doomemacs/modules/completion/helm/README.org

#+title:    :completion helm
#+subtitle: A tank for hunting a house fly
#+created:  February 20, 2017
#+since:    2.0.0

* Description :unfold:
This module provides Helm integration for a variety of Emacs commands, as well
as a unified interface for project search and replace, powered by [[https://github.com/BurntSushi/ripgrep][Ripgrep]].

** Maintainers
/This module has no dedicated maintainers./ [[doom-contrib-maintainer:][Become a maintainer?]]

** Module flags
- +childframe ::
  Display Helm windows in a [[https://www.gnu.org/software/emacs/manual/html_node/elisp/Child-Frames.html][child frame]] rather than an popup buffer. *Requires
  GUI Emacs.*
- +fuzzy ::
  Enable fuzzy completion for Helm searches.
- +icons ::
  Display icons on completion results (where possible) using either
  [[doom-package:][all-the-icons]] or [[doom-package:][treemacs]] iconsets.

** Packages
- [[doom-package:][helm]]
- [[doom-package:][helm-company]]
- [[doom-package:][helm-c-yasnippet]]
- [[doom-package:][helm-descbinds]]
- [[doom-package:][helm-describe-modes]]
- [[doom-package:][helm-flx]]* if [[doom-module:][+fuzzy]]
- [[doom-package:][helm-icons]]* if [[doom-module:][+icons]]
- [[doom-package:][helm-org]]* if [[doom-module:][:lang org]]
- [[doom-package:][helm-posframe]]* if [[doom-module:][+childframe]]
- [[doom-package:][helm-projectile]]
- [[doom-package:][helm-rg]]
- [[doom-package:][helm-swiper]]

** TODO Hacks
#+begin_quote
 🔨 This module's hacks haven't been documented yet. [[doom-contrib-module:][Document them?]]
#+end_quote

** TODO Changelog
# This section will be machine generated. Don't edit it by hand.
/This module does not have a changelog yet./

* Installation
[[id:01cffea4-3329-45e2-a892-95a384ab2338][Enable this module in your ~doom!~ block.]]

This module has only one requirement: [[https://github.com/BurntSushi/ripgrep][Ripgrep]], which is a hard dependency of
Doom itself, so you should already have it installed.

Otherwise, Helm provides many commands to interface with a variety of programs
from [[https://github.com/junegunn/fzf][fzf]] to [[https://kapeli.com/dash][Dash docsets]] to [[https://www.passwordstore.org/][pass]] and /much/ more. These programs are optional
for this module, but must be installed if you intend to use their associated
Helm command or plugin.

* TODO Usage
#+begin_quote
 🔨 /This module's usage documentation is incomplete./ [[doom-contrib-module:][Complete it?]]
#+end_quote

Much like [[doom-package:][ivy]] and [[doom-package:][vertico]], [[doom-package:][helm]] is a /large/ framework. Covering all its
features is not within the scope of this module's documentation, so only its
highlights will be covered here.

** Jump-to navigation
Similar to Ivy, this module provides an interface to navigate within a project
using [[doom-package:][projectile]]:
| Keybind          | Description                         |
|------------------+-------------------------------------|
| [[kbd:][SPC p f]], [[kbd:][SPC SPC]] | Jump to file in project             |
| [[kbd:][SPC f f]], [[kbd:][SPC .]]   | Jump to file from current directory |
| [[kbd:][SPC s i]]          | Jump to symbol in file              |

** Project search & replace
This module also provides interactive text search and replace using ripgrep.

*** Search
| Keybind | Description              |
|---------+--------------------------|
| [[kbd:][SPC s p]] | Search project           |
| [[kbd:][SPC s P]] | Search another project   |
| [[kbd:][SPC s d]] | Search this directory    |
| [[kbd:][SPC s D]] | Search another directory |

Prefixing these keys with the universal argument ([[kbd:][SPC u]] for evil users; [[kbd:][C-u]]
otherwise) changes the behavior of these commands, instructing the underlying
search engine to include ignored files.

