divert(-1)changequote([,])

# LOUD alert for unsuspecting users (note: `donte' is not a word from the dictionary)
define([DONTE], [DO NOT EDIT! This file is generated automatically!])

# a left/right unpaired symbol bypassing the non-terminal control
define([LB], [changequote[dnl]
changequote([,])])
define([RB], [changequote`'dnl[
]changequote([,])])

# number of arguments (loops)
define([NAR], [$#])

# expands n-th argument (use Vim shortcuts Ctrl-a or Ctrl-x to change ARGn)
define([ARG1],	[$1])
define([ARG2],	[$2])
define([ARG3],	[$3])

# selects n-th argument
define([SARG1],	[[$1]])
define([SARG2],	[[$2]])
define([SARG3],	[[$3]])

# another universal pair of symbols that protects unwanted expansion (intentionally: `paYr')
define([PAYR], [[$@]])

# another layer of paired symbols (if the control pairs are changed)
define([BRAC], [[$@]])
define([NPRI], [$@])
define([QUOT], [`$@'])
define([UTFP], [⟦$@⟧])

# prints warning to stderr if something will be problematic
define([ROOT_WARNING], [errprint(__file__:__line__[: warning: $1
])])

# aborts script if something goes wrong, prints the reason to stderr
define([ROOT_ERROR], [errprint(__file__:__line__[: error: $1
])m4exit(1)])