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Diffstat (limited to 'man/grab.1')
| -rw-r--r-- | man/grab.1 | 331 |
1 files changed, 146 insertions, 185 deletions
@@ -1,24 +1,24 @@ -.Dd 2 February, 2024 +.Dd 13 November, 2024 .Dt GRAB 1 -.Os Grab 2.2.3 +.Os Grab 3.0.0 .Sh NAME .Nm grab , .Nm "git grab" .Nd search for patterns in files .Sh SYNOPSIS .Nm -.Op Fl s | z -.Op Fl bcfinU +.Op Fl H Ar never | multi | always +.Op Fl bcilLpsUz .Ar pattern .Op Ar .Nm .Fl h .Pp .Nm "git grab" -.Op Fl s | z -.Op Fl bcinU +.Op Fl H Ar never | multi | always +.Op Fl bcilLpsUz .Ar pattern -.Op Ar glob ... +.Op Ar "glob ..." .Nm "git grab" .Fl h .Sh DESCRIPTION @@ -33,9 +33,7 @@ Unlike the utility, .Nm is not strictly line-oriented; -instead of always matching on complete lines, -the user defines the structure of the text they would like to match and -filters on the results. +the structure of matches is left up to the user to define. For more details on the pattern syntax, see .Sx Pattern Syntax . .Pp @@ -43,19 +41,12 @@ The .Nm "git grab" utility is identical to the .Nm -utility in all ways bar two exceptions. -The first is that if no files -.Pq globs in this case to be precise -are specified, -input is not read from the standard-input but instead from all non-binary -files in the current git-repository. -If the user provides one or more globs, -only the non-binary files in the current git-repository that match one or -more of the given globs will be processed. -Secondly, the -.Fl f -option is not available; -its behavior is always assumed and cannot be disabled. +utility except that it takes globs matching files as command-line +arguments instead of files, +and processes all non-binary files in the current git repository that +match the provided globs. +If no globs are provided, +all non-binary files in the current git repository are processed. .Pp .Nm will read from the files provided on the command-line. @@ -65,25 +56,18 @@ The special filename can also be provided, which represents the standard-input. .Pp -The default behavior of -.Nm -is to print pattern matches to the standard-output. -If more than one file argument is provided, -matches will be prefixed by their respective filename and the position of -the match, -colon-separated. -Note that this behavior is modified by the -.Fl b , -.Fl f -and -.Fl z -options. +Similar to the +.Xr grep 1 +utility matches are printed to the standard output. +They are additionally prefixed with the name of the file in which +.Ar pattern +was matched, as well as the location of the match. .Pp The options are as follows: .Bl -tag -width Ds .It Fl b , Fl Fl byte\-offset -Report the positions of pattern matches using the byte offset/position in -the file instead of the line and column. +Report the positions of pattern matches as the (zero-based) byte offset +of the match from the beginning of the file. .Pp This option is useful if your text editor .Pq such as Xr vim 1 or Xr emacs 1 @@ -96,115 +80,91 @@ This is useful when piping the output of into a pager such as .Xr less 1 . .Pp -Even when this option is specified, -if the -.Ev TERM -environment variable is set to -.Sq dumb , -no color will be output. -.It Fl f , Fl Fl filenames -Always prefix matches with the names of the files in which the matches -were made, -even if only 1 file was provided. -.Pp -This option is always enabled when using -.Nm "git grab" . +This option takes precedence over the environment variables described in +.Sx ENVIRONMENT +that relate to the usage of color. .It Fl h , Fl Fl help Display help information by opening this manual page. +.It Fl H , Fl Fl header\-line Ns = Ns Ar when +Control the usage of a dedicated header line, +where the filename and match position are printed on a dedicated line +above the match. +The available options for +.Ar when +are: +.Pp +.Bl -tag -width Ds -compact +.It never +never use a dedicated header line +.It always +always use a dedicated header line +.It multi +use a dedicated header line when the matched pattern spans multiple lines +.El .It Fl i , Fl Fl ignore\-case Match patterns case-insensitively. -When PCRE support is available this option respects Unicode -.Po -i.e. the pattern -.Sq x/ß/ -will match -.Sq ẞ -.Pc . -.It Fl n , Fl Fl newline -Treat the newline as a special character by disallowing the dot -.Pq Sq \&. -wildcard from matching newlines in regular expressions. -.Pp -This option may behave strangely when -.Nm -is not compiled with PCRE support. -See -.Sx CAVEATS -for more information. +.It Fl l , Fl Fl literal +Treat