add compatibility flags for a bunch of scripts (part 2)

sh/dedupe

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: -ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 dedupe() ( ### @- copy a directory, but make hard/softlinks for identical files.
 # Copyright (C) 2022 Connor Olding

sh/dfu

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh YES_BB_AWK YES_OT_AWK
+# compat: -ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh YES_BB_AWK YES_OT_AWK
 
 dfu() { ### @-
     ### pretty-print `df` in GiB.
@@ -11,6 +11,8 @@ dfu() { ### @-
     ### /                      17.20   23.22    6.01    1.27
     ### ```
 
+    # FIXME: -x is not an option in busybox df.
+
     [ $# -le 0 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
     df -xtmpfs | awk '
     NR==1{printf"%-20s %7s %7s %7s %7s\n","Filesystem","Used","Max","Left","Misc"}

sh/e

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh YES_BB_AWK
+# compat: +ash +bash +dash -hush -ksh +mksh +oksh +osh +posh +yash +zsh
 
 e() { ### @-
     ### wrap around `$EDITOR` to run it as root if necessary.

sh/ea

@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 # remote file access (http file-sharing shenanigans)
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 __ea_curl() {
     curl -q --no-progress-meter 127.255.255.255 >/dev/null 2>&1

sh/echo2

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush -ksh +mksh +oksh +osh +posh +yash +zsh
 
 echo2() { ### @-
     ### print arguments joined by spaces to stderr without parsing anything.

sh/feud

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash -hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 ### @feud - parse command-line arguments, mapping short-flags to variable names.
 ### **NOTE:** the API is still experimental and will undergo major changes.

sh/ff

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 ff() { ### @-
     ### select a file from a given or current directory using

sh/ghmd

@@ -2,7 +2,7 @@
 # ghmd - format GitHub markdown
 # via: https://leahneukirchen.org/dotfiles/.zshrc
 # example: ghmd < README.md > README.html
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush -ksh +mksh +oksh +osh +posh +yash +zsh
 
 ghmd() { ### @-
     ### convert a markdown file to HTML in the style of GitHub.

sh/glug

@@ -1,5 +1,6 @@
 #!/usr/bin/env dash
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash -hush -ksh -mksh -oksh -osh -posh +yash +zsh
+# NOTE: many shells work, but some of them fail to restore tty settings.
 # fuck termcap, all my homies hate termcap.
 
 glug() ( # note the subshell syntax. this allows us to abuse globals like crazy.

sh/grab

@@ -1,5 +1,6 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: -ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
+# FIXME: `find -delete` is not POSIX (fails on busybox).
 
 __grab() { ### @grab - download a file from my site and verify its integrity by its [minisign](https://github.com/jedisct1/minisign/) signature.
 [ -z "${ZSH_VERSION}" ] || emulate sh

sh/grop

@@ -1,12 +1,12 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 # TODO: check for existence of grep -P; write a perl-based fallback.
 grop() { ### @- invoke grep with `-oP`.
     ### **NOTE:** there also exists a grop(1) program provided by
     ### the *grop* package that i don't use.
     argc $# -ge 1 grop || return
-    grep -oP -- "$@"
+    /usr/bin/env grep -oP -- "$@"
 }
 
 [ -n "${preload+-}" ] || . ~/sh/preload || exit 2

sh/grop4

@@ -1,8 +1,8 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 grop4() { ### @- [`grop`](#grop) for IPv4s.
-    grep -oP -- '(?<=^|[^\d.])((0|1\d\d|2[0-4]\d|25[0-5]|[1-9]\d?)\.((?2))\.((?2))\.((?2)))(?=$|[^\d.])'
+    /usr/bin/env grep -oP -- '(?<=^|[^\d.])((0|1\d\d|2[0-4]\d|25[0-5]|[1-9]\d?)\.((?2))\.((?2))\.((?2)))(?=$|[^\d.])'
 }
 
 [ -n "${preload+-}" ] || grop4 "$@"

sh/has

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash -hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 has() { ### @- [`have`,](#have) silently.
     if [ -z "$ZSH_VERSION" ]; then which -- "$1"; else whence -p -- "$1"; fi

sh/have

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 have() { ### @- print the result of `which` if the program is found, else simply return 1.
     ### ```

sh/hex

@@ -1,5 +1,5 @@
 #!/usr/bin/env zsh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 # though technically compatible with other shells,
 # extra functionality is through zsh's extended arithmetic functions.

sh/ify

@@ -1,5 +1,5 @@
 #!/usr/bin/sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 ify() { ### @-
     ### pipe one command through another, so you can still pass arguments to the former.

sh/is_empty

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# compat: -ash +bash -dash +zsh
+# compat: +ash +bash -dash -hush +ksh -mksh -oksh +osh -posh -yash +zsh
 
 is_empty() { ### @-
     ### return 0 if the directory given by argument is empty.

sh/isup

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush -ksh +mksh +oksh +osh +posh +yash +zsh
 
 isup() { ### @-
     ### return 0 if a given website returns a 2xx HTTP code.

sh/join2

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
 
 join2() { ### @- join every other line.
     # TODO: argc, also better interface that allows n file inputs without stdin.

sh/lsarchive

@@ -1,5 +1,5 @@
 #!/usr/bin/env zsh
-# compat: -ash -bash -dash +zsh
+# compat: -ash -bash -dash -hush -ksh -mksh -oksh -osh -posh -yash +zsh
 
 lsarchive() { ### @- list the contents of an archive file in one of many formats.
     ### borrowed from [prezto.](https://github.com/sorin-ionescu/prezto)

sh/maybesudo

@@ -1,5 +1,5 @@
 #!/usr/bin/env sh
-# compat: +ash +bash +dash +zsh
+# compat: +ash +bash +dash -hush -ksh +mksh +oksh +osh +posh +yash +zsh
 
 __maybesudo() { ### @maybesudo
     ### mimic certain features of `sudo` for systems without it installed.