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/* fmt.c - Text formatter
*
* Copyright 2017 The Android Open Source Project
*
* No standard.
*
* Only counts space and tab for indent level (eats other low ascii chars,
* treats all UTF8 chars as non-whitespace), preserves indentation but squashes
* together runs of whitespace. No header/footer logic, no end-of-sentence
* double-space, preserves initial tab/space mix when indenting new lines.
USE_FMT(NEWTOY(fmt, "w#<0=75", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_LOCALE))
config FMT
bool "fmt"
default n
help
usage: fmt [-w WIDTH] [FILE...]
Reformat input to wordwrap at a given line length, preserving existing
indentation level, writing to stdout.
-w WIDTH maximum characters per line (default 75)
*/
#define FOR_fmt
#include "toys.h"
GLOBALS(
int width;
int level, pos;
)
static void newline(void)
{
if (TT.pos) xputc('\n');
TT.pos = 0;
}
// Process lines of input, with (0,0) flush between files
static void fmt_line(char **pline, long len)
{
char *line;
int idx, indent, count;
// Flush line on EOF
if (!pline) return newline();
// Measure indentation
for (line = *pline, idx = count = 0; isspace(line[idx]); idx++) {
if (line[idx]=='\t') count += 8-(count&7);
else if (line[idx]==' ') count++;
}
indent = idx;
// Blank lines (even with same indentation) flush line
if (idx==len) {
xputc('\n');
TT.level = 0;
return newline();
}
// Did indentation change?
if (count!=TT.level) newline();
TT.level = count;
// Loop through words
while (idx<len) {
char *word = line+idx;
// Measure this word (unicode width) and end
while (idx<len && !isspace(line[idx])) idx++;
line[idx++] = 0;
count = utf8len(word);
if (TT.pos+count>=TT.width) newline();
// When indenting a new line, preserve tab/space mixture of input
if (!TT.pos) {
TT.pos = TT.level-1;
if (indent) printf("%.*s", indent, line);
}
printf(" %s"+!(TT.pos!=TT.level-1), word);
TT.pos += count+1;
while (isspace(line[idx])) idx++;
}
}
void fmt_main(void)
{
loopfiles_lines(toys.optargs, fmt_line);
}
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