In the validators, translate obsolete macro aliases (Lp, Ot, LP, P)

[mandoc.git] / mandoc.1

diff --git a/mandoc.1 b/mandoc.1
index 5d59ba4f5379c2685e04c72c1da1305e5d6f05bb..240003573f96bb447b3bacf39e23daa0c096a537 100644 (file)
--- a/mandoc.1
+++ b/mandoc.1
@@ -1,7 +1,7 @@
-.\"    $Id: mandoc.1,v 1.209 2017/06/29 15:22:17 schwarze Exp $
+.\"    $Id: mandoc.1,v 1.231 2018/11/22 11:30:23 schwarze Exp $

 .\"
 .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"
 .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>

-.\" Copyright (c) 2012, 2014-2017 Ingo Schwarze <schwarze@openbsd.org>
+.\" Copyright (c) 2012, 2014-2018 Ingo Schwarze <schwarze@openbsd.org>

 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above
 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above


@@ -15,7 +15,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"

-.Dd $Mdocdate: June 29 2017 $
+.Dd $Mdocdate: November 22 2018 $

 .Dt MANDOC 1
 .Os
 .Sh NAME
 .Dt MANDOC 1
 .Os
 .Sh NAME


@@ -34,9 +34,7 @@
 .Sh DESCRIPTION
 The
 .Nm
 .Sh DESCRIPTION
 The
 .Nm

-utility formats
-.Ux
-manual pages for display.
+utility formats manual pages for display.

 .Pp
 By default,
 .Nm
 .Pp
 By default,
 .Nm


@@ -118,7 +116,7 @@ With
 all input files are interpreted as
 .Xr man 7 .
 By default, the input language is automatically detected for each file:
 all input files are interpreted as
 .Xr man 7 .
 By default, the input language is automatically detected for each file:

-if the the first macro is
+if the first macro is

 .Ic \&Dd
 or
 .Ic \&Dt ,
 .Ic \&Dd
 or
 .Ic \&Dt ,


@@ -132,13 +130,32 @@ With other arguments,
 is silently ignored.
 .It Fl O Ar options
 Comma-separated output options.
 is silently ignored.
 .It Fl O Ar options
 Comma-separated output options.

+See the descriptions of the individual output formats for supported
+.Ar options .

 .It Fl T Ar output
 .It Fl T Ar output

-Output format.
-See
-.Sx Output Formats
-for available formats.
-Defaults to
-.Fl T Cm locale .
+Select the output format.
+Supported values for the
+.Ar output
+argument are
+.Cm ascii ,
+.Cm html ,
+the default of
+.Cm locale ,
+.Cm man ,
+.Cm markdown ,
+.Cm pdf ,
+.Cm ps ,
+.Cm tree ,
+and
+.Cm utf8 .
+.Pp
+The special
+.Fl T Cm lint
+mode only parses the input and produces no output.
+It implies
+.Fl W Cm all
+and redirects parser messages, which usually appear on standard
+error output, to standard output.

 .It Fl W Ar level
 Specify the minimum message
 .Ar level
 .It Fl W Ar level
 Specify the minimum message
 .Ar level


@@ -196,11 +213,11 @@ and
 are requested, they can be joined with a comma, for example
 .Fl W Cm error , Ns Cm stop .
 .It Ar file
 are requested, they can be joined with a comma, for example
 .Fl W Cm error , Ns Cm stop .
 .It Ar file

-Read input from zero or more files.
-If unspecified, reads from stdin.
-If multiple files are specified,
+Read from the given input file.
+If multiple files are specified, they are processed in the given order.
+If unspecified,

 .Nm
 .Nm

-will halt with the first failed parse.
+reads from standard input.

 .El
 .Pp
 The options
 .El
 .Pp
 The options


@@ -220,67 +237,14 @@ manual.
 The options
 .Fl fkl
 are mutually exclusive and override each other.
 The options
 .Fl fkl
 are mutually exclusive and override each other.

