I've recently started a Clojure gig, which has a pretty emacs-oriented language ecosystem. Emacs uses Cider and Paredit to make it super easy to:
- Move parenthesis around S-Expressions (aka 'slurping' and 'barfing')
- Access a Clojure REPL
- Surround lines, words, etc. with parenthesis, braces, brackets and quotes
Unfortunately I don't really know emacs and would rather focus on learning a language than an editor; so I set out to find vim equivalents. Wonder of wonders, I happened upon:
vim-fireplacefor dead-simple REPL functionality, jump-to-source, omni-complete, and a host of other goodies
surround.vimfor changing, adding and removing braces, parenthesis, etc
paredit.vimfor slurping and keeping parenthesis matching
Vim Fireplace is by none other than The Lord of Viml himself, Tim Pope. By
default it connects to the repl defined in
target/repl-port which makes it
pretty drop-in-and-go. Some of my favorite normal mode commands:
cpp- Evaluate the s-expression and print the results
K- Print the Clojure documentation for the symbol under the cursor
cqc- Open a mini-repl for executing arbitrary Clojure code
cqq- Open a mini-repl, with the current S-expression pre-entered
[d- Print the Clojure source for the symbol under the cursor
[C-d- Go to the definition of the symbol under the cursor
It also comes with some nice command mode helpers as well:
:A- Opens the test file for the given source file in the current buffer (and vice versa).
ATare similar but are vsplit, split, and tab respectively.
:Apropos <keyword>- Searches the current class path for symbols which match the keyword
:Eval <clojure code>- Executes arbitrary Clojure code and prints the result
Surround.vim (also by Tim Pope) is great for manipulating parenthesis, quotes, or brackets around your code. While initially designed for manipulating XML documents and swapping tags, it's definitely a handy tool for a new-found lisper. Some normal mode commands:
ys$"surrounds the current line with quotation marks I use "You're surrounded
char!" for a mnemonic for this
cs<motion><current-char><new-char>- Change Surrounding, E.g.
(foo) to [foo]
ds<char>- Deletes the surrounding character. E.g.
Paredit.vim by Tamas Kavacs was extracted from Slimv, a much broader alternative to vim-fireplace. Paredit.vim keeps your parenthesis well balanced, as well as builds in slurping and barfing for your S Expressions.
Paredit.vim is reasonably good, but if you use
\ for your
leader key you'll
want to add
let g:paredit_leader = '\' to your
Unfortunately I've found it's possible to accidentally unbalance your code,
making paredit.vim start to get in the way. The best way I've found to resolve
this is to select the offending character in visual mode and use
X to delete
it. This is because paredit does not seem to override
X in visual mode.
Overall, I'm pretty happy with this setup for now. It gives enough functionality for me to focus on Clojure instead of the editor. Admittedly, I'll probably want to pick up emacs as soon as I'm reasonably comfortable in clojure.