.shrc

# Generic shell initialization
# Can be sourced from .zshrc, .bashrc, .kshrc, etc.

kernel="$(uname)"

iscmd() {
	command -v "$1" >/dev/null 2>&1
}

# Add directory to PATH if it exists and isn't already in PATH.
addtopath() {
	[ ! -d $1 ] && return
	echo "$PATH" | grep ":$1$" >/dev/null && return
	echo "$PATH" | grep ":$1:" >/dev/null && return
	export PATH=$PATH:$1
}

addtopath $HOME/bin
addtopath $HOME/.local/bin
addtopath $HOME/go/bin
addtopath $HOME/.cargo/bin

if [ -d /usr/local/plan9 ]; then
	export PLAN9=/usr/local/plan9
elif [ -d $HOME/plan9 ]; then
	export PLAN9=$HOME/plan9
fi
[ ! -z "$PLAN9" ] && addtopath $PLAN9/bin

# vis text editor installs as vise in *BSD userlands because there's a vis(1)
# utility in the base system
vis_exe='vis'
if [ "$kernel" = "Darwin" ] || [ "$kernel" = "FreeBSD" ] || [ "$kernel" = "OpenBSD" ]; then
	vis_exe='vise'
	if iscmd $vis_exe; then
		alias visu='/usr/bin/vis'
		alias vis='vise'
	fi
fi

for e in nano-wrapper nano $vis_exe nvim vim vi mg jmacs godit; do
	if iscmd $e; then
		export EDITOR=$e
		export VISUAL=$e
		break
	fi
done

if iscmd fzf; then
	fzp() {
		if [ $# -lt 1 ]; then
			echo "fzp: must specify a program name" 1>&2
			return 1
		fi
		program="$1"
		shift
		"$program" "$@" $(fzf -m)
	}

	fze() {
		if [ -z "$VISUAL" ]; then
			echo "fze: cannot open editor when VISUAL is unset"
			return 1
		fi
		fzp "$VISUAL" "$@"
	}
fi

# Modified commands
if [ "$kernel" != "OpenBSD" ]; then
	alias grep='grep --color=auto'
fi
alias df='df -h'
alias du='du -h'

mkcd() {
	if [ $# -eq 0 ]; then
		echo "$0: missing operand" 1>&2
		echo "usage: $0 directory" 1>&2
		echo "mkdir and chdir into the given directory." 1>&2
		return 1
	fi
	mkdir -p "$1"
	cd "$1"
}

upcd() {
	dir=""
	for i in $(seq 1 $1); do
		dir="../$dir"
	done
	[ -z "$dir" ] && dir="$PWD"
	cd "$dir"
}

lk() {
	if ! iscmd walk; then
		echo "lk: walk must be installed" 1>&2
		return 1
	fi
	cd "$(walk "$@")"
}

# ls
if [ "$kernel" = "OpenBSD" ]; then
	alias ls='ls -hF'
else
	alias ls='ls -hF --color=auto'
fi
alias lr='ls -R' # recursive ls
alias ll='ls -l' # detailed ls
alias la='ll -A' # detailed ls, including dotfiles
if [ "$kernel" = "Linux" ]; then
	alias lx='ll -BX' # sort by extension
fi
alias lz='ll -rS' # sort by size
alias lt='ll -rt' # sort by date

# Safety features
alias cp='cp -i'
alias mv='mv -i'
if [ "$kernel" != "OpenBSD" ]; then
	alias rm='rm -I'
	alias ln='ln -i'
fi
if [ "$kernel" = "Linux" ]; then
	alias chown='chown --preserve-root'
	alias chmod='chmod --preserve-root'
	alias chgrp='chgrp --preserve-root'
fi

# Image viewing
if iscmd nsxiv; then
	alias img='nsxiv'
elif iscmd sxiv; then
	alias img='sxiv'
fi

# Screen capturing from terminal.
if iscmd maim; then
	alias screencap_desktop='maim'
	alias screencap_window='maim -st 9999999'
	alias screencap_select='maim -s'
	if iscmd xclip; then
		alias clip_png='xclip -selection clipboard -t image/png'
	fi
fi

