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My custom fish prompt code explained at
function _common_section
printf $c1
printf $argv[1]
printf $c0
printf ":"
printf $c2
printf $argv[2]
printf $argv[3]
printf $c0
printf ", "
function section
_common_section $argv[1] $c3 $argv[2] $ce
function error
_common_section $argv[1] $ce $argv[2] $ce
function fish_prompt
# $status gets nuked as soon as something else is run, e.g. set_color
# so it has to be saved asap.
set -l last_status $status
# c0 to c4 progress from dark to bright
# ce is the error colour
set -g c0 (set_color 005284)
set -g c1 (set_color 0075cd)
set -g c2 (set_color 009eff)
set -g c3 (set_color 6dc7ff)
set -g c4 (set_color ffffff)
set -g ce (set_color $fish_color_error)
# Clear the line because fish seems to emit the prompt twice. The initial
# display, then when you press enter.
printf "\033[K"
# Current time
printf (date "+$c2%H$c0:$c2%M$c0:$c2%S, ")
if [ $last_status -ne 0 ]
error last $last_status
set -ge status
# Track the last non-empty command. It's a bit of a hack to make sure
# execution time and last command is tracked correctly.
set -l cmd_line (commandline)
if test -n "$cmd_line"
set -g last_cmd_line $cmd_line
set -ge new_prompt
set -g new_prompt true
# Show last execution time and growl notify if it took long enough
set -l now (date +%s)
if test $last_exec_timestamp
set -l taken (math $now - $last_exec_timestamp)
if test $taken -gt 10 -a -n "$new_prompt"
error taken $taken
echo "Returned $last_status, took $taken seconds" | \
growlnotify -s $last_cmd_line
# Clear the last_cmd_line so pressing enter doesn't repeat
set -ge last_cmd_line
set -g last_exec_timestamp $now
# Show loadavg when too high
set -l load1m (uptime | grep -o '[0-9]\+\.[0-9]\+' | head -n1)
set -l load1m_test (math $load1m \* 100 / 1)
if test $load1m_test -gt 100
error load $load1m
# Show disk usage when low
set -l du (df / | tail -n1 | sed "s/ */ /g" | cut -d' ' -f 5 | cut -d'%' -f1)
if test $du -gt 80
error du $du%%
# Virtual Env
if set -q VIRTUAL_ENV
section env (basename "$VIRTUAL_ENV")
# Git branch and dirty files
if set -q git_branch
set out $git_branch
if test $git_dirty_count -gt 0
set out "$out$c0:$ce$git_dirty_count"
section git $out
# Current Directory
# 1st sed for colourising forward slashes
# 2nd sed for colourising the deepest path (the 'm' is the last char in the
# ANSI colour code that needs to be stripped)
printf $c1
printf (pwd | sed "s,/,$c0/$c1,g" | sed "s,\(.*\)/[^m]*m,\1/$c3,")
# Prompt on a new line
printf $c4
printf "\n> "

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@rohitkrishna094 rohitkrishna094 commented Nov 24, 2019

Hey just curious, I have some questions.

  1. What is git_branch? is it an alias that you have? For me, its saying that git_branch is not found.
  2. Also just curious, what is this language called? Is it bash? or is it fish? Do you know any good site for learning the syntax of this scripting language?



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@gak gak commented Nov 26, 2019

Hi @rohitkrishna094

I used fish 6 years ago and have been back to zsh since. Sorry, I don't remember question 1, but IIRC the scripting language is fish.


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@rseichter rseichter commented Sep 3, 2020

Just as you would write bash functions using bash syntax, fish scripts are written using fish syntax. 😉

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