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diff --git a/doc/nimgrep.md b/doc/nimgrep.md new file mode 100644 index 000000000..63f760051 --- /dev/null +++ b/doc/nimgrep.md @@ -0,0 +1,128 @@ +========================= + nimgrep User's manual +========================= + +:Author: Andreas Rumpf +:Version: 1.6.0 + +.. default-role:: option +.. contents:: + +Nimgrep is a command line tool for search and replace tasks. It can search for +regex or peg patterns and can search whole directories at once. User +confirmation for every single replace operation can be requested. + +Nimgrep has particularly good support for Nim's +eccentric *style insensitivity* (see option `-y` below). +Apart from that it is a generic text manipulation tool. + + +Installation +============ + +Compile nimgrep with the command: + + ```cmd + nim c -d:release tools/nimgrep.nim + ``` + +And copy the executable somewhere in your ``$PATH``. + + +Command line switches +===================== + +.. include:: nimgrep_cmdline.txt + +Path filter options +------------------- + +Let us assume we have file `dirA/dirB/dirC/file.nim`. +Filesystem path options will match for these parts of the path: + +| option | matches for | +| :------------------ | :-------------------------------- | +| `--[not]extensions` | ``nim`` | +| `--[not]filename` | ``file.nim`` | +| `--[not]dirname` | ``dirA`` and ``dirB`` and ``dirC`` | +| `--[not]dirpath` | ``dirA/dirB/dirC`` | + +Combining multiple filter options together and negating them +------------------------------------------------------------ + +Options for filtering can be provided multiple times so they form a list, +which works as: +* positive filters + `--filename`, `--dirname`, `--dirpath`, `--inContext`, + `--inFile` accept files/matches if *any* pattern from the list is hit +* negative filters + `--notfilename`, `--notdirname`, `--notdirpath`, `--notinContext`, + `--notinFile` accept files/matches if *no* pattern from the list is hit. + +In other words the same filtering option repeated many times means logical OR. + +.. Important:: + Different filtering options are related by logical AND: they all must + be true for a match to be accepted. + E.g. `--filename:F --dirname:D1 --notdirname:D2` means + `filename(F) AND dirname(D1) AND (NOT dirname(D2))`. + +So negative filtering patterns are effectively related by logical OR also: +`(NOT PAT1) AND (NOT PAT2) == NOT (PAT1 OR PAT2)`:literal: in pseudo-code. + +That means you can always use only 1 such an option with logical OR, e.g. +`--notdirname:PAT1 --notdirname:PAT2` is fully equivalent to +`--notdirname:'PAT1|PAT2'`. + +.. Note:: + If you want logical AND on patterns you should compose 1 appropriate pattern, + possibly combined with multi-line mode `(?s)`:literal:. + E.g. to require that multi-line context of matches has occurrences of + **both** PAT1 and PAT2 use positive lookaheads (`(?=PAT)`:literal:): + ```cmd + nimgrep --inContext:'(?s)(?=.*PAT1)(?=.*PAT2)' + ``` + +Meaning of `^`:literal: and `$`:literal: +======================================== + +`nimgrep`:cmd: PCRE engine is run in a single-line mode so +`^`:literal: matches the beginning of whole input *file* and +`$`:literal: matches the end of *file* (or whole input *string* for +options like `--filename`). + +Add the `(?m)`:literal: modifier to the beginning of your pattern for +`^`:literal: and `$`:literal: to match the beginnings and ends of *lines*. + +Examples +======== + +All examples below use default PCRE Regex patterns: + ++ To search recursively in Nim files using style-insensitive identifiers: + + ```cmd + nimgrep --recursive --ext:'nim|nims' --ignoreStyle + # short: -r --ext:'nim|nims' -y + ``` + + .. Note:: we used `'` quotes to avoid special treatment of `|` symbol + for shells like Bash + ++ To exclude version control directories (Git, Mercurial=hg, Subversion=svn) + from the search: + ```cmd + nimgrep --notdirname:'^\.git$' --notdirname:'^\.hg$' --notdirname:'^\.svn$' + # short: --ndi:'^\.git$' --ndi:'^\.hg$' --ndi:'^\.svn$' + ``` ++ To search only in paths containing the `tests`:literal: sub-directory + recursively: + ```cmd + nimgrep --recursive --dirname:'^tests$' + # short: -r --di:'^tests$' + # or using --dirpath: + nimgrep --recursive --dirpath:'(^|/)tests($|/)' + # short: -r --pa:'(^|/)tests($|/)' + ``` ++ Nimgrep can search multi-line, e.g. to find files containing `import`:literal: + and then `strutils`:literal: use pattern `'import(.|\n)*?strutils'`:literal:. |