Removed recommendation from mhstore man page that users not put

[nmh] / man / mhshow.man

diff --git a/man/mhshow.man b/man/mhshow.man
index 7cb76cf11b780391f8e8c854e8fe3ffde60daa20..03ca5f82d1b22b53a86ea36a8d778926a48bb153 100644 (file)
--- a/man/mhshow.man
+++ b/man/mhshow.man
@@ -1,4 +1,4 @@
-.TH MHSHOW %manext1% "February 9, 2014" "%nmhversion%"
+.TH MHSHOW %manext1% "February 18, 2014" "%nmhversion%"

 .\"
 .\" %nmhwarning%
 .\"
 .\"
 .\" %nmhwarning%
 .\"


@@ -224,16 +224,17 @@ The display string may contain the following escapes:
 .PP
 .RS 5
 .nf
 .PP
 .RS 5
 .nf

-.ta \w'%F  'u
-%a     Insert parameters from Content-Type field
-%e     exclusive execution
-%f     Insert filename containing content
-%F     %e, %f, and stdin is terminal not content
-%l     display listing prior to displaying content
-%p     %l, and ask for confirmation
-%s     Insert content subtype
-%d     Insert content description
-%%     Insert the character %
+.ta \w'%F        'u
+%a        Insert parameters from Content-Type field
+%{parameter} Insert the parameter value from the Content-Type field
+%e        exclusive execution
+%f        Insert filename containing content
+%F        %e, %f, and stdin is terminal not content
+%l        display listing prior to displaying content
+%p        %l, and ask for confirmation
+%s        Insert content subtype
+%d        Insert content description
+%%        Insert the character %

 .fi
 .RE
 .PP
 .fi
 .RE
 .PP


@@ -257,6 +258,22 @@ control-\\) will tell
 .B mhshow
 to wrap things up immediately.
 .PP
 .B mhshow
 to wrap things up immediately.
 .PP

+The {parameter} escape is typically used in a command line argument
+that should only be present if it has a non-null value.  Its value
+will be wrapped with single quotes if the escape is not so wrapped.
+Shell parameter expansion can construct the argument only when it is
+non-null, e.g.,
+.PP
+.RS 5
+.nf
+mhshow-show-text/html: charset=%{charset};
+  w3m ${charset:+-I $charset} -T text/html %F
+.fi
+.RE
+.PP
+That example also shows the use of indentation to signify continuation:
+the two text lines combine to form a single entry.
+.PP

 Note that if the content being displayed is multipart, but not one of
 the subtypes listed above, then the f- and F-escapes expand to multiple
 filenames, one for each subordinate content.  Further, stdin is not
 Note that if the content being displayed is multipart, but not one of
 the subtypes listed above, then the f- and F-escapes expand to multiple
 filenames, one for each subordinate content.  Further, stdin is not


@@ -268,8 +285,8 @@ behaves as if these profile entries were supplied and supported:
 .PP
 .RS 5
 .nf
 .PP
 .RS 5
 .nf

-mhshow-show-text/plain: %pmoreproc '%F'
-mhshow-show-message/rfc822: %pshow -file '%F'
+mhshow-show-text/plain: %pmoreproc %F
+mhshow-show-message/rfc822: %pshow -file %F

 .fi
 .RE
 .PP
 .fi
 .RE
 .PP


@@ -299,14 +316,13 @@ Example entries might be:
 .RS 5
 .nf
 mhshow-show-audio/basic: raw2audio 2>/dev/null | play
 .RS 5
 .nf
 mhshow-show-audio/basic: raw2audio 2>/dev/null | play

-mhshow-show-image: xv '%f'
+mhshow-show-image: xv %f

 mhshow-show-application/PostScript: lpr -Pps
 .fi
 .RE
 .PP
 mhshow-show-application/PostScript: lpr -Pps
 .fi
 .RE
 .PP

-Note that when using the f- or F-escape, it's a good idea to use
-single-quotes around the escape.  This prevents misinterpretation by
-the shell of any funny characters that might be present in the filename.
+If an f- or F-escape is not quoted with single quotes, its expansion
+will be wrapped with single quotes.

 .PP
 Finally,
 .B mhshow
 .PP
 Finally,
 .B mhshow