dadf147382
It's very often that someone will need to process values that were not provided separately (eg. generating a complex default value like in V). This commit allows the user to call the *_opt() functions instead of forcing them to provide some magical default values. * flag: Implement int_multi(), float_multi() and string_multi() These 3 functions are useful when the application expects a flag to be repeated more than once. A sample would be: v -cflags someflag -cflags secondflag This feature exposes the raw array that the flag parser internally keeps and allow the application to parse it however they want instead of dropping everything except the first element. * flag: Add documentation Add comments describing what *_opt() and *_multi() do. |
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| .github | ||
| doc | ||
| examples | ||
| thirdparty | ||
| tools | ||
| tutorials | ||
| vlib | ||
| .gitattributes | ||
| .gitignore | ||
| 0.2_roadmap.txt | ||
| BSDmakefile | ||
| CHANGELOG.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Dockerfile | ||
| Dockerfile.alpine | ||
| LICENSE | ||
| make.bat | ||
| Makefile | ||
| README.md | ||
| v.v | ||
The V Programming Language
Documentation: vlang.io/docs
Changelog: github.com/vlang/v/blob/master/CHANGELOG.md
Speed Test: fast.vlang.io (monitors compilation speed for each commit to verify there are no speed regressions)
Twitter: twitter.com/v_language
Discord (primary community): discord.gg/n7c74HM
Installing V: github.com/vlang/v#installing-v-from-source
Key Features of V
- Simplicity: the language can be learned in less than an hour
- Fast compilation: ≈100k — 1.2 million loc/s
- Easy to develop: V compiles itself in less than a second
- Performance: within 3% of C
- Safety: no null, no globals, no undefined behavior, immutability by default
- C to V translation
- Hot code reloading
- Powerful UI and graphics libraries
- Easy cross compilation
- REPL
- Built-in ORM
- C and JavaScript backends
A stable 0.2 release is planned for early December 2019. Right now V is in an alpha stage.
Installing V from source
Linux, macOS, Windows, *BSD, Solaris, WSL, Android, Raspbian
git clone https://github.com/vlang/v
cd v
make
That's it! Now you have a V executable at [path to V repo]/v. [path to V repo] can be anywhere.
(On Windows make means running make.bat, so make sure you use cmd.exe.)
V is being constantly updated. To update V, simply run:
v up
C compiler
You'll need Clang or GCC or Visual Studio. If you are doing development, you most likely already have one of those installed.
Otherwise, follow these instructions:
https://github.com/vlang/v/wiki/Installing-a-C-compiler-on-Linux-macOS
github.com/vlang/v/wiki/Installing-a-C-compiler-on-Windows
Symlinking
You can create a /usr/local/bin/v symlink so that V is globally available:
sudo ./v symlink
Docker
git clone https://github.com/vlang/v
cd v
docker build -t vlang .
docker run --rm -it vlang:latest
v
Docker with Alpine/musl:
git clone https://github.com/vlang/v
cd v
docker build -t vlang --file=Dockerfile.alpine .
docker run --rm -it vlang:latest
/usr/local/v/v
Testing and running the examples
Make sure V can compile itself:
v v.v
$ v
V 0.1.x
Use Ctrl-C or `exit` to exit
>>> println('hello world')
hello world
>>>
cd examples
v hello_world.v && ./hello_world # or simply
v run hello_world.v # this builds the program and runs it right away
v word_counter.v && ./word_counter cinderella.txt
v run news_fetcher.v
v run tetris/tetris.v
In order to build Tetris and anything else using the graphics module, you will need to install glfw and freetype libraries.
If you plan to use the http package, you also need to install OpenSSL on non-Windows systems.
macOS:
brew install glfw freetype openssl
Debian/Ubuntu:
sudo apt install libglfw3 libglfw3-dev libfreetype6-dev libssl-dev
Arch/Manjaro:
sudo pacman -S glfw-x11 freetype2
Fedora:
sudo dnf install glfw glfw-devel freetype-devel
Windows:
git clone --depth=1 https://github.com/ubawurinna/freetype-windows-binaries [path to v repo]/thirdparty/freetype/
glfw dependency will be removed soon.
Troubleshooting:
https://github.com/vlang/v/wiki/Troubleshooting
Contributing
Code structure:
https://github.com/vlang/v/blob/master/CONTRIBUTING.md
If you introduce a breaking change and rebuild V, you will no longer be able to use V to build itself. So it's a good idea to make a backup copy of a working compiler executable.