docs for completion_prv

content/en/docs/commands.md

@@ -30,6 +30,32 @@ After ensuring all dependencies are available, and fetching them if they are not
 | ---------------- | ---- | ---------------------------------------------------------|
 | `-d/--deps_only` | none | Only compile dependencies, no project apps will be built |
 
+## completion
+{{% blocks/callout type="info" title="Since version 3.23.0" %}}
+{{< /blocks/callout >}}
+Generates a completion file for one of the supported shells: `bash`, `zsh`.
+
+Completion files can be generated based on the project setup, so autocompletion also works for all plugins used in the project, not just for default providers.
+
+To use generated completion files run `source path/to/generated/file`.
+
+| Option | Type | Description |
+| ------- | ------- | --------- |
+| `-a/--aliases` | Comma separated list of strings | OS level aliases on which rebar3 completion will be triggered (e.g. `"rebar, r3"`) |
+| `-f/--file` | string | Completion file name. If not absolute, it's relative to the `_build/<profile>/` directory |
+| `-s/--shell` | atom | Specify type of the completion file. By default it is autodected using `$SHELL` variable. Valid values are `bash` and `zsh`.
+
+{{% blocks/callout type="warning" title="zsh specific requirement" %}}
+Make sure that `autoload -Uz compinit; compinit` is called in `.zshrc` file.
+{{< /blocks/callout >}}
+
+For better user experience, set default autocompletion and override it when needed.
+Default autocompletion can be set by generating a global completion file and loading it in `.bashrc` or `.zshrc`.
+
+To generate a global (project-independent) completion file run `rebar3 completion --file path/to/global/completion/file` outside a `rebar3` project. 
+
+
+
 ## clean
 
 Removes compiled BEAM files from apps.

content/en/docs/configuration/configuration.md

@@ -191,6 +191,17 @@ Disable recursive compiling on test and other dirs:
 }.
 ```
 
+## Completion 
+
+```erlang
+{completion,
+    [{aliases,["rebar", "r3"]},
+     {file, "/home/user/completion/_rebar3"},
+     {shell, bash}]}.
+``` 
+
+Options mirror those specified in [Commands](/docs/commands#completion) arguments.
+
 ## Common Test
 
 ```erlang
@@ -203,7 +214,7 @@ Reference of common test options for `ct_opts`: [https://www.erlang.org/doc/man/
 
 A special option allows to load a default `sys.config` set of entries using `{ct_opts, [{sys_config, ["name.of.config"]}]}`. From the command line, it is however specified as `--sys_config name.of.config`.
 
-Options often exist mirroring those that can be specified in [Commands](/docs/commands) arguments.
+Options often exist mirroring those that can be specified in [Commands](/docs/commands/#ct) arguments.
 
 ## Cover