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Document the command_chain option

This commit is contained in:
w0rp 2017-02-09 09:42:17 +00:00
parent bf2075cd0c
commit 73e0f87eba
1 changed files with 34 additions and 3 deletions
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doc/ale.txt
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@ -1005,15 +1005,40 @@ ale#linter#Define(filetype, linter) *ale#linter#Define()*
check, and will produce the lines of output given to
the `callback`.
Either this or the `command_callback` argument must
be provided.
`command_callback` A |String| or |Funcref| for a callback function
accepting a buffer number. A |String| should be
returned for a command to run. This can be used in
place of `command` when more complicated processing
is needed.
`command_chain` A |List| of |Dictionary| items defining a series
of commands to be run. At least one |Dictionary|
should be provided. Each Dictionary must contain the
key `callback`, defining a |String| or |Funcref| for
a function returning a |String| for a command to run.
The callback functions for each command after the
first command in in the chain should accept two
arguments `(buffer, output)`, a buffer number and a
|List| of lines of output from the previous command
in the chain.
The first callback function in a chain accepts only
a `(buffer)` argument, as there are no previous
commands to run which return `output`.
Commands in the chain will all use the
`output_stream` value provided in the root
|Dictionary|. Each command in the chain can also
provide an `output_stream` key to override this value.
See the `output_stream` description for more
information.
The Vim buffer being checked for linter will only
be sent to the final command in the chain. Previous
commands in the chain will receive no input from
stdin.
`output_stream` A |String| for the output stream the lines of output
should be read from for the command which is run. The
accepted values are `'stdout'`, `'stderr'`, and
@ -1023,6 +1048,12 @@ ale#linter#Define(filetype, linter) *ale#linter#Define()*
instead of stdout. The option `'both'` will read
from both stder and stdout at the same time.
Only one of `command`, `command_callback`, or `command_chain` should be
specified. `command_callback` is generally recommended when a command string
needs to be generated dynamically, or any global options are used.
`command_chain` is recommended where any system calls need to be made to
retrieve some kind of information before running the final command.
Some programs for checking for errors are not capable of receiving input
from stdin, as is required by ALE. To remedy this, a wrapper script is
provided named in the variable |g:ale#util#stdin_wrapper|. This variable