-.Ss Output Formats
-The
-.Nm
-utility accepts the following
-.Fl T
-arguments, which correspond to output modes:
-.Bl -tag -width "-T markdown"
-.It Fl T Cm ascii
-Produce 7-bit ASCII output.
-See
-.Sx ASCII Output .
-.It Fl T Cm html
-Produce HTML5, CSS1, and MathML output.
-See
-.Sx HTML Output .
-.It Fl T Cm lint
-Parse only: produce no output.
-Implies
-.Fl W Cm all .
-.It Fl T Cm locale
-Encode output using the current locale.
-This is the default.
-See
-.Sx Locale Output .
-.It Fl T Cm man
-Produce
-.Xr man 7
-format output.
-See
-.Sx Man Output .
-.It Fl T Cm markdown
-Produce output in
-.Sy markdown
-format.
-See
-.Sx Markdown Output .
-.It Fl T Cm pdf
-Produce PDF output.
-See
-.Sx PDF Output .
-.It Fl T Cm ps
-Produce PostScript output.
-See
-.Sx PostScript Output .
-.It Fl T Cm tree
-Produce an indented parse tree.
-See
-.Sx Syntax tree output .
-.It Fl T Cm utf8
-Encode output in the UTF\-8 multi-byte format.
-See
-.Sx UTF\-8 Output .
-.El
-.Pp
-If multiple input files are specified, these will be processed by the
-corresponding filter in-order.

 .Ss ASCII Output
 .Ss ASCII Output

-Output produced by
+Use

 .Fl T Cm ascii
 .Fl T Cm ascii

-is rendered in standard 7-bit ASCII documented in
-.Xr ascii 7 .
+to force text output in 7-bit ASCII character encoding documented in the
+.Xr ascii 7
+manual page, ignoring the
+.Xr locale 1
+set in the environment.

 .Pp
 Font styles are applied by using back-spaced encoding such that an
 underlined character
 .Pp
 Font styles are applied by using back-spaced encoding such that an
 underlined character


@@ -297,9 +261,6 @@ The special characters documented in
 .Xr mandoc_char 7
 are rendered best-effort in an ASCII equivalent.
 .Pp
 .Xr mandoc_char 7
 are rendered best-effort in an ASCII equivalent.
 .Pp

-Output width is limited to 78 visible columns unless literal input lines
-exceed this limit.
-.Pp

 The following
 .Fl O
 arguments are accepted:
 The following
 .Fl O
 arguments are accepted:


@@ -313,9 +274,42 @@ and seven for
 .Xr man 7 .
 Increasing this is not recommended; it may result in degraded formatting,
 for example overfull lines or ugly line breaks.
 .Xr man 7 .
 Increasing this is not recommended; it may result in degraded formatting,
 for example overfull lines or ugly line breaks.

+When output is to a pager on a terminal that is less than 66 columns
+wide, the default is reduced to three columns.
+.It Cm mdoc
+Format
+.Xr man 7
+input files in
+.Xr mdoc 7
+output style.
+Specifically, this suppresses the two additional blank lines near the
+top and the bottom of each page, and it implies
+.Fl O Cm indent Ns =5 .
+One useful application is for checking that
+.Fl T Cm man
+output formats in the same way as the
+.Xr mdoc 7
+source it was generated from.
+.It Cm tag Ns Op = Ns Ar term
+If the formatted manual page is opened in a pager,
+go to the definition of the
+.Ar term
+rather than showing the manual page from the beginning.
+If no
+.Ar term
+is specified, reuse the first command line argument that is not a
+.Ar section
+number.
+This is useful when it is the name of a manual page,
+in particular the name of a library function.

 .It Cm width Ns = Ns Ar width
 The output width is set to
 .It Cm width Ns = Ns Ar width
 The output width is set to

-.Ar width .
+.Ar width
+instead of the default of 78.
+When output is to a pager on a terminal that is less than 79 columns
+wide, the default is reduced to one less than the terminal width.
+In any case, lines that are output in literal mode are never wrapped
+and may exceed the output width.

