[RFA 4/4] Document in NEWS and gdb.texinfo the "help", "apropos" and "show style" changes.

[Philippe Waroquiers <philippe.waroquiers@skynet.be>]

---
 gdb/ChangeLog       |  5 +++++
 gdb/NEWS            | 30 ++++++++++++++++++++++++++
 gdb/doc/ChangeLog   |  6 ++++++
 gdb/doc/gdb.texinfo | 52 +++++++++++++++++++++++++++++++++++++++++++--
 4 files changed, 91 insertions(+), 2 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 7018c3347a..ce226c1808 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -7100,3 +7100,8 @@ End:
 	(print_help_for_command): Style the command name using title style.
 	* cli/cli-cmds.c (apropos_command): Parse optional -v flag.
 	(_initialize_cli_cmds): Describe -v in apropos_command help.
+
+2019-05-31  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
+
+	* NEWS: Mention the new set|show style [title|highlight].
+	Mention changes to "show style", "help" and "apropos".
diff --git a/gdb/NEWS b/gdb/NEWS
index ab582c036d..7e03de1b89 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -57,6 +57,36 @@ set logging debugredirect [on|off]
   By default, GDB debug output will go to both the terminal and the logfile.
   Set if you want debug output to go only to the log file.
 
+set style title foreground COLOR
+set style title background COLOR
+set style title intensity VALUE
+  Control the styling of titles.
+
+set style highlight foreground COLOR
+set style highlight background COLOR
+set style highlight intensity VALUE
+  Control the styling of highlightings.
+
+* Changed commands
+
+help
+  The "help" command uses the title style to enhance the
+  readibility of its output by styling the classes and
+  command names.
+
+apropos [-v] REGEXP
+  Similarly to "help", the "apropos" command also uses the
+  title style for the command names.  "apropos" accepts now
+  a flag "-v" (verbose) to show the full documentation
+  of matching commands and to use the highlight style to mark
+  the documentation parts matching REGEXP.
+
+show style
+  The "show style" and its subcommands are now styling
+  a style name in their output using its own style, to help
+  the user visualize the different styles.
+
+
 * New MI commands
 
 -complete
diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index c075d74eec..392569e497 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -12868,3 +12868,9 @@ fill-column: 74
 version-control: never
 coding: utf-8
 End:
+
+2019-05-31  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
+
+	* gdb.texinfo (Help): Document the new -v apropos flag.
+	(Output Styling): Document the style name styling done by "show style".
+	Document the new title and highlight styles.
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index f2d8710d7d..1a5fbff056 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -1831,10 +1831,13 @@ With a command name as @code{help} argument, @value{GDBN} displays a
 short paragraph on how to use that command.
 
 @kindex apropos
-@item apropos @var{args}
+@item apropos [-v] @var{regexp}
 The @code{apropos} command searches through all of the @value{GDBN}
 commands, and their documentation, for the regular expression specified in
-@var{args}.  It prints out all matches found.  For example:
+@var{args}.  It prints out all matches found.  The optional flag  @samp{-v},
+which stands for @samp{verbose}, indicates to output the full documentation
+of the matching commands and highlight the parts of the documentation
+matching @var{regexp}.  For example:
 
 @smallexample
 apropos alias
@@ -1853,6 +1856,29 @@ delete -- Delete some breakpoints or auto-display expressions
 @c @end group
 @end smallexample
 
+@noindent
+while
+
+@smallexample
+apropos -v cut.*thread apply
+@end smallexample
+
+@noindent
+results in the below output, where @samp{cut for 'thread apply}
+is highlighted if styling is enabled.
+
+@smallexample
+@c @group
+taas -- Apply a command to all threads (ignoring errors and empty output).
+Usage: taas COMMAND
+shortcut for 'thread apply all -s COMMAND'
+
+tfaas -- Apply a command to all frames of all threads (ignoring errors and empty output).
+Usage: tfaas COMMAND
+shortcut for 'thread apply all -s frame apply all -s COMMAND'
+@c @end group
+@end smallexample
+
 @kindex complete
 @item complete @var{args}
 The @code{complete @var{args}} command lists all the possible completions
@@ -24705,6 +24731,11 @@ Set the intensity to @var{value}.  Valid intensities are @samp{normal}
 (the default), @samp{bold}, and @samp{dim}.
 @end table
 
+The @code{show style} command and its subcommands are styling
+a style name in their output using its own style.
+So, use @command{show style} to see the complete list of styles,
+their characteristics and the visual aspect of each style.
+
 The style-able objects are:
 @table @code
 @item filename
@@ -24725,6 +24756,23 @@ foreground color is cyan.
 Control the styling of addresses.  These are managed with the
 @code{set style address} family of commands.  By default, this style's
 foreground color is blue.
+
+@item title
+Control the styling of titles.  These are managed with the
+@code{set style title} family of commands.  By default, this style's
+intensity is bold.  Commands are using the title style to improve
+the readibility of large output.  For example, the commands
+@command{apropos} and @command{help} are using the title style
+for the command names.
+
+@item highlight
+Control the styling of highlightings.  These are managed with the
+@code{set style highlight} family of commands.  By default, this style's
+foreground color is red.  Commands are using the highlight style to draw
+the user attention to some specific parts of their output.  For example,
+the command @command{apropos -v REGEXP} uses the highlight style to
+mark the documentation parts matching @var{regexp}.
+
 @end table
 
 @node Numbers
-- 
2.20.1