=Bashrc=

Source: https://git.thurstylark.com/vcsh/bashrc.git

----

==Prompt==

I originally built my prompt using http://bashrcgenerator.com and, while it's a nice tool for visually building a prompt, it has several limitations on what you're able to create with it. But more importantly to me, it generates a rediculously long string, defines and resets color for every single character, uses both a color and bold escape sequence to use light/bright colors, mixes raw escape sequences and subshells running tput, and as a result is utterly unreadable and unmaintainable.

So, I replaced it:

{{{class="prettyprint"
### PROMPT ###

promptsetup() {
	# Color definitions for prompt
	local fg_brightred='\[$(tput setaf 9)\]'
	local fg_blue='\[$(tput setaf 4)\]'
	local fg_magenta='\[$(tput setaf 13)\]'
	local fg_cyan='\[$(tput setaf 6)\]'
	local fg_brightcyan='\[$(tput setaf 14)\]'
	local reset='\[$(tput sgr0)\]'

	# [hh:mm][username@hostname pwd]$
	if [ -n "$SSH_CLIENT" ]; then
		# Remotely, hostname is red.
		PS1="${fg_blue}[\A]${fg_cyan}[${fg_brightcyan}\u${fg_cyan}@${fg_brightred}\h ${fg_cyan}\W]${reset}\$ "

	elif [ -n "$VCSH_REPO_NAME" ]; then
		# If in a vcsh repo env, add repo name in magenta.
		PS1="${fg_blue}[\A]${fg_cyan}[${fg_brightcyan}\u${fg_cyan}@\h ${fg_magenta}$VCSH_REPO_NAME ${fg_cyan}\W]${reset}\$ "

	else
		# Locally, hostname is cyan.
		PS1="${fg_blue}[\A]${fg_cyan}[${fg_brightcyan}\u${fg_cyan}@\h \W]${reset}\$ "
	fi
}

promptsetup
}}}

I intentionally put everything in a function and call it immediately so I may use local vars for the color definitions. I didn't really want to leave them around just in case. 

----

==Profile==

Bash chooses which dotfile to source based on how it gets run. If starting from a login shell, `~/.bash_profile` will get sourced, but if there's not a command in there to source your `~/.bashrc`, you may find yourself having to `exec bash` after starting bash. This can be fixed by adding the following line to your `~/.bash_profile`:

{{{class="prettyprint"
[[ -f ~/.bashrc ]] && . ~/.bashrc
}}}

I also use `~/.bash_profile` for setting numlock while in a tty:

{{{class="prettyprint"
case $(tty) in /dev/tty[0-9]*)
	setleds -D +num # (numlock for X is set in ~/.xinitrc)
	;;
esac
}}}

The last thing of note in my `~/.bash_profile` is a warning:

{{{class="prettyprint"
	# Temporary fix for a systemd bug related to systemd --user timers that run on login
	[[ -z "$DBUS_SESSION_BUS_ADDRESS" ]] && printf "%bWARNING: \$DBUS_SESSION_BUS_ADDRESS is unset! %b\n" "$(tput bold)$(tput setab 1)" "$(tput sgr0)"
}}}

----

==Weechat==

The alias portion of my [[Weechat]] configuration is set in the .bashrc like so:

{{{class="prettyprint"
# If you don't have weechat installed, connect to the existing tmux session through mosh
[[ ! -s /usr/bin/weechat ]] && alias weechat='mosh vps -- tmux attach -dt weechat'
# If you are thurstylark-vps, connect to the existing tmux session locally
[[ "$HOSTNAME" = "thurstylark-vps" ]] && alias weechat='tmux attach -dt weechat'
}}}

For more info, see the [[Weechat]] page.

----

==Get Dell Service Tag==

I work with Dell machines a lot, and when dealing with hardware problems, it's nice to have the service tag handy. Lucky for me, the service tag is easily retrieveable using `dmidecode(1)`, so I made a function for it.

