Updated readme

This commit is contained in:
Casey Rodarmor 2016-10-31 21:53:31 -07:00
parent ca9a0b7bff
commit cef8b4fbdf
5 changed files with 105 additions and 43 deletions

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@ -9,13 +9,13 @@ Commands are stored in a file called `justfile` with a syntax inspired by `make`
```make
test-all: build
./test --all
./test --all
test TEST: build
./test --test {{TEST}}
./test --test {{TEST}}
build:
cc *.c -o main
cc *.c -o main
```
`just` produces detailed error messages and avoids `make`'s idiosyncrasies, so debugging a justfile is easier and less suprising than debugging a makefile.
@ -44,10 +44,10 @@ Recipes look like this:
```make
recipe-name:
echo 'This is a recipe!'
echo 'This is a recipe!'
another-recipe:
@echo 'Another recipe.'
@echo 'Another recipe.'
```
Running `just` with no arguments runs the first recipe in the `justfile`:
@ -73,22 +73,22 @@ Recipes stop running if a command fails. Here `cargo publish` will only run if `
```make
publish:
cargo test
# tests passed, time to publish!
cargo publish
cargo test
# tests passed, time to publish!
cargo publish
```
Recipes can depend on other recipes. Here the `test` recipe depends on the `build` recipe, so `build` will run before `test`:
```make
build:
cc main.c foo.c bar.c -o main
cc main.c foo.c bar.c -o main
test: build:
./test
test: build
./test
sloc:
@echo "`wc -l *.c` lines of code"
@echo "`wc -l *.c` lines of code"
```
```sh
@ -123,20 +123,20 @@ tardir = "awesomesauce-" + version
tarball = tardir + ".tar.gz"
publish:
rm -f {{tarball}}
mkdir {{tardir}}
cp README.md *.c {{tardir}}
tar zcvf {{tarball}} {{tardir}}
scp {{tarball}} me@server.com:release/
rm -rf {{tarball}} {{tardir}}
rm -f {{tarball}}
mkdir {{tardir}}
cp README.md *.c {{tardir}}
tar zcvf {{tarball}} {{tardir}}
scp {{tarball}} me@server.com:release/
rm -rf {{tarball}} {{tardir}}
```
Recipes may take arguments. Here recipe `build` takes an argument called `target`:
```make
build target:
@echo 'Building {{target}}...'
cd {{target}} && make
@echo 'Building {{target}}...'
cd {{target}} && make
```
Only one recipe that takes arguments may given on the command line, and other recipes may not depend on it. To pass arguments put them after the recipe name:
@ -153,17 +153,17 @@ Variables can be exported to recipes as environment variables:
export RUST_BACKTRACE = "1"
test:
# will print a stack trace if it crashes
cargo test
# will print a stack trace if it crashes
cargo test
```
Backticks can be used to store the result of commands:
```make
localhost = `dumpinterfaces | cut -d: -f2 | sed 's/\/.*//' | sed 's/ //g'
localhost = `dumpinterfaces | cut -d: -f2 | sed 's/\/.*//' | sed 's/ //g'`
serve:
./serve {{localhost}} 8080
./serve {{localhost}} 8080
```
@ -173,25 +173,25 @@ Recipes that start with a `#!` are executed as scripts, so you can write recipes
polyglot: python js perl sh ruby
python:
#!/usr/bin/env python3
print('Hello from python!')
#!/usr/bin/env python3
print('Hello from python!')
js:
#!/usr/bin/env node
console.log('Greetings from JavaScript!')
#!/usr/bin/env node
console.log('Greetings from JavaScript!')
perl:
#!/usr/bin/env perl
print "Larry Wall says Hi!\n";
#!/usr/bin/env perl
print "Larry Wall says Hi!\n";
sh:
#!/usr/bin/env sh
hello='Yo'
echo "$hello from a shell script!"
#!/usr/bin/env sh
hello='Yo'
echo "$hello from a shell script!"
ruby:
#!/usr/bin/env ruby
puts "Hello from ruby!"
#!/usr/bin/env ruby
puts "Hello from ruby!"
```
```sh
@ -248,13 +248,26 @@ A description of the grammar of justfiles can be found in [](grammar.md).
Before `just` was a bloated rust program it was a tiny shell script. If you would rather not or can't install rust you can find the old shellscript in [](extras/just.sh). This version uses `make`, so it may not be portable across systems.
### non-project specific justfile
If you want some commands to be available everwhere, put them in `~/.justfile` and add the following to your shell's initialization file:
```sh
alias .j='just --justfile ~/.justfile --working-directory ~'
```
Or, if you'd rather they run in the current directory:
```
alias .j='just --justfile ~/.justfile --working-directory .'
```
further ramblings
-----------------
`just` is a trivial program, but I personally find it very useful to write a `justfile` for almost every project, big or small.
On a big projects with multiple contributers, it's very useful to have a file with all the commands needed to work on the project close at hand.
There are probably different commands to test, build, lint, deploy, and the like, and having them all in one place is useful and cuts down on the time you have to spend telling people which commands to run and how to type them.

4
notes
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@ -1,10 +1,6 @@
todo
----
- extract anything between ``` in readme as a justfile and make sure it parses
. alias .j='just --justfile ~/.justfile --working-directory ~'
- try to get some users
. travis
. recurse center

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@ -1,5 +1,6 @@
extern crate tempdir;
extern crate brev;
extern crate regex;
use tempdir::TempDir;
use super::std::process::Command;
@ -549,3 +550,28 @@ recipe:
"echo recipe \\\\\\\"\n",
);
}
#[test]
fn line_error_spacing() {
integration_test(
&[],
r#"
???
"#,
255,
"",
"error: unknown start of token:
|
10 | ???
| ^
",
);
}

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@ -810,11 +810,12 @@ impl<'a> Display for Error<'a> {
match self.text.lines().nth(self.line) {
Some(line) => {
let line_number_width = self.line.to_string().len();
let displayed_line = self.line + 1;
let line_number_width = displayed_line.to_string().len();
try!(write!(f, "{0:1$} |\n", "", line_number_width));
try!(write!(f, "{} | {}\n", self.line + 1, line));
try!(write!(f, "{} | {}\n", displayed_line, line));
try!(write!(f, "{0:1$} |", "", line_number_width));
try!(write!(f, " {0:1$}{2:^<3$}", "", self.column, "", self.width.unwrap_or(0)));
try!(write!(f, " {0:1$}{2:^<3$}", "", self.column, "", self.width.unwrap_or(1)));
},
None => if self.index != self.text.len() {
try!(write!(f, "internal error: Error has invalid line number: {}", self.line + 1))

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@ -1,4 +1,5 @@
extern crate tempdir;
extern crate brev;
use super::{Token, Error, ErrorKind, Justfile, RunError};
use super::TokenKind::*;
@ -805,3 +806,28 @@ fn unknown_overrides() {
other => panic!("expected an code run error, but got: {}", other),
}
}
#[test]
fn readme_test() {
let mut justfiles = vec![];
let mut current = None;
for line in brev::slurp("README.md").lines() {
if let Some(mut justfile) = current {
if line == "```" {
justfiles.push(justfile);
current = None;
} else {
justfile += line;
justfile += "\n";
current = Some(justfile);
}
} else if line == "```make" {
current = Some(String::new());
}
}
for justfile in justfiles {
parse_success(&justfile);
}
}