This module also provides Ex Commands for evil users:
| Ex command             | Description                                                      |
|------------------------+------------------------------------------------------------------|
| ~:pg[rep][!] [QUERY]~  | Search project (if ~!~, include hidden files)                    |
| ~:pg[rep]d[!] [QUERY]~ | Search from current directory (if ~!~, don't search recursively) |

The optional ~!~ is equivalent to the universal argument for the previous
commands.

*** Replace
These keybindings are available while a search is active:
| Keybind | Description                                   |
|---------+-----------------------------------------------|
| [[kbd:][C-c C-o]] | Open a buffer with your search results        |
| [[kbd:][C-c C-e]] | Open a writable buffer of your search results |
| [[kbd:][C-SPC]]   | Preview the current candidate                 |
| [[kbd:][C-RET]]   | Open the selected candidate in other-window   |

Changes to the resulting wgrep buffer (opened by [[kbd:][C-c C-e]]) can be committed with
[[kbd:][C-c C-c]] and aborted with [[kbd:][C-c C-k]] (alternatively [[kbd:][ZZ]] and [[kbd:][ZQ]], for evil users).

** In-buffer searching
The [[doom-package:][swiper]] package provides an interactive buffer search powered by helm. It can
be invoked with:
- [[kbd:][SPC s s]] (~swiper-isearch~)
- [[kbd:][SPC s S]] (~swiper-isearch-thing-at-point~)
- [[kbd:][SPC s b]] (~swiper~)
- ~:sw[iper] [QUERY]~

A wgrep buffer can be opened from swiper with [[kbd:][C-c C-e]].

** Helm integration for various completing commands
Helm also has a number of overrides for built-in functionality:

*** General
| Keybind    | Description               |
|------------+---------------------------|
| [[kbd:][M-x]], [[kbd:][SPC :]] | Smarter, smex-powered M-x |
| [[kbd:][SPC ']]      | Resume last ivy session   |

*** Jump to files, buffers or projects
| Keybind          | Description                           |
|------------------+---------------------------------------|
| [[kbd:][SPC RET]]          | Find bookmark                         |
| [[kbd:][SPC f f]], [[kbd:][SPC .]]   | Browse from current directory         |
| [[kbd:][SPC p f]], [[kbd:][SPC SPC]] | Find file in project                  |
| [[kbd:][SPC f r]]          | Find recently opened file             |
| [[kbd:][SPC p p]]          | Open another project                  |
| [[kbd:][SPC b b]], [[kbd:][SPC ,]]   | Switch to buffer in current workspace |
| [[kbd:][SPC b B]], [[kbd:][SPC <]]   | Switch to buffer                      |

*** Search
| Keybind | Description                               |
|---------+-------------------------------------------|
| [[kbd:][SPC p t]] | List all TODO/FIXMEs in project           |
| [[kbd:][SPC s b]] | Search the current buffer                 |
| [[kbd:][SPC s d]] | Search this directory                     |
| [[kbd:][SPC s D]] | Search another directory                  |
| [[kbd:][SPC s i]] | Search for symbol in current buffer       |
| [[kbd:][SPC s p]] | Search project                            |
| [[kbd:][SPC s P]] | Search another project                    |
| [[kbd:][SPC s s]] | Search the current buffer (incrementally) |

* TODO Configuration
#+begin_quote
 🔨 /This module's configuration documentation is incomplete./ [[doom-contrib-module:][Complete it?]]
#+end_quote

** Icons
Icon support is now included, through one of two providers: [[doom-package:][all-the-icons]] and
[[doom-package:][treemacs]]. By default, to maintain consistency we use [[doom-package:][all-the-icons]]; however if
you wish to modify this you can do so using the below snippet:

#+begin_src emacs-lisp
(after! helm
  (setq helm-icons-provider 'treemacs))
#+end_src

** TODO Posframe

* Troubleshooting
/There are no known problems with this module./ [[doom-report:][Report one?]]

* Frequently asked questions
[[doom-suggest-faq:][Ask a question?]]

** Helm vs Ivy vs Ido vs Vertico
See [[id:4f36ae11-1da8-4624-9c30-46b764e849fc][this answer]].

* TODO Appendix
#+begin_quote
 🔨 This module has no appendix yet. [[doom-contrib-module:][Write one?]]
#+end_quote