rc/home/shrc

#!/usr/bin/env false
# for busybox ash, dash, bash, and zsh.

unset FANCY; _=: && [ -z $_ ] && FANCY=1 || FANCY=0 # detect zsh and bash
if [ "$FANCY" = 0 ]; then . ~/.prep; fi # handle stuff like /etc/profile and $PATH

# {{{1 utilities

have() { if [ -z "$ZSH_VERSION" ]; then which -- "$1"; else whence -p -- "$1"; fi; } 2>/dev/null
has() { have "$@"; } >/dev/null

has sudo && maybesudo() { sudo "$@"; } || maybesudo() { maybesudo_ "$@"; }

ADDPATH() { ### @- append a directory to `$PATH` if it isn't already present.
    [ $# = 1 ] || { printf >&2 'ADDPATH: expected exactly 1 argument, got %s\n' $#; return 64; }
    [ "$1" = "${1#[A-Z]:\\}" ] || set -- "$(cygpath -u "$1" || printf '%s\n' "$1")"
    set -- "$(readlink -f "$1")" "$1"
    if ! [ -d "$1" ]; then
        if [ -e "$1" ]; then
            printf 'ADDPATH: not a directory: %s\n' "$1" >&2
        else
            set -- "$2" "$( (true <"$2") 2>&1)"
            [ -z "$ZSH_VERSION" ] || 2="${2%: *}"
            printf 'ADDPATH: %s: %s\n' "$1" "${2##*: }" >&2
        fi
        return 1
    fi
    if [ ${#PATH} = 0 ]; then
        PATH="$1"
        return 0
    fi
    case ":$PATH:" in
        (*":$1:"*) :;;
        (*) PATH="$PATH:$1";;
    esac
}

ROPATH() {
    [ $# = 0 ] || { printf >&2 'ROPATH: expected exactly 0 arguments, got %s\n' $#; return 64; }
    local segment= previous= newpath= oldpath="$PATH:"
    while segment="${oldpath%%:*}"; [ "$segment" != "$oldpath" ]; do
        [ -z "$segment" ] || [ -z "$previous" ] || newpath="$newpath$previous:"
        [ -z "$segment" ] || previous="$segment"
        oldpath="${oldpath#*:}"
    done
    [ -z "$previous" ] || printf 'rotated %s\n' "$previous" >&2
    [ -z "$previous" ] || newpath="$previous:$newpath"
    export PATH="${newpath%:}"
}

# {{{1 configurations

umask 022 # umask should be reset else pip might make faulty installations.

if [ -d "$HOME/opt/local/bin" ]; then
    printf 'Warning: You have a %s directory\n         consider moving it to %s\n' \
      '~/opt/local/bin' '~/.local/bin' >&2
    ADDPATH "$HOME/opt/local/bin"
else
    ADDPATH "$HOME/.local/bin"
fi

# clean up problematic, potentially-inherited exports:
unset PREFIX CC CPP CXX LD CFLAGS CPPFLAGS CXXFLAGS LDFLAGS
unset AR RANLIB RC WINDRES OBJDUMP OBJCOPY
unset LD_LIBRARY_PATH
unset CDPATH # grief.

[ "$DESKTOP_SESSION" != xfce ] || export QT_QPA_PLATFORMTHEME="" # unhide menu bar
#[ "$TERM" != vt102 ] || export TERM="xterm" # PuTTY over serial
export EA_AUTH="auth"
export EA_DIR="t"
export EA_DOMAIN="https://eaguru.guru"
export EDITOR=vim
export ENV="$HOME/.shrc" # for dash and ash
export LESS='-SRQc'
export PAGER=less
export PYTHONIOENCODING=utf-8 # damnit python!
export SSH_AUTH_SOCK=0 # more info: https://0x0.st/NUnw
export TZ=':/etc/localtime' # more info: https://0x0.st/NUnv

# $LANG has been my bane whenever i forget to set it properly, so check it.
if [ "$LANG" != "en_US.UTF-8" ] && [ "$LANG" != "en_CA.UTF-8" ]; then
    if [ -z "$MSYSTEM" ] || [ "$LANG" != "C.UTF-8" ]; then
        printf 'Warning: LANG is %s\n' "${LANG:-empty!}" >&2
    fi
fi

