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task/docs/taskfile_versions.md
2018-10-13 18:25:40 -03:00

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# Taskfile Versions
The Taskfile syntax and features changed with time. This document explains what
changed on each version and how to upgrade your Taskfile.
## What the Taskfile version mean
The Taskfile version follows the Task version. E.g. the change to Taskfile
version `2` means that Task `v2.0.0` should be release to support it.
The `version:` key on Taskfile accepts a semver string, so either `2`, `2.0` or
`2.0.0` is accepted. You you choose to use `2.0` Task will not enable future
`2.1` features, but if you choose to use `2`, than any `2.x.x` features will be
available, but not `3.0.0+`.
## Version 1
In the first version of the `Taskfile`, the `version:` key was not available,
because the tasks was in the root of the YAML document. Like this:
```yaml
echo:
cmds:
- echo "Hello, World!"
```
The variable priority order was also different:
1. Call variables
2. Environment
3. Task variables
4. `Taskvars.yml` variables
## Version 2.0
At version 2, we introduced the `version:` key, to allow us to envolve Task
with new features without breaking existing Taskfiles. The new syntax is as
follows:
```yaml
version: '2'
tasks:
echo:
cmds:
- echo "Hello, World!"
```
Version 2 allows you to write global variables directly in the Taskfile,
if you don't want to create a `Taskvars.yml`:
```yaml
version: '2'
vars:
GREETING: Hello, World!
tasks:
greet:
cmds:
- echo "{{.GREETING}}"
```
The variable priority order changed to the following:
1. Task variables
2. Call variables
3. Taskfile variables
4. Taskvars file variables
5. Environment variables
A new global option was added to configure the number of variables expansions
(which default to 2):
```yaml
version: '2'
expansions: 3
vars:
FOO: foo
BAR: bar
BAZ: baz
FOOBAR: "{{.FOO}}{{.BAR}}"
FOOBARBAZ: "{{.FOOBAR}}{{.BAZ}}"
tasks:
default:
cmds:
- echo "{{.FOOBARBAZ}}"
```
## Version 2.1
Version 2.1 includes a global `output` option, to allow having more control
over how commands output are printed to the console
(see [documentation][output] for more info):
```yaml
version: '2'
output: prefixed
tasks:
server:
cmds:
- go run main.go
prefix: server
```
From this version it's not also possible to ignore errors of a command or task
(check documentation [here][ignore_errors]):
```yaml
version: '2'
tasks:
example-1:
cmds:
- cmd: exit 1
ignore_error: true
- echo "This will be print"
example-2:
cmds:
- exit 1
- echo "This will be print"
ignore_error: true
```
## Version 2.2
Version 2.2 comes with a global `includes` options to include other
Taskfiles:
```yaml
version: '2'
includes:
docs: ./documentation # will look for ./documentation/Taskfile.yml
docker: ./DockerTasks.yml
```
Please check the [documentation][includes]
[output]: usage#output-syntax
[ignore_errors]: usage#ignore-errors
[includes]: usage#including-other-taskfiles