 .El
 .Ss HTML Output
 Output produced by
 .El
 .Ss HTML Output
 Output produced by


@@ -336,7 +330,8 @@ defaults to simple output (via an embedded style-sheet)
 readable in any graphical or text-based web
 browser.
 .Pp
 readable in any graphical or text-based web
 browser.
 .Pp

-Special characters are rendered in decimal-encoded UTF\-8.
+Non-ASCII characters are rendered
+as hexadecimal Unicode character references.

 .Pp
 The following
 .Fl O
 .Pp
 The following
 .Fl O


@@ -362,7 +357,7 @@ Instances of
 are replaced with the include filename.
 The default is not to present a
 hyperlink.
 are replaced with the include filename.
 The default is not to present a
 hyperlink.

-.It Cm man Ns = Ns Ar fmt
+.It Cm man Ns = Ns Ar fmt Ns Op ; Ns Ar fmt

 The string
 .Ar fmt ,
 for example,
 The string
 .Ar fmt ,
 for example,


@@ -378,27 +373,43 @@ are replaced with the linked manual's name and section, respectively.
 If no section is included, section 1 is assumed.
 The default is not to
 present a hyperlink.
 If no section is included, section 1 is assumed.
 The default is not to
 present a hyperlink.

+If two formats are given and a file
+.Ar %N.%S
+exists in the current directory, the first format is used;
+otherwise, the second format is used.

 .It Cm style Ns = Ns Ar style.css
 The file
 .Ar style.css
 is used for an external style-sheet.
 This must be a valid absolute or
 relative URI.
 .It Cm style Ns = Ns Ar style.css
 The file
 .Ar style.css
 is used for an external style-sheet.
 This must be a valid absolute or
 relative URI.

+.It Cm toc
+If an input file contains at least two non-standard sections,
+print a table of contents near the beginning of the output.

 .El
 .Ss Locale Output
 .El
 .Ss Locale Output

-Locale-depending output encoding is triggered with
+By default,
+.Nm
+automatically selects UTF-8 or ASCII output according to the current
+.Xr locale 1 .
+If any of the environment variables
+.Ev LC_ALL ,
+.Ev LC_CTYPE ,
+or
+.Ev LANG
+are set and the first one that is set
+selects the UTF-8 character encoding, it produces
+.Sx UTF-8 Output ;
+otherwise, it falls back to
+.Sx ASCII Output .
+This output mode can also be selected explicitly with

 .Fl T Cm locale .
 .Fl T Cm locale .

-This is the default.
-.Pp
-This option is not available on all systems: systems without locale
-support, or those whose internal representation is not natively UCS-4,
-will fall back to
-.Fl T Cm ascii .
-See
-.Sx ASCII Output
-for font style specification and available command-line arguments.

 .Ss Man Output
 .Ss Man Output

-Translate input format into
+Use
+.Fl T Cm man
+to translate
+.Xr mdoc 7
+input into

 .Xr man 7
 output format.
 This is useful for distributing manual sources to legacy systems
 .Xr man 7
 output format.
 This is useful for distributing manual sources to legacy systems


@@ -406,11 +417,7 @@ lacking
 .Xr mdoc 7
 formatters.
 .Pp
 .Xr mdoc 7
 formatters.
 .Pp

-If
-.Xr mdoc 7
-is passed as input, it is translated into
-.Xr man 7 .
-If the input format is
+If the input format of a file is

 .Xr man 7 ,
 the input is copied to the output, expanding any
 .Xr roff 7
 .Xr man 7 ,
 the input is copied to the output, expanding any
 .Xr roff 7


@@ -422,11 +429,11 @@ level controls which
 .Sx DIAGNOSTICS
 are displayed before copying the input to the output.
 .Ss Markdown Output
 .Sx DIAGNOSTICS
 are displayed before copying the input to the output.
 .Ss Markdown Output

-Translate
+Use
+.Fl T Cm markdown
+to translate

 .Xr mdoc 7
 .Xr mdoc 7

-input to the
-.Sy markdown
-format conforming to
+input to the markdown format conforming to

 .Lk http://daringfireball.net/projects/markdown/syntax.text\
  "John Gruber's 2004 specification" .
 The output also almost conforms to the
 .Lk http://daringfireball.net/projects/markdown/syntax.text\
  "John Gruber's 2004 specification" .
 The output also almost conforms to the


@@ -497,13 +504,24 @@ If an unknown value is encountered,
 .Ar letter
 is used.
 .El
 .Ar letter
 is used.
 .El

-.Ss UTF\-8 Output
+.Ss UTF-8 Output

 Use
 .Fl T Cm utf8
 Use
 .Fl T Cm utf8

-to force a UTF\-8 locale.
+to force text output in UTF-8 multi-byte character encoding,
+ignoring the
+.Xr locale 1
+settings in the environment.

