dependencies, file globbing, &c about task HOT 11 CLOSED

Done. Note that I might now be leaning towards adding args anyhow... Se #31 for why.

from task.

This is currently only partially supported.

You can specify globbing in sources and generates, but Task will rerun everything once any file change.

No way to do 1-to-1 file mapping yet.

from task.

In Makefiles, this feature is not only to avoid unnecessary work, as it also allows basic templating of tasks for use with different parameters.

E.g. if we where to produce a deb package for N binaries, it would be cool if there was a way to allow for templating / task reusability.

from task.

Could a syntax like this work?

template-task:
  args:
    - FILENAME
  cmds:
    - markdown {{.FILENAME}}.md > {{.FILENAME}}.html
  sources:
    - {{.FILENAME}}.md
  generates:
    - {{.FILENAME}}.html

The template task may only be used in another task. E.g. like this:

using-template:
  cmds:
    - ^template-task FILENAME=index

A more complex usage would want to call the template-task with either a list of input parameters, or maybe even somehow retrieve this list via a glob pattern!

from task.

I guess the glob pattern could be retrieved via a dynamic variable... FILENAMES=$ls *.md | sed 's/\.md$//g'. Of course, this might make it OS specific...

UPDATE: Maybe better to do this using a Go template variable filter. Eg. a replace method supporting basic regex.

from task.

Rather adding yet-another-keyword args, I guess we could also use the existing vars, the only difference being that vars might be set when running sub-tasks? And that tasks are cached according to the variable values as well as the task name?

from task.

@smyrman I liked the idea! Yes, I would use existing vars instead of args.

Could you please open another issue for task parameters?

from task.

@smyrman Thanks

from task.

That would work but it would recompile every Markdown file any time any file in sources/*.md updated. Instead what we want is to establish that 1:1 mapping, done this way:

public/%.html: sources/%.md
	markdown $< > $@

I guess this is now possible via task parameters.

build:
  deps:
    - task: tmpl/md2html:
      vars:
        NAME: index
    - task: tmpl/md2html:
      vars:
        NAME: about
    - task: tmpl/md2html:
      vars:
        NAME: blog

tmpl/md2html:
  cmds:
    - markdown sources/{{.NAME}}.md > public/{{.NAME}}.html
  sources:
    - sources/{{.NAME}}.md
  generates:
    - public/{{.NAME}}.html

For more compact syntax, use the YAML-supported inline JSON vars: {"NAME": "index"},

UPDATE: fix typo ( use task: not cmd: as prefix when calling tasks)

from task.

Anyway, maybe the ticket could be closed?

from task.

@smyrman OK, this is partly implemented. Not completetly, since it can't automatically infer sources globs to commands like Make, but I'll close in favor of #82

from task.