Rewrite fzf in Go

.gitignore

@@ -1,3 +1,5 @@
+bin
+src/fzf/fzf_*
 pkg
 Gemfile.lock
 .DS_Store

install

@@ -3,60 +3,81 @@
 cd `dirname $BASH_SOURCE`
 fzf_base=`pwd`
 
-# ruby executable
-echo -n "Checking Ruby executable ... "
-ruby=`which ruby`
-if [ $? -ne 0 ]; then
-  echo "ruby executable not found!"
-  exit 1
-fi
-
-# System ruby is preferred
-system_ruby=/usr/bin/ruby
-if [ -x $system_ruby -a $system_ruby != "$ruby" ]; then
-  $system_ruby --disable-gems -rcurses -e0 2> /dev/null
-  [ $? -eq 0 ] && ruby=$system_ruby
-fi
-
-echo "OK ($ruby)"
+ARCHI=$(uname -sm)
 
-# Curses-support
-echo -n "Checking Curses support ... "
-"$ruby" -rcurses -e0 2> /dev/null
-if [ $? -eq 0 ]; then
-  echo "OK"
-else
-  echo "Not found"
-  echo "Installing 'curses' gem ... "
-  if (( EUID )); then
-    /usr/bin/env gem install curses --user-install
+download() {
+  echo "Downloading fzf executable ($1) ..."
+  if curl -fLo "$fzf_base"/bin/fzf https://github.com/junegunn/fzf-bin/releases/download/snapshot/$1; then
+    chmod +x "$fzf_base"/bin/fzf
   else
-    /usr/bin/env gem install curses
+    echo "Failed to download $1"
+    exit 1
   fi
+}
+
+mkdir -p "$fzf_base"/bin
+if [ "$ARCHI" = "Darwin x86_64" ]; then
+  download fzf_darwin_amd64
+elif [ "$ARCHI" = "Linux x86_64" ]; then
+  download fzf_linux_amd64
+else # No prebuilt executable
+  echo "No prebuilt binary for $ARCHI ... Installing legacy Ruby version ..."
+
+  # ruby executable
+  echo -n "Checking Ruby executable ... "
+  ruby=`which ruby`
   if [ $? -ne 0 ]; then
-    echo
-    echo "Failed to install 'curses' gem."
-    if [[ $(uname -r) =~ 'ARCH' ]]; then
-      echo "Make sure that base-devel package group is installed."
-    fi
+    echo "ruby executable not found!"
     exit 1
   fi
-fi
 
-# Ruby version
-echo -n "Checking Ruby version ... "
-"$ruby" -e 'exit RUBY_VERSION >= "1.9"'
-if [ $? -eq 0 ]; then
-  echo ">= 1.9"
-  "$ruby" --disable-gems -rcurses -e0 2> /dev/null
+  # System ruby is preferred
+  system_ruby=/usr/bin/ruby
+  if [ -x $system_ruby -a $system_ruby != "$ruby" ]; then
+    $system_ruby --disable-gems -rcurses -e0 2> /dev/null
+    [ $? -eq 0 ] && ruby=$system_ruby
+  fi
+
+  echo "OK ($ruby)"
+
+  # Curses-support
+  echo -n "Checking Curses support ... "
+  "$ruby" -rcurses -e0 2> /dev/null
+  if [ $? -eq 0 ]; then
+    echo "OK"
+  else
+    echo "Not found"
+    echo "Installing 'curses' gem ... "
+    if (( EUID )); then
+      /usr/bin/env gem install curses --user-install
+    else
+      /usr/bin/env gem install curses
+    fi
+    if [ $? -ne 0 ]; then
+      echo
+      echo "Failed to install 'curses' gem."
+      if [[ $(uname -r) =~ 'ARCH' ]]; then
+        echo "Make sure that base-devel package group is installed."
+      fi
+      exit 1
+    fi
+  fi
+
+  # Ruby version
+  echo -n "Checking Ruby version ... "
+  "$ruby" -e 'exit RUBY_VERSION >= "1.9"'
   if [ $? -eq 0 ]; then
-    fzf_cmd="$ruby --disable-gems $fzf_base/fzf"
+    echo ">= 1.9"
+    "$ruby" --disable-gems -rcurses -e0 2> /dev/null
+    if [ $? -eq 0 ]; then
+      fzf_cmd="$ruby --disable-gems $fzf_base/fzf"
+    else
+      fzf_cmd="$ruby $fzf_base/fzf"
+    fi
   else
+    echo "< 1.9"
     fzf_cmd="$ruby $fzf_base/fzf"
   fi
-else
-  echo "< 1.9"
-  fzf_cmd="$ruby $fzf_base/fzf"
 fi
 
 # Auto-completion
@@ -85,10 +106,17 @@ for shell in bash zsh; do
 # Setup fzf function
 # ------------------
 unalias fzf 2> /dev/null
-fzf() {
-  $fzf_cmd "\$@"
-}
-export -f fzf > /dev/null
+unset fzf 2> /dev/null
+if [ -x "$fzf_base/bin/fzf" ]; then
+  if [[ ! "\$PATH" =~ "$fzf_base/bin" ]]; then
+    export PATH="$fzf_base/bin:\$PATH"
+  fi
+else
+  fzf() {
+    $fzf_cmd "\$@"
+  }
+  export -f fzf > /dev/null
+fi
 