 See
 See

-.Sx Locale Output
-for details and options.
+.Sx ASCII Output
+regarding font styles and
+.Fl O
+arguments.
+.Pp
+On operating systems lacking locale or wide character support, and
+on those where the internal character representation is not UCS-4,
+.Nm
+always falls back to
+.Sx ASCII Output .

 .Ss Syntax tree output
 Use
 .Fl T Cm tree
 .Ss Syntax tree output
 Use
 .Fl T Cm tree


@@ -572,6 +590,13 @@ Meta data is not available in this case.
 .El
 .Sh ENVIRONMENT
 .Bl -tag -width MANPAGER
 .El
 .Sh ENVIRONMENT
 .Bl -tag -width MANPAGER

+.It Ev LC_CTYPE
+The character encoding
+.Xr locale 1 .
+When
+.Sx Locale Output
+is selected, it decides whether to use ASCII or UTF-8 output format.
+It never affects the interpretation of input files.

 .It Ev MANPAGER
 Any non-empty value of the environment variable
 .Ev MANPAGER
 .It Ev MANPAGER
 Any non-empty value of the environment variable
 .Ev MANPAGER


@@ -719,32 +744,13 @@ so using GNU troff instead of
 .Nm
 to process the file may be preferable.
 .It Cm error
 .Nm
 to process the file may be preferable.
 .It Cm error

-An input file contains invalid syntax that cannot be safely interpreted.
-By discarding part of the input or inserting missing tokens,
-the parser is able to continue, and the error does not prevent
-generation of formatted output, but typically, preparing that
-output involves information loss, broken document structure
-or unintended formatting, no matter whether
-.Nm
-or GNU troff is used.
-In many cases, the output of
-.Nm
-and GNU troff is identical, but in some,
-.Nm
-is more resilient than GNU troff with respect to malformed input.
-.Pp
-Non-existent or unreadable input files are also reported on the
-.Cm error
-level.
-In that case, the parser cannot even be started and no output
-is produced from those input files.
+Indicates a risk of information loss or severe misformatting,
+in most cases caused by serious syntax errors.

 .It Cm warning
 .It Cm warning

-An input file uses obsolete, discouraged or non-portable syntax.
-All the same, the meaning of the input is unambiguous and a correct
-rendering can be produced.
-Documents causing warnings may render poorly when using other
-formatting tools instead of
-.Nm .
+Indicates a risk that the information shown or its formatting
+may mismatch the author's intent in minor ways.
+Additionally, syntax errors are classified at least as warnings,
+even if they do not usually cause misformatting.

 .It Cm style
 An input file uses dubious or discouraged style.
 This is not a complaint about the syntax, and probably neither
 .It Cm style
 An input file uses dubious or discouraged style.
 This is not a complaint about the syntax, and probably neither


@@ -758,10 +764,16 @@ Please use your good judgement to decide whether any particular
 .Cm style
 suggestion really justifies a change to the input file.
 .It Cm base
 .Cm style
 suggestion really justifies a change to the input file.
 .It Cm base

-A convertion used in the base system of a specific operating system
+A convention used in the base system of a specific operating system

 is not adhered to.
 These are not markup mistakes, and neither the quality of formatting
 nor portability are in danger.
 is not adhered to.
 These are not markup mistakes, and neither the quality of formatting
 nor portability are in danger.

+Messages of the
+.Cm base
+level are printed with the more intuitive
+.Cm style
+.Ar level
+tag.

