feat(r-lang): add module for R programming language (#1475)

* feat(formatter): Allow scoped variables (#1094)

* feat: Allow scoped variables

, with the following improvements to the format string parser.

- Add documentation to spec
- Simplify some syntax in the spec
- Rewrite for loop with iterators

* Added support for R programming language.

* Removed unnecessary debug log used during dev process.

* Make the `R` command upper case as the *nix OS executables are case sensitives and the correct command is upper-case.

* Changed comments to reflect R features (rather than node.js where code was coming from).

* feat(format_string): Allow positional segments (#1138)

* feat(format_string): Allow using variables in a style string (#1130)

* fix(format_string): Allow multiple variable mappers (#1142)

* refactor: Add error handling to variables (#1148)

* Squashed commit of changes with meta variables:

commit 5beb3bca18f0b0c822b740afb3778ccb1e3a7d19
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Mon Apr 27 09:52:59 2020 +0800

    fix: Cache variables in meta variables properly

commit 49b9324942dd55350c87107d0e8c7d1592d92e8a
Merge: cc575bc 260a1ab
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Sun Apr 26 21:34:52 2020 +0800

    Merge branch 'feat/format-string' into meta-variables

commit cc575bc27cbf87c4197e96d2fa5416d4932e45d7
Merge: 3ed2d32 e0c1901
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Sun Apr 26 12:16:12 2020 +0800

    Merge branch 'feat/format-string' into meta-variables

commit 3ed2d326c9f625930bdd72cea736c1d0eab6d381
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Sun Apr 26 11:06:28 2020 +0800

    refactor(format_string): Allow returning error in variable mapper

commit 766732fe69
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Sat Apr 25 22:56:02 2020 +0800

    fix: Add test for StyleVariableHolder

commit 444334ad20
Merge: 479d4a7 9796a66
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Sat Apr 25 22:52:27 2020 +0800

    Merge branch 'positional-segments' into style-variables

commit 9796a66a96
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Sat Apr 25 22:51:26 2020 +0800

    test: Add tests for VariableHolder

commit 479d4a72fa
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Sat Apr 25 22:41:47 2020 +0800

    feat: Add trait StyleVariableHolder

commit 21d40c6f4e
Merge: 3b459f4 e7dd987
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Sat Apr 25 22:17:11 2020 +0800

    Merge branch 'positional-segments' into style-variables

commit e7dd987fd7
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Sat Apr 25 15:10:12 2020 +0800

    misc: Minor changes on docs and codes

commit 71020b0397
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Fri Apr 24 20:51:45 2020 +0800

    feat(format_string): Add syntax for positional segments

commit 3b459f4379
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Wed Apr 22 17:49:15 2020 +0800

    fix: Fix clippy

commit 2fb052d68c
Author: heyrict <xiezh0831@yahoo.co.jp>
Date:   Wed Apr 22 17:02:09 2020 +0800

    feat: Add map_style method to feed values in style string

* fix: Change error type of StringFormatter::new

* fix: Fix rustfmt

* tests: Add tests to variable errors

* docs: Add documentation

* chore: Rename positional to conditional (#1166)

* docs: Add docs for format strings (#1083)


Co-authored-by: Thomas O'Donnell <andytom@users.noreply.github.com>

* refactor(rust): Use format strings (#1063)

* Updated to latest string formatter's changes.

* feat(format-string): add format string support to battery module (#1158)

* update battery module with format string

* update battery module docs

* update battery module with format string

* update battery module docs

* fix battery module with new StringFormatter api

* fix clippy warnings

* Update docs/config/README.md

Co-authored-by: Zhenhui Xie <xiezh0831@yahoo.co.jp>

* battery symbols now supports format-string

* battery symbols now support format-string
remove space between symbol and percentage
fix battery config

Co-authored-by: Zhenhui Xie <xiezh0831@yahoo.co.jp>

* refactor(golang): Use format strings (#1066)

* refactor(golang): Use format strings

* docs(golang): Update docs

* docs(golang): Update docs

* fix: Update to upstream API changes

* docs(golang): Update docs

Co-authored-by: heyrict <xiezh0831@yahoo.co.jp>

* Fixed a few inconsistencies.