 # Auto-completion
 # ---------------

src/Dockerfile

@@ -0,0 +1,33 @@
+FROM ubuntu:14.04
+MAINTAINER Junegunn Choi <junegunn.c@gmail.com>
+
+# apt-get
+RUN apt-get update && apt-get -y upgrade
+RUN apt-get install -y --force-yes git vim-nox curl procps sudo \
+                                   build-essential libncurses-dev
+
+# Setup jg user with sudo privilege
+RUN useradd -s /bin/bash -m jg && echo 'jg:jg' | chpasswd && \
+    echo 'jg ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers.d/jg
+
+# Setup dotfiles
+USER jg
+RUN cd ~ && git clone https://github.com/junegunn/dotfiles.git && \
+    dotfiles/install > /dev/null
+
+# Install Go 1.4
+RUN cd ~ && curl https://storage.googleapis.com/golang/go1.4.linux-amd64.tar.gz | tar -xz && \
+    mv go go1.4 && \
+    echo 'export GOROOT=~/go1.4' >> ~/dotfiles/bashrc-extra && \
+    echo 'export PATH=~/go1.4/bin:$PATH' >> ~/dotfiles/bashrc-extra
+
+# Symlink fzf directory
+RUN mkdir -p ~jg/go/src/github.com/junegunn && \
+    ln -s /fzf ~jg/go/src/github.com/junegunn/fzf
+
+# Volume
+VOLUME /fzf
+
+# Default CMD
+CMD cd ~jg/go/src/github.com/junegunn/fzf/src && /bin/bash -l
+

src/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Junegunn Choi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

src/Makefile

@@ -0,0 +1,49 @@
+BINARY := fzf/fzf
+
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S),Darwin)
+	BINARY := $(BINARY)_darwin
+else ifeq ($(UNAME_S),Linux)
+	BINARY := $(BINARY)_linux
+endif
+
+UNAME_M := $(shell uname -m)
+ifneq ($(filter i386 i686,$(UNAME_M)),)
+$(error "filtered is not supported, yet.")
+endif
+
+ifeq ($(UNAME_M),x86_64)
+	BINARY := $(BINARY)_amd64
+else ifneq ($(filter i386 i686,$(UNAME_M)),)
+	BINARY := $(BINARY)_386
+else # TODO
+$(error "$(UNAME_M) is not supported, yet.")
+endif
+
+BINDIR  = ../bin
+SOURCES = $(wildcard *.go fzf/*.go)
+
+all: build
+
+build: $(BINARY)
+
+$(BINARY): $(SOURCES)
+	go get
+	go test -v
+	cd fzf && go build -o $(notdir $(BINARY))
+
+install: $(BINARY)
+	mkdir -p $(BINDIR)
+	cp -f $(BINARY) $(BINDIR)/fzf
+
+clean:
+	rm -f $(BINARY)
+
+docker:
+	docker build -t junegunn/ubuntu-sandbox .
+
+linux64:
+	docker run -i -t -u jg -v $(shell cd ..; pwd):/fzf junegunn/ubuntu-sandbox \
+		/bin/bash -ci 'cd ~jg/go/src/github.com/junegunn/fzf/src; make build'
+
+.PHONY: build install linux64 clean docker run

src/README.md

@@ -0,0 +1,59 @@
+fzf in Go
+=========
+
+This directory contains the source code for the new fzf implementation in Go.
+This new version has the following benefits over the previous Ruby version.
+
+- Immensely faster
+    - No GIL. Performance is linearly proportional to the number of cores.
+    - It's so fast that I even decided to remove the sort limit (`--sort=N`)
+- Does not require Ruby and distributed as an executable binary
+    - Ruby dependency is especially painful on Ruby 2.1 or above which
+      ships without curses gem
+
+Build
+-----
+
+```sh
+# Build fzf executable
+make
+
+# Install the executable to ../bin directory
+make install
+
+# Build executable for Linux x86_64 using Docker
+make linux64
+```
+
+
+Prebuilt binaries
+-----------------
+
+- Darwin x86_64
+- Linux x86_64
+
+Third-party libraries used
+--------------------------
+
+- [ncurses](https://www.gnu.org/software/ncurses/)
+- [mattn/go-runewidth](https://github.com/mattn/go-runewidth)
+    - Licensed under [MIT](http://mattn.mit-license.org/2013)
+- [mattn/go-shellwords](https://github.com/mattn/go-shellwords)
+    - Licensed under [MIT](http://mattn.mit-license.org/2014)
+
+Contribution
+------------
+
+For the moment, I will not add or accept any new features until we can be sure
+that the implementation is stable and we have a sufficient number of test
+cases. However, fixes for obvious bugs and new test cases are welcome.
+
+I also care much about the performance of the implementation (that's the
+reason I rewrote the whole thing in Go, right?), so please make sure that your
+change does not result in performance regression. Please be minded that we
+still don't have a quantitative measure of the performance.
+
+License
+-------
+
+- [MIT](LICENSE)