 .El
 .Pp
 Messages of the
 .El
 .Pp
 Messages of the


@@ -836,6 +848,14 @@ generated by CVS
 or
 .Ic NetBSD
 keyword substitution as conventionally used in these operating systems.
 or
 .Ic NetBSD
 keyword substitution as conventionally used in these operating systems.

+.It Sy "referenced manual not found"
+.Pq mdoc
+An
+.Ic \&Xr
+macro references a manual page that is not found in the base system.
+The path to look for base system manuals is configurable at compile
+time and defaults to
+.Pa /usr/share/man : /usr/X11R6/man .

 .El
 .Ss Style suggestions
 .Bl -ohang
 .El
 .Ss Style suggestions
 .Bl -ohang


@@ -852,16 +872,41 @@ Consider using the conventional
 date format
 .Dq "Month dd, yyyy"
 instead.
 date format
 .Dq "Month dd, yyyy"
 instead.

+.It Sy "normalizing date format to" : No ...
+.Pq mdoc , man
+The
+.Ic \&Dd
+or
+.Ic \&TH
+macro provides an abbreviated month name or a day number with a
+leading zero.
+In the formatted output, the month name is written out in full
+and the leading zero is omitted.
+.It Sy "lower case character in document title"
+.Pq mdoc , man
+The title is still used as given in the
+.Ic \&Dt
+or
+.Ic \&TH
+macro.

 .It Sy "duplicate RCS id"
 A single manual page contains two copies of the RCS identifier for
 the same operating system.
 Consider deleting the later instance and moving the first one up
 to the top of the page.
 .It Sy "duplicate RCS id"
 A single manual page contains two copies of the RCS identifier for
 the same operating system.
 Consider deleting the later instance and moving the first one up
 to the top of the page.

-.It Sy "typo in section name"
+.It Sy "possible typo in section name"

 .Pq mdoc
 Fuzzy string matching revealed that the argument of an
 .Ic \&Sh
 macro is similar, but not identical to a standard section name.
 .Pq mdoc
 Fuzzy string matching revealed that the argument of an
 .Ic \&Sh
 macro is similar, but not identical to a standard section name.

+.It Sy "unterminated quoted argument"
+.Pq roff
+Macro arguments can be enclosed in double quote characters
+such that space characters and macro names contained in the quoted
+argument need not be escaped.
+The closing quote of the last argument of a macro can be omitted.
+However, omitting it is not recommended because it makes the code
+harder to read.

 .It Sy "useless macro"
 .Pq mdoc
 A
 .It Sy "useless macro"
 .Pq mdoc
 A


@@ -897,17 +942,41 @@ list contains two consecutive
 entries describing the same
 .Ic \&Er
 number.
 entries describing the same
 .Ic \&Er
 number.

-.It Sy "description line ends with a full stop"
+.It Sy "trailing delimiter"

 .Pq mdoc
 .Pq mdoc

-Do not use punctuation at the end of an
-.Ic \&Nd
-block.
+The last argument of an
+.Ic \&Ex , \&Fo , \&Nd , \&Nm , \&Os , \&Sh , \&Ss , \&St ,
+or
+.Ic \&Sx
+macro ends with a trailing delimiter.
+This is usually bad style and often indicates typos.
+Most likely, the delimiter can be removed.

 .It Sy "no blank before trailing delimiter"
 .Pq mdoc
 The last argument of a macro that supports trailing delimiter
 arguments is longer than one byte and ends with a trailing delimiter.
 Consider inserting a blank such that the delimiter becomes a separate
 argument, thus moving it out of the scope of the macro.
 .It Sy "no blank before trailing delimiter"
 .Pq mdoc
 The last argument of a macro that supports trailing delimiter
 arguments is longer than one byte and ends with a trailing delimiter.
 Consider inserting a blank such that the delimiter becomes a separate
 argument, thus moving it out of the scope of the macro.

+.It Sy "fill mode already enabled, skipping"
+.Pq man
+A
+.Ic \&fi
+request occurs even though the document is still in fill mode,
+or already switched back to fill mode.
+It has no effect.
+.It Sy "fill mode already disabled, skipping"
+.Pq man
+An
+.Ic \&nf
+request occurs even though the document already switched to no-fill mode
+and did not switch back to fill mode yet.
+It has no effect.
+.It Sy "verbatim \(dq--\(dq, maybe consider using \e(em"
+.Pq mdoc
+Even though the ASCII output device renders an em-dash as
+.Qq \-\- ,
+that is not a good way to write it in an input file
+because it renders poorly on all other output devices.