# simple commands and aliases {{{1

refresh() ### @- invoke `hash -r`.
  { hash -r; }

pl() ### @- print each argument on its own line.
  { printf '%s\n' "$@"; }

### @ ll - list files verbosely, fancily, ordered, but not recursively.
alias ll=; unalias ll # unalias without spitting an error
if has lr; then
    ll() { lr -1lshGG -o tev "$@" | less; }
elif has lr.com; then # https://eaguru.guru/t/lr.com
    ll() { lr.com -1lshGG -o tuev "$@" | less; }
else
    ll() { ls -lAX --group-directories-first --color=force "$@" | less; }
fi

gdp() { ### @- invoke `gd` to diff a commit from its parent. the commit defaults to "HEAD".
    local commit="${1:-HEAD}"
    [ $# -le 1 ] || { printf '%s: %s\n' gdp "too many arguments" >&2; return 64; }
    gd "$commit~" "$commit"
}

gd() ### @- invoke git's diff subcommand with fewer lines of context.
  { git diff -U2 "$@"; }

rgn() ### @- invoke ripgrep without respecting `.gitignore` files.
  { rg -u "$@"; }

ryp()
  { rg -M99 -g '*.py' "$@"; }

curls() ### @- invoke curl with less noise.
  { curl -sS "$@"; }

curLs()
  { curl -L --no-progress-meter "$@"; }

ash()
  { PS1='$ ' busybox ash "$@"; }

cort()
  { LC_ALL=C sort "$@"; }

revend() ### @- reverse the 4-byte endianness of a single file. *this is an in-place operation!*
  { objcopy -I binary -O binary --reverse-bytes=4 "$@"; }

clone() ### @- invoke rsync suitably for creating virtually indistinguishable copies of files.
  { maybesudo rsync -aHA --info=progress2 --no-i-r "$@"; }

aligntabs() ### @- align tab-delimited fields in stdin.
  { column -t -s$'\t' "$@"; }

__crawl() (
    unset CDPATH && cd "${HOME:?\$HOME is unset}" || return
    [ -d .ssh ] || install -m700 -d .ssh || return # TODO: use umask instead?
    cd .ssh || return
    if ! [ -s crawl ]; then grab crawl && chmod 0600 crawl || return; fi
    exec ssh -F none -i crawl "$@"
)

crawla() ### @- play Dungeon Crawl: Stone Soup through ssh on the akrasiac server.
  { __crawl joshua@crawl.akrasiac.org "$@"; } # password is joshua

crawlz() ### @- play Dungeon Crawl: Stone Soup through ssh on the develz server.
  { __crawl crawl@crawl.develz.org "$@"; }

diff() ### @- use git's diff subcommand for general diffing.
  { git diff --color=auto --no-ext-diff --no-index --no-prefix "$@"; }

gc() ### @- columnize text by using git's column subcommand.
### **TODO:** consider renaming because gc(1) already exists.
  { git column --mode=dense --padding=2 "$@"; }

counts() ### @- count files in the current directory, including files found recursively.
  { find . | wc -l "$@"; }

exts() ### @- count and sort file extensions in the current directory, including files found recursively.
  { find -type f | grep -o '\\.[^/.]*$' | sort | uniq -c | sort -n "$@"; }

nocom() ### @- strip single-line C-like and shell-like comments.
  { grep -Ev --line-buffered --color=never "^[[:space:]]*(//|#)" "$@"; }

jrep() ### @- extract strings comprised of basic ASCII or Japanese codepoints.
  { grep -aPo "[\x{20}-\x{7E}\x{4E00}-\x{9FFF}\x{3040}-\x{30FF}]+" "$@"; }

bomb() ### @- add a Byte-Order Mark to a file.
  { uconv -f utf-8 -t utf-8 --add-signature "$@"; }

cleanse() ### @- strip unprintable and non-ASCII characters.
  { tr -cd "\11\12\15\40-\176" "$@"; }

double() ### @- print every line twice. <br/> print every line twice.
### **NOTE:** there also exists a double(1) program provided by
### the *plotutils* package that i don't use.
  { awk "{print;print}" "$@"; }

katagana() ### @- convert katakana codepoints to their equivalent hiragana.
### this is occasionally useful when translating [debug text from ancient games.](https://tcrf.net/)
  { perlu -MUnicode::Normalize -pe\''$_=NFKD($_)=~y/ァ-ヶ /ぁ-ゖ　/r''\' "$@"; }

makepkgf() ### @- make the freakin' package!
  { makepkg -Af --skipchecksums --skippgpcheck "$@"; }

rakef() ### @- make the freakin' gem!
  { rake && gem build *.gemspec && gem install *.gem "$@"; }

alias 0x0.st="oxo"
alias oshi.at="oshi"
alias pastel='pastel -f' # why would i want to use a color utility without colors?
alias rg="rg -M200"

# enable colors {{{2

if [ "$FANCY" = 1 ]; then
    # busybox is smart enough to ignore --color flags when unsupported.
    alias grep='grep --color=auto'
    alias ls='ls --color=auto'
    alias lr="lr -G"
    #alias make="$(have colormake || have make)"
fi