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# cgrep
`grep` for C/C++ source files.
Should be more or less fine for other C-family languages as well but I haven't tested for those since I don't use those. Let me know if you run into trouble using cgrep on those.
The goal is to make the options and features as similar to `grep` as possible for ease of use.
## Building
Assuming you have the llvm/clang libraries(the build file will read your llvm options using `llvm-config` so make sure it's in path), just run:
```bash
git clone https://github.com/bloodstalker/cgrep
git submodule init
git submodule update
make
```
If you have installed LLVM but don't have `llvm-config`, you are missing the dev package for LLVM.
`cgrep` supports LLVM 5,6,8,9. For 10. the latest tested trunk version is:367652.
The makefile assumes clang is called `clang` and llvm-config is called `llvm-config`. On some distros, the names might not be the same. In those cases use `CXX` and `LLVM_CONF` to pass the values to the makefile like so:
```bash
make CXX=clang-9.0 LLVM_CONF=llvm-config-9.0
```
## Usage
A simple usage example:
```bash
cgrep -A 1 -B 1 --func --var --regex n[aA]m ./cgrep.cpp
```
Pleade do note that the regex will pass through both C++ and the regex engine, so if you would want to escape `\`, the regex you pass as the commandline arg would be `\\\\` instead of the normal `\\`.
In order for cgrep to work, you need to have a compilation database, tools like `cmake` can generate one for you.
If your build tool doesn't do that, you can just use [bear](https://github.com/rizsotto/Bear) or [scan-build](https://github.com/rizsotto/scan-build).
You can also skip the compilation database alltogether passing cgrep `--` after the input file name which means you have chosen not to pass it anything.
You can pass the options by hand since cgrep is a Clang instance so it recognizes every option clang has.
cgrep uses ANSI escape sequences for colors so your terminal should support those.
## Options
Here's an option list though it might not be necessarily up-to-date.
For an up-to-date list, you can run `crep --help`.
```bash
-A= - same as grep, how many lines after the matched line to print
-B= - same as grep, howm many lines before the matched line to print
--all - turns on all switches other than nameddecl
--awk - outputs location in a gawk freidnly format
--call - match function calls only
--class - match class declrations only
--cxxcall - match member function calls only
--declrefexpr - matches declrefexpr
--dir= - recursively goes through all the files and directories. assumes compilation databases are present for all source files.
--extra-arg= - Additional argument to append to the compiler command line
--extra-arg-before= - Additional argument to prepend to the compiler command line
--func - match functions only
--header - match headers in header inclusions
--macro - match macro definitions
--mainfile - match identifiers in the main file only
--memfunc - match member functions only
--memvar - match member variables only
--nameddecl - matches all named declrations
-p= - Build path
--regex= - the regex to match against
--struct - match structures only
--syshdr - match identifiers in system header as well
--union - match unions only
--var - match variables only
```
`cgrep` is a clang tool, so it will accecpt all valid clang commandline options.
## Known Issues
* bulding cgrep with `-j` will not work because bad makefile.
* the coloring is off right now and doesn't work properly.
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## License
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=======