103 lines
3.7 KiB
Tcl
103 lines
3.7 KiB
Tcl
HELP := "
|
|
wrap: A tool for wrapping lines of text
|
|
|
|
usage: wrap [--help] [files...] [--width=80] [--inplace=no] [--min_split=3] [--no-rewrap] [--hyphen='-']
|
|
--help: Print this message and exit
|
|
[files...]: The files to wrap (stdin is used if no files are provided)
|
|
--width=N: The width to wrap the text
|
|
--inplace: Whether or not to perform the modification in-place or print the output
|
|
--min-split=N: The minimum amount of text on either end of a hyphenation split
|
|
--rewrap|--no-rewrap: Whether to rewrap text that is already wrapped or only split long lines
|
|
--hyphen='-': The text to use for hyphenation
|
|
"
|
|
|
|
UNICODE_HYPHEN := "\{hyphen}"
|
|
|
|
func unwrap(text:Text, preserve_paragraphs=yes, hyphen=UNICODE_HYPHEN -> Text)
|
|
if preserve_paragraphs
|
|
paragraphs := text.split($/{2+ nl}/)
|
|
if paragraphs.length > 1
|
|
return "\n\n".join([unwrap(p, hyphen=hyphen, preserve_paragraphs=no) for p in paragraphs])
|
|
|
|
return text.replace("$(hyphen)\n", "")
|
|
|
|
func wrap(text:Text, width:Int, min_split=3, hyphen="-" -> Text)
|
|
if width <= 0
|
|
fail("Width must be a positive integer, not $width")
|
|
|
|
if 2*min_split - hyphen.length > width
|
|
fail("
|
|
Minimum word split length ($min_split) is too small for the given wrap width ($width)!
|
|
|
|
I can't fit a $(2*min_split - hyphen.length)-wide word on a line without splitting it,
|
|
... and I can't split it without splitting into chunks smaller than $min_split.
|
|
")
|
|
|
|
lines : @[Text]
|
|
line := ""
|
|
for word in text.split($/{whitespace}/)
|
|
letters := word.split()
|
|
skip if letters.length == 0
|
|
|
|
while not _can_fit_word(line, letters, width)
|
|
line_space := width - line.length
|
|
if line != "" then line_space -= 1
|
|
|
|
if min_split > 0 and line_space >= min_split + hyphen.length and letters.length >= 2*min_split
|
|
# Split word with a hyphen:
|
|
split := line_space - hyphen.length
|
|
split = split _max_ min_split
|
|
split = split _min_ (letters.length - min_split)
|
|
if line != "" then line ++= " "
|
|
line ++= ((++: letters.to(split)) or "") ++ hyphen
|
|
letters = letters.from(split + 1)
|
|
else if line == ""
|
|
# Force split word without hyphenation:
|
|
if line != "" then line ++= " "
|
|
line ++= (++: letters.to(line_space)) or ""
|
|
letters = letters.from(line_space + 1)
|
|
else
|
|
pass # Move to next line
|
|
|
|
lines.insert(line)
|
|
line = ""
|
|
|
|
if letters.length > 0
|
|
if line != "" then line ++= " "
|
|
line ++= (++: letters) or ""
|
|
|
|
if line != ""
|
|
lines.insert(line)
|
|
|
|
return "\n".join(lines)
|
|
|
|
func _can_fit_word(line:Text, letters:[Text], width:Int -> Bool; inline)
|
|
if line == ""
|
|
return letters.length <= width
|
|
else
|
|
return line.length + 1 + letters.length <= width
|
|
|
|
func main(files:[Path], width=80, inplace=no, min_split=3, rewrap=yes, hyphen=UNICODE_HYPHEN)
|
|
if files.length == 0
|
|
files = [(/dev/stdin)]
|
|
|
|
for file in files
|
|
text := file.read() or exit("Could not read file: $file")
|
|
|
|
if rewrap
|
|
text = unwrap(text)
|
|
|
|
out := if file.is_file() and inplace
|
|
file
|
|
else
|
|
(/dev/stdout)
|
|
|
|
first := yes
|
|
wrapped_paragraphs : @[Text]
|
|
for paragraph in text.split($/{2+ nl}/)
|
|
wrapped_paragraphs.insert(
|
|
wrap(paragraph, width=width, min_split=min_split, hyphen=hyphen)
|
|
)
|
|
|
|
out.write("\n\n".join(wrapped_paragraphs[]) ++ "\n")
|