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less: experimental code to enable wrap/no-wrap
and adapting to resized xterm windows. disabled for now.
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8f39b72aba
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137
miscutils/less.c
137
miscutils/less.c
@ -28,6 +28,9 @@
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#include "xregex.h"
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#endif
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/* In progress */
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#define ENABLE_FEATURE_LESS_REWRAP 0
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/* FIXME: currently doesn't work right */
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#undef ENABLE_FEATURE_LESS_FLAGCS
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#define ENABLE_FEATURE_LESS_FLAGCS 0
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@ -81,6 +84,7 @@ enum {
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FLAG_TILDE = 1 << 4,
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FLAG_I = 1 << 5,
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/* hijack command line options variable for internal state vars */
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LESS_STATE_NO_WRAP = 1 << 14,
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LESS_STATE_MATCH_BACKWARDS = 1 << 15,
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};
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@ -214,6 +218,88 @@ static void less_exit(int code)
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exit(code);
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}
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#if ENABLE_FEATURE_LESS_REWRAP
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static void re_wrap(void)
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{
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int w = width;
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int rem;
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int src_idx;
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int dst_idx;
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int new_cur_fline = 0;
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uint32_t lineno;
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char linebuf[w + 1];
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const char **old_flines = flines;
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const char *s;
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char **new_flines = NULL;
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char *d;
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if (option_mask32 & FLAG_N)
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w -= 8;
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src_idx = 0;
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dst_idx = 0;
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s = old_flines[0];
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lineno = LINENO(s);
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d = linebuf;
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rem = w;
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while (1) {
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*d = *s;
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if (*d != '\0') {
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s++;
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d++;
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rem--;
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if (rem == 0) {
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int sz;
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/* new line is full, create next one */
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*d = '\0';
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next_new:
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sz = (d - linebuf) + 1; /* + 1: NUL */
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d = ((char*)xmalloc(sz + 4)) + 4;
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LINENO(d) = lineno;
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memcpy(d, linebuf, sz);
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new_flines = xrealloc_vector(new_flines, 8, dst_idx);
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new_flines[dst_idx] = d;
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dst_idx++;
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if (rem) {
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/* did we come here thru "goto next_new"? */
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if (src_idx > max_fline)
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break;
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lineno = LINENO(s);
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}
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d = linebuf;
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rem = w;
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}
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continue;
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}
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/* *d == NUL: old line ended, go to next old one */
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free(MEMPTR(old_flines[src_idx]));
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/* btw, convert cur_fline... */
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if (cur_fline == src_idx) {
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new_cur_fline = dst_idx;
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}
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src_idx++;
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/* no more lines? finish last new line (and exit the loop) */
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if (src_idx > max_fline) {
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goto next_new;
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}
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s = old_flines[src_idx];
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if (lineno != LINENO(s)) {
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/* this is not a continuation line!
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* create next _new_ line too */
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goto next_new;
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}
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}
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free(old_flines);
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flines = (const char **)new_flines;
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max_fline = dst_idx - 1;
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linepos = 0; // XXX
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cur_fline = new_cur_fline;
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/* max_lineno is screen-size independent */
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}
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#endif
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#if ENABLE_FEATURE_LESS_REGEXP
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static void fill_match_lines(unsigned pos);
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#else
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@ -502,7 +588,7 @@ static void lineno_str(char *nbuf9, const char *line)
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}
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/* Width of 7 preserves tab spacing in the text */
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fmt = "%7u ";
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n = LINENO(line);
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n = LINENO(line) + 1;
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if (n > 9999999) {
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n %= 10000000;
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fmt = "%07u ";
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@ -633,6 +719,35 @@ static void buffer_print(void)
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status_print();
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}
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#if ENABLE_FEATURE_LESS_REWRAP
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static void buffer_fill_and_print(void)
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{
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unsigned i = 0;
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int fpos = cur_fline + i;
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if (option_mask32 & LESS_STATE_NO_WRAP) {
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/* Go back to the beginning of this line */
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while (fpos && LINENO(flines[fpos]) == LINENO(flines[fpos-1]))
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fpos--;
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}
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while (i <= max_displayed_line && fpos <= max_fline) {
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int lineno = LINENO(flines[fpos]);
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buffer[i] = flines[fpos];
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i++;
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do {
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fpos++;
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} while ((fpos <= max_fline)
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&& (option_mask32 & LESS_STATE_NO_WRAP)
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&& lineno == LINENO(flines[fpos])
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);
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}
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for (; i <= max_displayed_line; i++) {
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buffer[i] = empty_line_marker;
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}
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buffer_print();
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}
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#else
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static void buffer_fill_and_print(void)
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{
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unsigned i;
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@ -644,6 +759,7 @@ static void buffer_fill_and_print(void)
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}
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buffer_print();
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}
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#endif
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/* Move the buffer up and down in the file in order to scroll */
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static void buffer_down(int nlines)
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@ -1371,6 +1487,25 @@ static void keypress_process(int keypress)
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case ':':
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colon_process();
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break;
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#if ENABLE_FEATURE_LESS_REWRAP
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case '*':
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option_mask32 ^= FLAG_N;
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get_terminal_width_height(kbd_fd, &width, &max_displayed_line);
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if (width < 20) /* 20: two tabstops + 4 */
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width = 20;
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if (max_displayed_line < 3)
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max_displayed_line = 3;
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max_displayed_line -= 2;
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free(buffer);
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buffer = xmalloc((max_displayed_line+1) * sizeof(char *));
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re_wrap();
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buffer_fill_and_print();
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break;
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case '&':
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option_mask32 ^= LESS_STATE_NO_WRAP;
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buffer_fill_and_print();
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break;
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#endif
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}
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if (isdigit(keypress))
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