patterns as literal strings, +i.e. don’t interpret them as regular expressions. +.It Fl L , Fl Fl line\-position +Report the positions of matches as a (one-based) line- and column +position separated by a colon. +.Pp +This option is the default behaviour if the +.Fl b +option is not supplied, +but is provided as a means to override the +.Fl b +option. +.It Fl p , Fl Fl predicate +Return an exit status indicating if a match was found without writing any +output to the standard output. +When simply checking for the presence of a pattern in an input, +this option is far more efficient than redirecting output to +.Pa /dev/null . .It Fl s , Fl Fl strip\-newline Don’t print a newline at the end of a match if the match already ends in a newline. This can make output seem more .Sq natural , as many matches will already have terminating newlines. -.Pp -This option is mutually exclusive with the -.Fl z -option. .It Fl U , Fl Fl no\-unicode Don’t use Unicode properties when matching \ed, \ew, etc. Recognize only ASCII values instead. -.Pp -If -.Nm -is not compiled with PCRE support this option will cause the program to -terminate with exit status 2. .It Fl z , Fl Fl zero Separate output data by null bytes .Pq Sq \e0 instead of newlines. This option can be used to process matches containing newlines. -.Pp -If combined with the -.Fl f -option, -or if two or more files were provided as arguments, -filenames and matches will be separated by null bytes instead of colons. -.Pp -This option is mutually exclusive with the -.Fl s -option. .El -.Ss Regular Expression Syntax -By default -.Nm -supports Perl-compatible regular expressions -.Pq Sq PCREs , -however it is possible to build and install -.Nm -without support for PCREs. -When built without PCRE support, -POSIX extended-regular-expressions are used instead. -.Pp -You should always assume that PCRE support is available, -but if you would like to be absolutely sure you can check if the program -terminates unsuccessfully when using the -.Fl U -option. .Ss Pattern Syntax -A pattern is a sequence of commands optionally separated by whitespace. -A command is an operator followed by a delimiter, a regular expression, -and then terminated by the same delimiter. The last command of a pattern -need not have a terminating delimiter. +A pattern is a sequence of whitespace-separated commands. +A command is a sequence of an operator, +an opening delimiter, +a regular expression, +a closing delimter, +and zero-or-more flags. +The last command of a pattern if given no flags need not have a closing +delimter. .Pp The supported operators are as follows: .Pp .Bl -tag -compact .It g -Keep everything that matches the given regex. +Keep matches that match the given regex. .It G -Keep everything that doesn’t match the given regex. +Keep matches that don’t match the given regex. .It h -Highlight everything that matches the given regex. +Highlight substrings in matches that match the given regex. .It H -Highlight everything that doesn’t match the given regex. +Highlight substrings in matches that don’t match the given regex. .It x Select everything that matches the given regex. .It X Select everything that doesn’t match the given regex. .El .Pp -An example pattern to match all numbers that contain a ‘3’ but aren’t +An example pattern to match all numbers that contain a ‘3’ but aren’t ‘1337’ could be .Sq x/[0\-9]+/ g/3/ G/^1337$/ . In that pattern, @@ -216,8 +176,8 @@ and .Sq G/^1337$/ filters out the specific number 1337. .Pp -The delimiter used for each given operator can be any valid UTF-8 -codepoint. +The opening- and closing-delimiter used for each given command can be any +valid UTF-8 codepoint. As a result, the following pattern using the delimiters .Sq | , @@ -226,7 +186,31 @@ and .Sq ä is well-formed: .Pp -.Dl x|[0\-9]+| g.3. Gä^1337ä +.Dl x|[0\-9]+| g.3. Gä^1337$ä +.Pp +Delimeters also respect the Unicode +.Sq Bidirectional Paired Bracket +property. +This means that alongside the previous examples, +the following non-exhaustive list of character pairs may be used as +opening- and closing delimiters: +.Pp +.Bl -bullet -compact +.It +｢…｣ +.It +⟮…⟯ +.It +⟨…⟩ +.El +.Pp +It is not recommended that you use characters that have a special meaning +in regular expression syntax as delimiters, +unless you’re using literal patterns via the +.Fl l +option or the +.Sq l +command flag. .Pp Operators are not allowed to take empty regular expression arguments with one exception: @@ -238,57 +222,59 @@ operator assumes the same regular expression as the previous