 .It Sy "function name without markup"
 .Pq mdoc
 A word followed by an empty pair of parentheses occurs on a text line.
 .It Sy "function name without markup"
 .Pq mdoc
 A word followed by an empty pair of parentheses occurs on a text line.


@@ -916,6 +985,18 @@ Consider using an
 or
 .Ic \&Xr
 macro.
 or
 .Ic \&Xr
 macro.

+.It Sy "whitespace at end of input line"
+.Pq mdoc , man , roff
+Whitespace at the end of input lines is almost never semantically
+significant \(em but in the odd case where it might be, it is
+extremely confusing when reviewing and maintaining documents.
+.It Sy "bad comment style"
+.Pq roff
+Comment lines start with a dot, a backslash, and a double-quote character.
+The
+.Nm
+utility treats the line as a comment line even without the backslash,
+but leaving out the backslash might not be portable.

 .El
 .Ss Warnings related to the document prologue
 .Bl -ohang
 .El
 .Ss Warnings related to the document prologue
 .Bl -ohang


@@ -931,13 +1012,6 @@ macro before the first non-prologue macro.
 There is no
 .Ic \&TH
 macro, or it has no arguments.
 There is no
 .Ic \&TH
 macro, or it has no arguments.

-.It Sy "lower case character in document title"
-.Pq mdoc , man
-The title is still used as given in the
-.Ic \&Dt
-or
-.Ic \&TH
-macro.

 .It Sy "missing manual section, using \(dq\(dq"
 .Pq mdoc , man
 A
 .It Sy "missing manual section, using \(dq\(dq"
 .Pq mdoc , man
 A


@@ -973,13 +1047,17 @@ The date given in a
 or
 .Ic \&TH
 macro does not follow the conventional format.
 or
 .Ic \&TH
 macro does not follow the conventional format.

+.It Sy "date in the future, using it anyway"
+.Pq mdoc , man
+The date given in a
+.Ic \&Dd
+or
+.Ic \&TH
+macro is more than a day ahead of the current system
+.Xr time 3 .

 .It Sy "missing Os macro, using \(dq\(dq"
 .Pq mdoc
 The default or current system is not shown in this case.
 .It Sy "missing Os macro, using \(dq\(dq"
 .Pq mdoc
 The default or current system is not shown in this case.

-.It Sy "duplicate prologue macro"
-.Pq mdoc
-One of the prologue macros occurs more than once.
-The last instance overrides all previous ones.

 .It Sy "late prologue macro"
 .Pq mdoc
 A
 .It Sy "late prologue macro"
 .Pq mdoc
 A


@@ -987,17 +1065,6 @@ A
 or
 .Ic \&Os
 macro occurs after some non-prologue macro, but still takes effect.
 or
 .Ic \&Os
 macro occurs after some non-prologue macro, but still takes effect.

-.It Sy "skipping late title macro"
-.Pq mdoc
-The
-.Ic \&Dt
-macro appears after the first non-prologue macro.
-Traditional formatters cannot handle this because
-they write the page header before parsing the document body.
-Even though this technical restriction does not apply to
-.Nm ,
-traditional semantics is preserved.
-The late macro is discarded including its arguments.

 .It Sy "prologue macros out of order"
 .Pq mdoc
 The prologue macros are not given in the conventional order
 .It Sy "prologue macros out of order"
 .Pq mdoc
 The prologue macros are not given in the conventional order


@@ -1089,6 +1156,24 @@ The same standard section title occurs more than once.
 .Pq mdoc
 A standard section header occurs in a section of the manual
 where it normally isn't useful.
 .Pq mdoc
 A standard section header occurs in a section of the manual
 where it normally isn't useful.