* Removed string clone in favor of a reference.

* Update src/modules/r.rs

Reverting the r version string formatting to a more idiomatic way of handling it.

Co-authored-by: Thomas O'Donnell <andytom@users.noreply.github.com>

* Update src/configs/r.rs

Co-authored-by: Zhenhui Xie <xiezh0831@yahoo.co.jp>

* Updated documentation to reflect changes in config.

* refactor(java): Added formatter support for Java module. (#1084)

* refactor(haskell): Added formatter support for the Haskell module. (#1111)

* Added formatter support for the Haskell module.

* Updated haskell module with latest formatter code changes.

* Changed documentation for latest Haskell string formatter changes.

* Fixed a few inconsistencies.

* Removed unnecessary variable cloning for using reference instead.

* refactor(env_var): Added formatter support for the env_var module (#1180)

* refactor(memory_usage): Added formatter support for memory_usage module (#1182)

* Migrated the memory usage module to string formatter' support.

* Fixed a few inconsistencies.

* Removed cloning of variables to instead use references.

* refactor(cmd_duration): Use format strings (#1200)

* Fixed format issue in code.

* Fixed compilation error after adding new 'r' module in root config.

* Added .Rproj extension file to be detected with R prog lang.

* Aligned R module code with existing ones.

* Update src/configs/r.rs

Co-authored-by: David Knaack <davidkna@users.noreply.github.com>

* fix: Added rconfig to fullconfig and fixed broken api calls

* Apply suggestions from code review

Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>

* Update src/modules/r.rs

Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>

* Addressed PR comments.

Cleaned up code and fixed code errors.

* Updated docs for consistency purpose.

Co-authored-by: Milo <50248166+Milo123459@users.noreply.github.com>

* refactor: Renamed the `r` module to `rlang`

* test: Provided R fixture and R module renderer test

* doc: Updated rlang mod config to reflect latest detection changes

* fix: Added missing rlang entry in config/mod

* feat: Added version formatted fined grained configuration

* Added version_format in R lang documentation.

Co-authored-by: David Knaack <davidkna@users.noreply.github.com>

* review: Addressed later comments

* fix: README was missing a previously present section for Python

* Fix: Test was not updated for previous version string upgrade.

* fix: Upgraded R version in remaining test.

Co-authored-by: Zhenhui Xie <xiezh0831@yahoo.co.jp>
Co-authored-by: Thomas O'Donnell <andytom@users.noreply.github.com>
Co-authored-by: Luca Rinaldi <lucarin@protonmail.com>
Co-authored-by: John Letey <johnletey@gmail.com>
Co-authored-by: Tilmann Meyer <47182955+ATiltedTree@users.noreply.github.com>
Co-authored-by: David Knaack <davidkna@users.noreply.github.com>
Co-authored-by: Dario Vladović <d.vladimyr@gmail.com>
Co-authored-by: Milo <50248166+Milo123459@users.noreply.github.com>

src/configs/mod.rs

@@ -47,6 +47,7 @@ pub mod php;
 pub mod purescript;
 pub mod python;
 pub mod red;
+pub mod rlang;
 pub mod ruby;
 pub mod rust;
 pub mod scala;
@@ -117,6 +118,7 @@ pub struct FullConfig<'a> {
     php: php::PhpConfig<'a>,
     purescript: purescript::PureScriptConfig<'a>,
     python: python::PythonConfig<'a>,
+    rlang: rlang::RLangConfig<'a>,
     red: red::RedConfig<'a>,
     ruby: ruby::RubyConfig<'a>,
     rust: rust::RustConfig<'a>,
@@ -186,6 +188,7 @@ impl<'a> Default for FullConfig<'a> {
             purescript: Default::default(),
             python: Default::default(),
             red: Default::default(),
+            rlang: Default::default(),
             ruby: Default::default(),
             rust: Default::default(),
             scala: Default::default(),