operator. This allows you to avoid duplication in the common case where a user wishes to highlight text matched by a .Sq g +or +.Sq x operator. The following example pattern selects all words that have a capital letter, and highlights the capital letter(s): .Pp -.Dl x/\ew+/ g/[A\-Z]/ h// +.Dl x/\ew+/ g/\ep{Lu}/ h// .Pp The empty .Sq h operator is not permitted as the first operator in a pattern. -.Sh ENVIRONMENT -.Bl -tag -width GRAB_COLORS -.It Ev GRAB_COLORS -A comma-separated list of color options in the form -.Sq key=val . -The value specified by -.Ar val -must be a SGR parameter. -For more information see -.Sx "SEE ALSO" . -.Pp -The keys are as follows: +.Pp +While various command-line options exist to alter the behaviour of +patterns such as +.Fl i +to enable case-insensitive matching or +.Fl U +to disable Unicode support, +various different options can also be set at the command-level by +appending a command with one-or-more flags. +As an example, +one could match all sequences of one-or-more non-whitespace characters +that contain the case-insensitive literal string +.Sq [hi] +by using the following pattern: +.Pp +.Dl x/\eS+/ g/[hi]/li +.Pp +The currently supported flags are as follows: .Pp .Bl -tag -compact -.It fn -filenames prefixing any content line. -.It hl -text matched by an -.Sq h -or -.Sq H -command. -.It ln -line- and column-numbers, -as well as byte offsets when reporting the location of a match. -.It se -separators inserted between filenames and content lines. +.It i/I +enable or disable case-insensitive matching respectively +.It l/L +enable or disable treating the supplied regex as a fixed string +.It u/U +enable or disable Unicode support respectively .El -.Pp -The default value is -.Sq fn=35,hl=01;31,ln=32,se=36 +.Sh ENVIRONMENT .It Ev NO_COLOR Do not display any colored output when set to a non-empty string, even if the standard-output is a terminal. +This environment variable takes precedence over +.Ev CLICOLOR_FORCE . +.It Ev CLICOLOR_FORCE +Force display of colored output when set to a non-empty string, +even if the standard-output isn’t a terminal. .It Ev TERM If set to .Sq dumb disables colored output, -even when the -.Fl c -option is provided. +taking precedence over all other environment variables. .El .Sh EXIT STATUS The @@ -301,20 +287,18 @@ One or more matches were selected. .It Li 1 No matches were selected. .It Li 2 -The -.Fl U -option was passed but -.Nm -wasn’t built with PCRE support. +A non-fatal error occured, +such as failure to read a file. .It Li >2 -An error occured. +A fatal error occured. .El .Sh EXAMPLES List all your systems CPU flags, sorted and without duplicates: .Pp -.Dl $ grab -n 'x/^flags.*/ x/\ew+/ G/flags/' /proc/cpuinfo | sort | uniq +.Dl $ grab 'x/^flags.*?$/ x/\ew+/ G/^flags$/' </proc/cpuinfo | sort -u .Pp -Search for a pattern in multiple files without printing filenames: +Search for a pattern in multiple files without printing filenames or +position information: .Pp .Dl $ cat file1 file2 file3 | grab 'x/pattern/' .Pp @@ -332,15 +316,7 @@ Extract bibliographic references from .Xr mdoc 7 formatted manual pages: .Pp -.Dl $ grab \-n 'x/(^\e.%.*\en)+/' foo.1 bar.1 -.Pp -Extract the -.Sx SYNOPSIS -section from the given -.Xr mdoc 7 -formatted manual pages: -.Pp -.Dl $ grab \-n 'x/^\e.Sh SYNOPSIS\en(^.*\en(?!^\e.Sh))+/' foo.1 bar.1 +.Dl $ grab 'x/(^\e.%.*?\en)+/' foo.1 bar.1 .Sh SEE ALSO .Xr git 1 , .Xr grep 1 , @@ -358,27 +334,12 @@ formatted manual pages: .Lk https://en.wikipedia.org/wiki/ANSI_escape_code#SGR "SGR Parameters" .Sh AUTHORS .An Thomas Voss Aq Mt mail@thomasvoss.com -.Sh CAVEATS -The behavior of negated character classes in regular expressions will -vary when given the -.Fl n -option depending on if PCRE support is or isn’t available. -.Pp -When PCRE support is available and the -.Fl n -option is provided, -the regular expression -.Ql [^a] -will nonetheless match the newline character. -When PCRE support is not available and the -.Fl n -option is provided, -the newline will -.Em not -be matched by -.Ql [^a] . +.Sh NOTES +When pattern matching with literal strings you should avoid using +delimeters that are contained within the search string as any backslashes +used to escape the delimeters will be searched for in the text literally. .Sh BUGS The pattern string provided as a command-line argument as well as the provided input files must be encoded as UTF-8. No other encodings are supported unless they are UTF-8 compatible, -such as ASCII. +such as ASCII.
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