peco

peco

Simplistic interactive filtering tool

Description

peco is based on percol. The idea is that percol was darn useful, but I wanted a tool that was a single binary. peco is written in Go, and as of this writing only implements the basic filtering feature (mainly because that's the only thing I use -- you're welcome to send me pull requests to make peco more compatible with percol).

peco can be a great tool to filter stuff like logs, process stats, find files, because unlike grep, you can type as you think and look through the current results.

Demo

Demos speak more than a thousand words! Here's me looking for a process on my mac. As you can see, you can page through your results, and you can keep changing the query:

Here's me trying to figure out which file to open:

When you combine tools like zsh, peco, and ghq, you can make managing/moving around your huge dev area a piece of cake! (this example doesn't use zsh functions so you can see what I'm doing)

Features

Incremental search

Search results are filtered as you type. This is great to drill down to the line you are looking for

Multiple terms turn the query into an "AND" query:

When you find that line that you want, press enter, and the resulting line is printed to stdout, which allows you to pipe it to other tools

Select Matchers

Different types of matchers are available. Default is case-insensitive matcher, so lines with any case will match. You can toggle between IgnoreCase, CaseSensitive, and RegExp matchers. The RegExp matcher allows you to use any valid regular expression to match lines

Works on Windows!

I have been told that peco even works on windows :)

Installation

Mac OS X / Homebrew

If you're on OS X and want to use homebrew, use my custom tap:

brew tap lestrrat/peco
brew install peco

go get

If you want to go the Go way (install in GOPATH/bin) and just want the command:

go get github.com/lestrrat/peco/cmd/peco

Usage

If you can read Japanese, here's one cool usage using ghq

Basically, you can define a simple function to easily move around your source code tree:

function peco-src () {
    local selected_dir=$(ghq list --full-path | peco --query "$LBUFFER")
    if [ -n "$selected_dir" ]; then
        BUFFER="cd ${selected_dir}"
        zle accept-line
    fi    
    zle clear-screen
}         
zle -N peco-src

Or to easily navigate godoc for your local stuff:

function peco-godoc() { 
    local selected_dir=$(ghq list --full-path | peco --query "$LBUFFER")
    if [ -n "$selected_dir" ]; then
        BUFFER="godoc ${selected_dir} | less"
        zle accept-line 
    fi 
    zle clear-screen 
}
    
zle -N peco-godoc 

Command Line Options

--help

Display a help message

--query

Specifies the default query to be used upon startup. This is useful for scripts and functions where you can figure out before hand what the most likely query string is.

--rcfile

Pass peco a configuration file, which currently must be a JSON file. If unspecified it will try a series of files by default. See Configuration File for the actual locationes searched.

--no-ignore-case

By default peco starts in case insensitive mode. When this option is specified, peco will start in case sensitive mode. This can be toggled while peco is still in session.

Configuration File

peco by default consults a few locations for the config files.

1. Location specified in --rcfile. If this doesn't exist, peco complains and exits
2. $XDG_CONFIG_HOME/config.json
3. $HOME/.config/peco/config.json
4. for each directories listed in $XDG_CONFIG_DIRS, $DIR/peco/config.json
5. If all else fails, $HOME/.peco/config.json

Below are configuration sections that you may specify in your config file:

Keymaps

Example:

{
    "Keymap": {
        "C-p": "peco.SelectPrevious",
        "C-n": "peco.SelectNext"
    }
}

Available keys

Available actions

Styles

For now, styles of following 3 items can be customized in config.json.

{
    "Style": {
        "Basic": ["on_default", "default"],
        "Selected": ["underline", "on_cyan", "black"],
        "Query": ["yellow", "bold"]
    }
}

Foreground Colors

• "black" for termbox.ColorBlack
• "red" for termbox.ColorRed
• "green" for termbox.ColorGreen
• "yellow" for termbox.ColorYellow
• "blue" for termbox.ColorBlue
• "magenta" for termbox.ColorMagenta
• "cyan" for termbox.ColorCyan
• "white" for termbox.ColorWhite

Background Colors

• "on_black" for termbox.ColorBlack
• "on_red" for termbox.ColorRed
• "on_green" for termbox.ColorGreen
• "on_yellow" for termbox.ColorYellow
• "on_blue" for termbox.ColorBlue
• "on_magenta" for termbox.ColorMagenta
• "on_cyan" for termbox.ColorCyan
• "on_white" for termbox.ColorWhite

Attributes

• "bold" for termbox.AttrBold
• "underline" for termbox.AttrUnderline
• "blink" for termbox.AttrReverse

CustomMatcher

This is an experimental feature. Please note that some details of this specificaiton may change

By default peco comes with IgnoreCase, CaseSensitive, and Regexp matchers, but since v0.1.3, it is possible to create your own custom matcher.

The matcher will be executed via Command.Run() as an external process, and it will be passed the query values in the command line, and the original unaltered buffer is passed via os.Stdin. Your matcher must perform the matching, and print out to os.Stdout matched lines. Note that currently there is no way to specify where in the line the match occurred.

Once you have a matcher, you must specify how the matcher is spawned:

{
    "CustomMatcher": {
        "MyMatcher": [ "/path/to/my-matcher", "$QUERY" ]
    }
}

Elements in the CustomMatcher section are string keys to array of program arguments. The special token $QUERY will be replaced with the unaltered query as the user typed in (i.e. multiple-word queries will be passed as a single string). You may pass in any other arguments in this array.

You may specify as many matchers as you like.

Examples

• C/Migemo

Hacking

First, fork this repo, and get your clone locally.

1. Make sure you have go 1.x, with GOPATH appropriately set
2. Run go get github.com/jessevdk/go-flags
3. Run go get github.com/mattn/go-runewidth
4. Run go get github.com/nsf/termbox-go

Note that we have a Godeps file in source tree, for now it's just there for a peace of mind. If you already know about godep, when you may use that instead of steps 2~4

Then from the root of this repository run:

go build cmd/peco/peco.go

This will create a peco binary in the local directory.

TODO

Test it. In doing so, we may change the repo structure

Implement all(?) of the original percol options

AUTHORS

• Daisuke Maki (lestrrat)
• Shinya Ohyanagi
• syohex
• Takashi Kokubun
• cho45
• cubicdaiya
• mattn
• swdyh

Notes

Obviously, kudos to the original percol: https://github.com/mooz/percol Much code stolen from https://github.com/mattn/gof