From 5da8692e5224e5674086fbc15eee5da4577c07b0 Mon Sep 17 00:00:00 2001 From: johannst Date: Sat, 16 May 2020 17:25:20 +0000 Subject: deploy: 523291ed5630825f90ec944b7e7cba275d31b3f6 --- misc/fish.html | 146 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 142 insertions(+), 4 deletions(-) (limited to 'misc/fish.html') diff --git a/misc/fish.html b/misc/fish.html index ccf5a0f..1e9787e 100644 --- a/misc/fish.html +++ b/misc/fish.html @@ -149,14 +149,152 @@

fish(1)

-

keymaps

-
  Shift-Tab ........... tab-completion with search
+
Quick Info

+
Fish initialization file ~/.config/fish/config.fish

+
Switch between different key bindings:

+
    
+
  • fish_default_key_bindings to use default key bindings
    • 
+
  • fish_vi_key_bindings to use vi key bindings
    • 
+

+
Variables

+
Available scopes

+
    
+
  • local variable local to a block
    • 
+
  • global variable global to shell instance
    • 
+
  • universal variable universal to all shell instances + preserved across
+shell restart
    • 
+

+
Set/Unset Variables

+
set <name> [<values>]
+    -l  local scope
+    -g  global scope
+    -U  universal scope
+    -e  erase variable
+    -S  show verbose info
+    -x  export to ENV
+    -u  unexport from ENV
+

+
Lists

+
In fish all variables are lists (start with index 1, but lists can't
+contain lists.

+
set foo a b c d
+
+echo $foo[1]      # a
+echo $foo[-1]     # d
+echo $foo[2..3]   # b c
+echo $foo[1 3]    # a c
+

+
$ can be seen as dereference operator.

+
set foo a; set a 1337
+echo $$foo  # outputs 1337
+

+
Cartesian product.

+
echo file.{h,cc}
+# file.h file.cc
+
+echo {a,b}{1,2}
+# a1 b1 b2
+

+
Special Variables (Lists)

+
$status      # exit code of last command
+$pipestatus  # list of exit codes of pipe chain
+
+$CMD_DURATION   # runtime of last command in ms
+

+
*PATH

+
Lists ending with PATH are automatically split at : when used and joined
+with : when exported to the environment.

+
set -x BLA_PATH a:b:c:d
+echo $BLA_PATH              # a b c d
+env | grep BLA_PATH         # BLA_PATH=a:b:c:d
+

+
Command Handling

+
# sub-commands are not run in quotes
+echo "ls output: "(ls)
+

+
I/O redirection

+
# 'noclobber', fail if 'log' already exists
+echo foo >? log
+

+
Control Flow

+
if / else

+
if grep foo bar
+    # do sth
+else if grep foobar bar
+    # do sth else
+else
+    # do sth else
+end
+

+
switch

+
switch (echo foo)
+case 'foo*'
+    # do start with foo
+case bar dudel
+    # do bar and dudel
+case '*'
+    # do else
+end
+

+
while Loop

+
while true
+    echo foo
+end
+

+
for Loop

+
for f in (ls)
+    echo $f
+end
+

+
Functions

+
Function arguments are passed via $argv list.

+
function fn_foo
+    echo $argv
+end
+

+
Autoloading

+
When running a command fish attempts to autoload a function. The shell looks
+for <cmd>.fish in the locations defined by $fish_function_path and loads
+the function lazily if found.

+
This is the preferred way over monolithically defining all functions in a
+startup script.

+
Helper

+
functions         # list al functions
+functions foo     # describe function 'foo'
+functions -e foo  # erase function 'foo'
+
+funced foo        # edit function 'foo'
+                  # '-e vim' to edit in vim
+

+
Prompt

+
The prompt is defined by the output of the fish_prompt function.

+
function fish_prompt
+    set -l cmd_ret
+    echo "> "(pwd) $cmd_ret" "
+end
+

+

+
Use set_color to manipulate terminal colors.

+

+
Useful Builtins

+
# history
+history search <str>   # search history for <str>
+history merge          # merge histories from fish sessions
+
+# list
+count $var            # count elements in list
+
+# string
+string split SEP STRING
+

+
Keymaps

+
  Shift-Tab ........... tab-completion with search
   Alt-Up / Alt-Down ... search history with token under the cursor
   Alt-l ............... list content of dir under cursor
   Alt-p ............... append '2>&1 | less;' to current cmdline
 

-
debug

-
  status print-stack-trace .. prints function stacktrace (can be used in scripts)
+
Debug

+
  status print-stack-trace .. prints function stacktrace (can be used in scripts)
   breakpoint ................ halt script execution and gives shell (C-d | exit
                               to continue)
 

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