+.It Sy "cross reference to self"
+.Pq mdoc
+An
+.Ic \&Xr
+macro refers to a name and section matching the section of the present
+manual page and a name mentioned in an
+.Ic \&Nm
+macro in the NAME or SYNOPSIS section, or in an
+.Ic \&Fn
+or
+.Ic \&Fo
+macro in the SYNOPSIS.
+Consider using
+.Ic \&Nm
+or
+.Ic \&Fn
+instead of
+.Ic \&Xr .

 .It Sy "unusual Xr order"
 .Pq mdoc
 In the SEE ALSO section, an
 .It Sy "unusual Xr order"
 .Pq mdoc
 In the SEE ALSO section, an


@@ -1224,20 +1309,6 @@ Inside a
 list, a
 .Ic \&Ta
 macro occurs as the first macro on a line, which is not portable.
 list, a
 .Ic \&Ta
 macro occurs as the first macro on a line, which is not portable.

-.It Sy "fill mode already enabled, skipping"
-.Pq man
-A
-.Ic \&fi
-request occurs even though the document is still in fill mode,
-or already switched back to fill mode.
-It has no effect.
-.It Sy "fill mode already disabled, skipping"
-.Pq man
-An
-.Ic \&nf
-request occurs even though the document already switched to no-fill mode
-and did not switch back to fill mode yet.
-It has no effect.

 .It Sy "line scope broken"
 .Pq man
 While parsing the next-line scope of the previous macro,
 .It Sy "line scope broken"
 .Pq man
 While parsing the next-line scope of the previous macro,


@@ -1451,14 +1522,6 @@ An empty box is inserted.
 .El
 .Ss "Warnings related to bad macro arguments"
 .Bl -ohang
 .El
 .Ss "Warnings related to bad macro arguments"
 .Bl -ohang

-.It Sy "unterminated quoted argument"
-.Pq roff
-Macro arguments can be enclosed in double quote characters
-such that space characters and macro names contained in the quoted
-argument need not be escaped.
-The closing quote of the last argument of a macro can be omitted.
-However, omitting it is not recommended because it makes the code
-harder to read.

 .It Sy "duplicate argument"
 .Pq mdoc
 A
 .It Sy "duplicate argument"
 .Pq mdoc
 A


@@ -1562,6 +1625,12 @@ or
 .Cm off .
 The invalid argument is moved out of the macro, which leaves the macro
 empty, causing it to toggle the spacing mode.
 .Cm off .
 The invalid argument is moved out of the macro, which leaves the macro
 empty, causing it to toggle the spacing mode.

+.It Sy "argument contains two font escapes"
+.Pq roff
+The second argument of a
+.Ic char
+request contains more than one font escape sequence.
+A wrong font may remain active after using the character.

 .It Sy "unknown font, skipping request"
 .Pq man , tbl
 A
 .It Sy "unknown font, skipping request"
 .Pq man , tbl
 A


@@ -1600,22 +1669,10 @@ As an implementation dependent choice, tab characters on text lines
 are passed through to the formatters in any case.
 Given that the text before the tab character will be filled,
 it is hard to predict which tab stop position the tab will advance to.
 are passed through to the formatters in any case.
 Given that the text before the tab character will be filled,
 it is hard to predict which tab stop position the tab will advance to.

-.It Sy "whitespace at end of input line"
-.Pq mdoc , man , roff
-Whitespace at the end of input lines is almost never semantically
-significant \(em but in the odd case where it might be, it is
-extremely confusing when reviewing and maintaining documents.

 .It Sy "new sentence, new line"
 .Pq mdoc
 A new sentence starts in the middle of a text line.
 Start it on a new input line to help formatters produce correct spacing.
 .It Sy "new sentence, new line"
 .Pq mdoc
 A new sentence starts in the middle of a text line.
 Start it on a new input line to help formatters produce correct spacing.

-.It Sy "bad comment style"
-.Pq roff
-Comment lines start with a dot, a backslash, and a double-quote character.
-The
-.Nm
-utility treats the line as a comment line even without the backslash,
-but leaving out the backslash might not be portable.