{{{class="prettyprint"
# Print Dell Service Tag
getdst() {
        if [[ "$1" = "-l" ]]; then
                printf "http://www.dell.com/support/home/us/en/04/product-support/servicetag/%s\n" "$(getdst)"
        else
                sudo dmidecode -s system-serial-number
        fi
}
}}}

As an added bonus, the `-l` option will print the url for that product's support page.

----

==Screenshot==

This function wraps `maim(1)` and `fb(1)` to simplify my most used options. It uses maim to capture either the full screen, the active window, or a mouse selection to a file, or directly to a pastebin.

{{{class="prettyprint"
# Screenshot utils
shot() {
	# Usage: shot XY
	local destdir="$HOME/Pictures/screenshots"
	local fname="shot-$(date +%F-%T).png"
	local pb="fb"
	local paste msgt msgd opts

	if [ -z "$1" ]; then
		printf "Usage: shot XY
X: Target
Y: Destination

Valid Targets:
w	Active Window
a	All displays
s	Mouse Selection

Valid Destinations:
f	Save to file (defined in function)
p	Upload to a pastebin (defined in function)
"
		return
	fi

	# X: What to capture
	case ${1:0:1} in
		# Active window
		w) 	printf "Focus target window now...\n"
			opts="-i $(xdotool getactivewindow)"
			msgt="active window"
			;;
		# All
		a)	msgt="all displays"
			;;
		# Mouse selection
		s) 	opts="-s --noopengl"
			msgt="mouse selection"
			;;

		*)	printf "Unknown target: %s\n" "${1:0:1}"
			return
			;;
	esac

	#Y: Where to put the result
	case ${1:1:1} in
		# Save to file
		f)	msgd="file: $destdir/$fname"
			;;
		# Post to a pastebin
		p)	destdir=$destdir/pasted
			msgd="pastebin"
			paste=1;;

		*)	printf "Unknown destination: %s\n" "${1:1:1}"
			return
			;;
	esac

	# Make sure destination directory will exist
	[[ ! -d "$destdir" ]] && mkdir -p "$destdir"
	local fpath="${destdir}/${fname}"
	# If target is active window, give a 5 second countdown before running maim
	[[ "$msgt" = "active window" ]] && countdown 5

	maim $opts "$fpath"
	printf "Captured %s -> %s\n" "$msgt" "$msgd"
	# If destination is a pastebin, do the needful
	[[ "$paste" ]] && $pb "$fpath"
}
}}}

This probably isn't the most robust solution, but it works pretty well. Patches welcome.


----

==Countdown==

Found this little function when I wanted to add functionality to `shot()`. It takes an integer as an argument, then counts down that number of seconds visually.

{{{class="prettyprint"
countdown() {
	local secs="$1"
	while [ $secs -gt 0 ]; do
		echo -ne "$secs\033[0K\r"
		sleep 1
		: $((secs--))
	done
}
}}}

This probably isn't the sanest or safest solution to the problem, but it gets the job done. Patches welcome.

----

==FontFind==

Sometimes you just need to figure out what font provides a specific character. This function provides that solution:

{{{class="prettyprint"
fontfind() {
	if [[ -z $1 || ${#1} -gt 1 ]]; then
		printf "E: only one character accepted"
	fi
	local glyph=$1
	FC_DEBUG=4 pango-view -qt "$glyph" 2>&1 | awk -F \" '/family: / { m = $2 } END { print m }'
}
}}}

----

==Vactivate==

I started needing more than one python virtualenv, and I wanted easy access to my own specific file structure. Additionally, I wanted the ability to deactivate the venv like I would exit a child shell. This is the solution that I came up with:

{{{class="prettyprint"
vactivate() {
	local path=~/.venv/$1

	if [[ ! -d $path ]]; then
		python -m venv $path --prompt "venv: $1"
	fi
	source $path/bin/activate; bash; deactivate
}
}}}

A caveat to this is that the prompt modification that venv usually applies is not available using this method. If a prompt modification is desired, it needs to be taken care of elsewhere.