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# zsh(1)
## Keybindings
Change input mode:
```zsh
bindkey -v change to vi keymap
bindkey -e change to emacs keymap
```
Define key-mappings:
```zsh
bindkey list mappings in current keymap
bindkey in-str cmd create mapping for `in-str` to `cmd`
bindkey -r in-str remove binding for `in-str`
# C-v <key> dump <key> code, which can be used in `in-str`
# zle -l list all functions for keybindings
# man zshzle(1) STANDARD WIDGETS: get description of functions
```
Access edit buffer in zle widget:
```zsh
$BUFFER # Entire edit buffer content
$LBUFFER # Edit buffer content left to cursor
$RBUFFER # Edit buffer content right to cursor
# create zle widget which adds text right of the cursor
function add-text() {
RBUFFER="some text $RBUFFER"
}
zle -N add-text
bindkey "^p" add-text
```
## Parameter
Default value:
```zsh
# default value
echo ${foo:-defval} # defval
foo=bar
echo ${foo:-defval} # bar
```
Alternative value:
```zsh
echo ${foo:+altval} # ''
foo=bar
echo ${foo:+altval} # altval
```
Check variable set, error if not set:
```zsh
echo ${foo:?msg} # print `msg` and return errno `1`
foo=bar
echo ${foo:?msg} # bar
```
Sub-string `${var:offset:length}`:
```zsh
foo=abcdef
echo ${foo:1:3} # bcd
```
Trim prefix `${var#prefix}`:
```zsh
foo=bar.baz
echo ${foo#bar} # .baz
```
Trim suffix `${var%suffix}`:
```zsh
foo=bar.baz
echo ${foo%.baz} # bar
```
Substitute pattern `${var/pattern/replace}`:
```zsh
foo=aabbccbbdd
echo ${foo/bb/XX} # aaXXccbbdd
echo ${foo//bb/XX} # aaXXccXXdd
# replace prefix
echo ${foo/#bb/XX} # aabbccbbdd
echo ${foo/#aa/XX} # XXbbccbbdd
# replace suffix
echo ${foo/%bb/XX} # aabbccbbdd
echo ${foo/%dd/XX} # aabbccbbXX
```
> Note: `prefix`/`suffix`/`pattern` are expanded as pathnames.
## Variables
```zsh
# Variable with local scope
local var=val
# Read-only variable
readonly var=bal
```
Indexed arrays:
```zsh
arr=(aa bb cc dd)
echo $arr[1] # aa
echo $arr[-1] # dd
arr+=(ee)
echo $arr[-1] # ee
echo $arr[1,3] # aa bb cc
```
Associative arrays:
```zsh
typeset -A arr
arr[x]='aa'
arr[y]='bb'
echo $arr[x] # aa
```
Tied arrays:
```zsh
typeset -T VEC vec=(1 2 3) '|'
echo $vec # 1 2 3
echo $VEC # 1|2|3
```
Unique arrays (set):
```
typeset -U vec=(1 2 3)
echo $vec # 1 2 3
vec+=(1 2 4)
echo $vec # 1 2 3 4
```
### Expansion Flags
Join array to string `j:sep:`:
```zsh
foo=(1 2 3 4)
echo ${(j:-:)foo} # 1-2-3-4
echo ${(j:\n:)foo} # join with new lines
```
Split string to array `s:sep`:
```zsh
foo='1-2-3-4'
bar=(${(s:-:)foo}) # capture as array
echo $bar # 1 2 3 4
echo $bar[2] # 2
```
Upper/Lower case string:
```zsh
foo=aaBB
echo ${(L)foo} # aabb
echo ${(U)foo} # AABB
```
## Regular Expressions
Zsh supports regular expression matching with the binary operator `=~`.
The match results can be accessed via the `$MATCH` variable and
`$match` indexed array:
- `$MATCH` contains the full match
- `$match[1]` contains match of the first capture group
```zsh
INPUT='title foo : 1234'
REGEX='^title (.+) : ([0-9]+)$'
if [[ $INPUT =~ $REGEX ]]; then
echo "$MATCH" # title foo : 1234
echo "$match[1]" # foo
echo "$match[2]" # 1234
fi
```
## Completion
### Installation
Completion functions are provided via files and need to be placed in a location
covered by `$fpath`. By convention the completion files are names as `_<CMD>`.
A completion skeleton for the command `foo`, stored in `_foo`
```zsh
#compdef _foo foo
function _foo() {
...
}
```
Alternatively one can install a completion function explicitly by calling `compdef <FUNC> <CMD>`.
### Completion Variables
Following variables are available in Completion functions:
```zsh
$words # array with command line in words
$#words # number words
$CURRENT # index into $words for cursor position
$words[CURRENT-1] # previous word (relative to cursor position)
```
### Completion Functions
- `_describe` simple completion, just words + description
- `_arguments` sophisticated completion, allow to specify actions
#### Completion with [`_describe`][zsh-comp-fn]
```zsh
_describe MSG COMP
```
- `MSG` simple string with header message
- `COMP` array of completions where each entry is `"opt:description"`
```zsh
function _foo() {
local -a opts
opts=('bla:desc for bla' 'blu:desc for blu')
_describe 'foo-msg' opts
}
compdef _foo foo
foo <TAB><TAB>
-- foo-msg --
bla -- desc for bla
blu -- desc for blu
```
#### Completion with [`_arguments`][zsh-comp-fn]
```zsh
_arguments SPEC [SPEC...]
```
where `SPEC` can have one of the following forms:
- `OPT[DESC]:MSG:ACTION`
- `N:MSG:ACTION`
Available actions
```zsh
(op1 op2) list possible matches
->VAL set $state=VAL and continue, `$state` can be checked later in switch case
FUNC call func to generate matches
{STR} evaluate `STR` to generate matches
```
### Example
Skeleton to copy/paste for writing simple completions.
Assume a program `foo` with the following interface:
```zsh
foo -c green|red|blue -s low|high -f <file> -d <dir> -h
```
The completion handler could be implemented as follows in a file called `_foo`:
```zsh
#compdef _foo foo
function _foo_color() {
local colors=()
colors+=('green:green color')
colors+=('red:red color')
colors+=('blue:blue color')
_describe "color" colors
}
function _foo() {
_arguments \
"-c[define color]:color:->s_color" \
"-s[select sound]:sound:(low high)" \
"-f[select file]:file:_files" \
"-d[select dir]:dir:_files -/" \
"-h[help]"
case $state in
s_color) _foo_color;;
esac
}
```
> `_files` is a zsh builtin utility function to complete files/dirs see
> - [zsh completion functions][zsh-comp-fn]
> - [zsh completion utility functions][zsh-comp-utility-fn]
[zsh-comp-fn]: http://zsh.sourceforge.net/Doc/Release/Completion-System.html#Completion-Functions
[zsh-comp-utility-fn]: https://github.com/zsh-users/zsh-completions/blob/master/zsh-completions-howto.org#utility-functions
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