 .It Sy "invalid escape sequence"
 .Pq roff
 An escape sequence has an invalid opening argument delimiter, lacks the
 .It Sy "invalid escape sequence"
 .Pq roff
 An escape sequence has an invalid opening argument delimiter, lacks the


@@ -1722,6 +1779,21 @@ and any remaining cells stay empty.
 .El
 .Ss "Errors related to roff, mdoc, and man code"
 .Bl -ohang
 .El
 .Ss "Errors related to roff, mdoc, and man code"
 .Bl -ohang

+.It Sy "duplicate prologue macro"
+.Pq mdoc
+One of the prologue macros occurs more than once.
+The last instance overrides all previous ones.
+.It Sy "skipping late title macro"
+.Pq mdoc
+The
+.Ic \&Dt
+macro appears after the first non-prologue macro.
+Traditional formatters cannot handle this because
+they write the page header before parsing the document body.
+Even though this technical restriction does not apply to
+.Nm ,
+traditional semantics is preserved.
+The late macro is discarded including its arguments.

 .It Sy "input stack limit exceeded, infinite loop?"
 .Pq roff
 Explicit recursion limits are implemented for the following features,
 .It Sy "input stack limit exceeded, infinite loop?"
 .Pq roff
 Explicit recursion limits are implemented for the following features,


@@ -1760,6 +1832,13 @@ or
 macro.
 It may be mistyped or unsupported.
 The request or macro is discarded including its arguments.
 macro.
 It may be mistyped or unsupported.
 The request or macro is discarded including its arguments.

+.It Sy "skipping request outside macro"
+.Pq roff
+A
+.Ic shift
+or
+.Ic return
+request occurs outside any macro definition and has no effect.

 .It Sy "skipping insecure request"
 .Pq roff
 An input file attempted to run a shell command
 .It Sy "skipping insecure request"
 .Pq roff
 An input file attempted to run a shell command


@@ -1869,6 +1948,14 @@ When parsing for a request or a user-defined macro name to be called,
 only the escape sequence is discarded.
 The characters preceding it are used as the request or macro name,
 the characters following it are used as the arguments to the request or macro.
 only the escape sequence is discarded.
 The characters preceding it are used as the request or macro name,
 the characters following it are used as the arguments to the request or macro.

+.It Sy "using macro argument outside macro"
+.Pq roff
+The escape sequence \e$ occurs outside any macro definition
+and expands to the empty string.
+.It Sy "argument number is not numeric"
+.Pq roff
+The argument of the escape sequence \e$ is not a digit;
+the escape sequence expands to the empty string.

 .It Sy "NOT IMPLEMENTED: Bd -file"
 .Pq mdoc
 For security reasons, the
 .It Sy "NOT IMPLEMENTED: Bd -file"
 .Pq mdoc
 For security reasons, the


@@ -1897,6 +1984,13 @@ macro fails to specify the list type.
 The argument of a
 .Ic \&ce
 request is not a number.
 The argument of a
 .Ic \&ce
 request is not a number.

+.It Sy "argument is not a character"
+.Pq roff
+The first argument of a
+.Ic char
+request is neither a single ASCII character
+nor a single character escape sequence.
+The request is ignored including all its arguments.

 .It Sy "missing manual name, using \(dq\(dq"
 .Pq mdoc
 The first call to
 .It Sy "missing manual name, using \(dq\(dq"
 .Pq mdoc
 The first call to


@@ -1931,6 +2025,13 @@ or
 .Ic \&gsize
 statement has a non-numeric or negative argument or no argument at all.
 The invalid request or statement is ignored.
 .Ic \&gsize
 statement has a non-numeric or negative argument or no argument at all.
 The invalid request or statement is ignored.

+.It Sy "excessive shift"
+.Pq roff
+The argument of a
+.Ic shift
+request is larger than the number of arguments of the macro that is
+currently being executed.
+All macro arguments are deleted and \en(.$ is set to zero.

 .It Sy "NOT IMPLEMENTED: .so with absolute path or \(dq..\(dq"
 .Pq roff
 For security reasons,
 .It Sy "NOT IMPLEMENTED: .so with absolute path or \(dq..\(dq"
 .Pq roff
 For security reasons,