113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
#include "toys.h"
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// Show width many columns, negative means from right edge, out=0 just measure
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// if escout, send it unprintable chars, otherwise pass through raw data.
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// Returns width in columns, moves *str to end of data consumed.
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int crunch_str(char **str, int width, FILE *out, char *escmore,
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int (*escout)(FILE *out, int cols, int wc))
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{
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int columns = 0, col, bytes;
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char *start, *end;
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unsigned wc;
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for (end = start = *str; *end; columns += col, end += bytes) {
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if ((bytes = utf8towc(&wc, end, 4))>0 && (col = wcwidth(wc))>=0) {
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if (!escmore || wc>255 || !strchr(escmore, wc)) {
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if (width-columns<col) break;
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if (out) fwrite(end, bytes, 1, out);
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continue;
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}
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}
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if (bytes<1) {
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bytes = 1;
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wc = *end;
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}
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col = width-columns;
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if (col<1) break;
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if (escout) {
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if ((col = escout(out, col, wc))<0) break;
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} else if (out) fwrite(end, 1, bytes, out);
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}
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*str = end;
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return columns;
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}
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// standard escapes: ^X if <32, <XX> if invalid UTF8, U+XXXX if UTF8 !iswprint()
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int crunch_escape(FILE *out, int cols, int wc)
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{
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char buf[11];
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int rc;
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if (wc<' ') rc = sprintf(buf, "^%c", '@'+wc);
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else if (wc<256) rc = sprintf(buf, "<%02X>", wc);
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else rc = sprintf(buf, "U+%04X", wc);
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if (rc > cols) buf[rc = cols] = 0;
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if (out) fputs(buf, out);
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return rc;
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}
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// Display "standard" escapes in reverse video.
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int crunch_rev_escape(FILE *out, int cols, int wc)
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{
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int rc;
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xputsn("\e[7m");
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rc = crunch_escape(out, cols, wc);
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xputsn("\e[27m");
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return rc;
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}
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// Write width chars at start of string to strdout with standard escapes
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// Returns length in columns so caller can pad it out with spaces.
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int draw_str(char *start, int width)
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{
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return crunch_str(&start, width, stdout, 0, crunch_rev_escape);
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}
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// Return utf8 columns
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int utf8len(char *str)
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{
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return crunch_str(&str, INT_MAX, 0, 0, crunch_rev_escape);
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}
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// Return bytes used by (up to) this many columns
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int utf8skip(char *str, int width)
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{
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char *s = str;
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crunch_str(&s, width, 0, 0, crunch_rev_escape);
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return s-str;
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}
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// Print utf8 to stdout with standard escapes, trimmed to width and padded
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// out to padto. If padto<0 left justify. Returns columns printed
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int draw_trim_esc(char *str, int padto, int width, char *escmore,
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int (*escout)(FILE *out, int cols, int wc))
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{
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int apad = abs(padto), len = utf8len(str);
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if (padto>=0 && len>width) str += utf8skip(str, len-width);
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if (len>width) len = width;
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// Left pad if right justified
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if (padto>0 && apad>len) printf("%*s", apad-len, "");
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crunch_str(&str, len, stdout, 0, crunch_rev_escape);
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if (padto<0 && apad>len) printf("%*s", apad-len, "");
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return (apad > len) ? apad : len;
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}
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// draw_trim_esc() with default escape
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int draw_trim(char *str, int padto, int width)
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{
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return draw_trim_esc(str, padto, width, 0, 0);
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}
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