Add BUILD.md

BUILD.md

+Building fzf
+============
+
+Build instructions
+------------------
+
+### Prerequisites
+
+- `go` executable in $PATH
+
+### Using Makefile
+
+Makefile will set up and use its own `$GOPATH` under the project root.
+
+```sh
+# Source files are located in src directory
+cd src
+
+# Build fzf binary for your platform in src/fzf
+make
+
+# Build fzf binary and copy it to bin directory
+make install
+
+# Build 32-bit and 64-bit executables and tarballs
+make release
+
+# Build executables and tarballs for Linux using Docker
+make linux
+```
+
+### Using `go get`
+
+Alternatively, you can build fzf directly with `go get` command without
+cloning the repository.
+
+```sh
+go get -u github.com/junegunn/fzf/src/fzf
+```
+
+Build options
+-------------
+
+### With ncurses 6
+
+The official binaries of fzf are built with ncurses 5 because it's widely
+supported by different platforms. However ncurses 5 is old and has a number of
+limitations.
+
+1. Does not support more than 256 color pairs (See [357][357])
+2. Does not support italics
+3. Does not support 24-bit color
+
+[357]: https://github.com/junegunn/fzf/issues/357
+
+But you can manually build fzf with ncurses 6 to overcome some of these
+limitations. ncurses 6 supports up to 32767 color pairs (1), and supports
+italics (2). To build fzf with ncurses 6, you have to install it first. On
+macOS, you can use Homebrew to install it.
+
+```sh
+brew install homebrew/dupes/ncurses
+LDFLAGS="-L/usr/local/opt/ncurses/lib" make install
+```
+
+### With tcell
+
+[tcell][tcell] is a portable alternative to ncurses and we currently use it to
+build Windows binaries. tcell has many benefits but most importantly, it
+supports 24-bit colors. To build fzf with tcell:
+
+```sh
+TAGS=tcell make install
+```
+
+However, note that tcell has its own issues.
+
+- Poor rendering performance compared to ncurses
+- Does not support bracketed-paste mode
+- Does not support italics unlike ncurses 6
+- Some wide characters are not correctly displayed
+
+Third-party libraries used
+--------------------------
+
+- [ncurses][ncurses]
+- [mattn/go-runewidth](https://github.com/mattn/go-runewidth)
+    - Licensed under [MIT](http://mattn.mit-license.org)
+- [mattn/go-shellwords](https://github.com/mattn/go-shellwords)
+    - Licensed under [MIT](http://mattn.mit-license.org)
+- [mattn/go-isatty](https://github.com/mattn/go-isatty)
+    - Licensed under [MIT](http://mattn.mit-license.org)
+- [tcell](https://github.com/gdamore/tcell)
+    - Licensed under [Apache License 2.0](https://github.com/gdamore/tcell/blob/master/LICENSE)
+
+License
+-------
+
+[MIT](LICENSE)
+
+[install]: https://github.com/junegunn/fzf#installation
+[go]:      https://golang.org/
+[gil]:     http://en.wikipedia.org/wiki/Global_Interpreter_Lock
+[ncurses]: https://www.gnu.org/software/ncurses/
+[req]:     http://golang.org/doc/install
+[tcell]:   https://github.com/gdamore/tcell

CHANGELOG.md

@@ -14,7 +14,7 @@ CHANGELOG
         - Supports italics
     - *tcell*
         - 24-bit color support
-    - See https://github.com/junegunn/fzf/blob/master/src/README.md#build
+    - See https://github.com/junegunn/fzf/blob/master/BUILD.md
 
 0.15.8
 ------

README.md

@@ -91,6 +91,11 @@ flawlessly.
 
 [wsl]: https://blogs.msdn.microsoft.com/wsl/
 
+Building fzf
+------------
+
+See [BUILD.md](BUILD.md).
+
 Usage
 -----
 

src/README.md

@@ -50,55 +50,7 @@ starts much faster though the difference may not be noticeable.
 Build
 -----
 
-```sh
-# Build fzf executables and tarballs
-make release
-
-# Install the executable to ../bin directory
-make install
-
-# Build executables and tarballs for Linux using Docker
-make linux
-```
-
-### With ncurses 6
-
-The official binaries of fzf are built with ncurses 5 because it's widely
-supported by different platforms. However ncurses 5 is old and has a number of
-limitations.
-
-1. Does not support more than 256 color pairs (See [357][357])
-2. Does not support italics
-3. Does not support 24-bit color
-
-[357]: https://github.com/junegunn/fzf/issues/357
-
-But you can manually build fzf with ncurses 6 to overcome some of these
-limitations. ncurses 6 supports up to 32767 color pairs (1), and supports
-italics (2). To build fzf with ncurses 6, you have to install it first. On
-macOS, you can use Homebrew to install it.
-
-```sh
-brew install homebrew/dupes/ncurses
-LDFLAGS="-L/usr/local/opt/ncurses/lib" make install
-```
-
-### With tcell
-
-[tcell][tcell] is a portable alternative to ncurses and we currently use it to
-build Windows binaries. tcell has many benefits but most importantly, it
-supports 24-bit colors. To build fzf with tcell:
-
-```sh
-TAGS=tcell make install
-```
-
-However, note that tcell has its own issues.
-
-- Poor rendering performance compared to ncurses
-- Does not support bracketed-paste mode
-- Does not support italics unlike ncurses 6
-- Some wide characters are not correctly displayed
+See [BUILD.md](../BUILD.md)
 
 Test
 ----