# GNU Emacs
if iscmd emacs; then
	alias ge='emacs -nw'
	alias gec='emacsclient -n'
fi

# Shorter name for JOE's Emacs emulation
iscmd jmacs && alias jm='jmacs'

# Alias for lightweight Emacs-like editor
for e in godit-wrapper godit mg jmacs jed zile qemacs; do
	if iscmd $e; then
		alias em="$e"
		break
	fi
done

if iscmd nvim; then
	alias vi='nvim'
	alias vim='nvim'
elif iscmd vim; then
	alias vi='vim'
fi

# new vi (aka nvi aka Berkeley vi) is commonly installed as ex/vi.  Try to
# provide nex/nvi aliases for it.
if ! iscmd nex; then
	# Prefer /usr/bin/ex if it exists since on BSD that's nvi whereas
	# /usr/local/bin/ex would be vim (if installed).  On Linux, there isn't
	# a convenient and portable way of distinguishing nvi's ex from other
	# implementations (e.g., vim's or Ancient Vi's) so don't try.
	if [ -x '/usr/bin/ex' ]; then
		alias nex='/usr/bin/ex'
	elif iscmd ex; then
		alias nex='ex'
	fi
fi
! iscmd nvi && iscmd nex && alias nvi='nex -v'

if iscmd nano; then
	# invoke nano via a wrapper script
	# <https://github.com/ixtenu/script/blob/master/nano-wrapper>
	iscmd nano-wrapper && alias nano='nano-wrapper'
	# four letters is too many
	! iscmd na && alias na='nano'
fi

if iscmd sam; then
	# sam-wrapper isn't meant for plan9port sam.
	if [ -z "$PLAN9" ] || [ "$(which sam)" != "$PLAN9/bin/sam" ]; then
		# invoke sam via a wrapper script
		# <https://github.com/ixtenu/script/blob/master/sam-wrapper>
		iscmd sam-wrapper && alias sam='sam-wrapper'
	fi
fi

[ -f "$HOME/.qed/env" ] && . "$HOME/.qed/env"

# Alias helix to hx on systems which install it as helix
if iscmd helix && ! iscmd hx; then
	alias hx='helix'
fi

# textadept is much too long
iscmd textadept && ! iscmd ta && alias ta='textadept'

# allow running SciTE without typing uppercase letters
iscmd SciTE && ! iscmd scite && alias scite='SciTE'

# Debian/Ubuntu renamed fd to fdfind due to a naming conflict.
if iscmd fdfind && ! iscmd fd; then
	alias fd='fdfind'
fi

# kitty's SSH wrapper.
if iscmd kitty; then
	alias kssh='kitty +kitten ssh'
fi

# Consistent names for Sublime Text and Sublime Merge
if ! iscmd subl; then
	if iscmd sublime_text; then
		alias subl='sublime_text'
	elif iscmd subl-text; then
		alias subl='subl-text'
	elif iscmd subl4; then
		alias subl='subl4'
	fi
fi
if ! iscmd subm; then
	if iscmd sublime_merge; then
		alias subm='sublime_merge'
	elif iscmd subl-merge; then
		alias subm='subl-merge'
	elif iscmd smerge; then
		alias subm='smerge'
	fi
fi

# Alternate name for vscode
! iscmd code && iscmd code-oss && alias code='code-oss'

# Alias sudo to doas and vice versa if one is available and the other isn't.
if ! iscmd sudo && iscmd doas; then
	if [ -f /etc/doas.conf ] || [ -f /usr/local/etc/doas.conf ]; then
		alias sudo='doas'
	fi
fi
if ! iscmd doas && iscmd sudo && [ -f /etc/sudoers ]; then
	alias doas='sudo'
fi