Ack 中的filtertype

The ack manual says:

 

 

       −−ignore−file=FILTERTYPE:FILTERARGS

           Ignore files matching FILTERTYPE:FILTERARGS.  The filters are

           specified identically to file type filters as seen in "Defining

           your own types".

 

Defining your own types

       ack allows you to define your own types in addition to the predefined

       types. This is done with command line options that are best put into an

       .ackrc file − then you do not have to define your types over and over

       again. In the following examples the options will always be shown on

       one command line so that they can be easily copy & pasted.

 

       ack −−perl foo searches for foo in all perl files. ack −−help=types

       tells you, that perl files are files ending in .pl, .pm, .pod or .t. So

       what if you would like to include .xs files as well when searching for

       −−perl files? ack −−type−add perl:ext:xs −−perl foo does this for you.

       −−type−add appends additional extensions to an existing type.

 

       If you want to define a new type, or completely redefine an existing

       type, then use −−type−set. ack −−type−set eiffel:ext:e,eiffel defines

       the type eiffel to include files with the extensions .e or .eiffel. So

       to search for all eiffel files containing the word Bertrand use ack

       −−type−set eiffel:ext:e,eiffel −−eiffel Bertrand.  As usual, you can

       also write −−type=eiffel instead of −−eiffel. Negation also works, so

       −−noeiffel excludes all eiffel files from a search. Redefining also

       works: ack −−type−set cc:ext:c,h and .xs files no longer belong to the

       type cc.

 

       When defining your own types in the .ackrc file you have to use the

       following:

 

         −−type−set=eiffel:ext:e,eiffel

 

       or writing on separate lines

 

         −−type−set

         eiffel:ext:e,eiffel

 

       The following does NOT work in the .ackrc file:

 

         −−type−set eiffel:ext:e,eiffel

 

       In order to see all currently defined types, use −−help−types, e.g.

       ack −−type−set backup:ext:bak −−type−add perl:ext:perl −−help−types

 

       In addition to filtering based on extension (like ack 1.x allowed), ack

       2 offers additional filter types.  The generic syntax is −−type−set

       TYPE:FILTER:FILTERARGS; FILTERARGS depends on the value of FILTER.

 

       is:FILENAME

           is filters match the target filename exactly.  It takes exactly one

           argument, which is the name of the file to match.

 

           Example:

 

               −−type−set make:is:Makefile

 

       ext:EXTENSION[,EXTENSION2[,...]]

           ext filters match the extension of the target file against a list

           of extensions.  No leading dot is needed for the extensions.

 

           Example:

 

               −−type−set perl:ext:pl,pm,t

 

       match:PATTERN

           match filters match the target filename against a regular

           expression.  The regular expression is made case insensitive for

           the search.

 

           Example:

 

               −−type−set make:match:/(gnu)?makefile/

 

       firstlinematch:PATTERN

           firstlinematch matches the first line of the target file against a

           regular expression.  Like match, the regular expression is made

           case insensitive.

 

           Example:

 

               −−type−add perl:firstlinematch:/perl/

 

       More filter types may be made available in the future.

 

 

 

Thanks,