General

Evaluate a piece of elisp code

You can type the form in the scratch buffer, and then type LFD (or C-j) after it. The result of evaluating the form will be inserted in the buffer.

Typing M-: or M-x eval-expression allows you to type a Lisp form in the minibuffer which will be evaluated once you press RET.

Emacs manual

enable / disable tabs instead of spaces on a buffer

set indent-tab-mode to t to enable tabs.

Tabs vs Spaces

Major modes

Markdown mode

markdown mode

Table editing

C-c UP or C-c DOWN - Move the current row up or down.
C-c LEFT or C-c RIGHT - Move the current column left or right.
C-c S-UP - Kill the current row.
C-c S-DOWN - Insert a row above the current row. With a prefix argument, row line is created below the current one.
C-c S-LEFT - Kill the current column.
C-c S-RIGHT - Insert a new column to the left of the current one.

Spacemacs

Reinstall packages

remove packages under elpa/ directory and restart emacs.

Key binds

list processes of Emacs subprocesses M-m a p (list-processes)
Key bindings conventions

LSP

remove blacklist
```
M-x lsp-workspace-blacklist-remove
```

Metals

Bloop with gradle

Add gradle-bloop plugin. e.g. on build.gradle.kts

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies { classpath("ch.epfl.scala:gradle-bloop_2.12:1.6.0") }
}

apply(plugin = "bloop")

Export build (done by metals)
```
$ ./gradlew bloopInstall
```
Verify installation and export
```
$ bloop projects
```
Reference
- Bloop with Gradle

Log location

${project_home}/.metals/metals.log

Reinstall metals

Delete .cache/lsp/metals/ and install server again.

Clangd

Project setup

cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=1

Emacs for Mac

Trouble shooting

Too many open files

This problem cannot be simply solved by increasing ulimit because

Emacs uses pselect, which is limited to FD_SETSIZE file descriptors, usually 1024.

It requires to build Emacs to change FD_SETSIZE.

lsp-mode tends to consume many file descriptors for file watching. file-notify-rm-all-watches can be used to free up descriptors as a workaound.

reference: Fix annoying max open files for Emacs

Links

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