(struct bshell_line_ed_p *ed, struct cursor_points *out)
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{
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unsigned long cursor = line_ed_get_cursor(ed);
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fx_string *buffer = line_ed_get_buffer(ed);
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convert_offset_to_xy(
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ed,
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cursor + 1,
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&out->c_cursor_x,
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&out->c_cursor_y);
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convert_offset_to_xy(
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ed,
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fx_string_get_size(buffer, FX_STRLEN_CODEPOINTS),
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&out->c_render_limit_x,
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&out->c_render_limit_y);
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convert_offset_to_xy(
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ed,
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fx_string_get_size(buffer, FX_STRLEN_CODEPOINTS) + 1,
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&out->c_cursor_limit_x,
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&out->c_cursor_limit_y);
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}
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