patch 8.1.2004: more functions can be used as methods

Problem:    More functions can be used as methods.
Solution:   Make various functions usable as a method.

runtime/doc/eval.txt

@@ -8895,7 +8895,11 @@ sound_playevent({name} [, {callback}])
 
 		Returns the sound ID, which can be passed to `sound_stop()`.
 		Returns zero if the sound could not be played.
-		{only available when compiled with the |+sound| feature}
+
+		Can also be used as a |method|: >
+			GetSoundName()->sound_playevent()
+
+<		{only available when compiled with the |+sound| feature}
 
 							*sound_playfile()*
 sound_playfile({path} [, {callback}])
@@ -8903,6 +8907,10 @@ sound_playfile({path} [, {callback}])
 		must be a full path.  On Ubuntu you may find files to play
 		with this command: >
 		    :!find /usr/share/sounds -type f | grep -v index.theme
+
+<		Can also be used as a |method|: >
+			GetSoundPath()->sound_playfile()
+
 <		{only available when compiled with the |+sound| feature}
 
 
@@ -8913,7 +8921,10 @@ sound_stop({id})					*sound_stop()*
 		On MS-Windows, this does not work for event sound started by
 		`sound_playevent()`. To stop event sounds, use `sound_clear()`.
 
-		{only available when compiled with the |+sound| feature}
+		Can also be used as a |method|: >
+			soundid->sound_stop()
+
+<		{only available when compiled with the |+sound| feature}
 
 							*soundfold()*
 soundfold({word})
@@ -8924,6 +8935,9 @@ soundfold({word})
 		This can be used for making spelling suggestions.  Note that
 		the method can be quite slow.
 
+		Can also be used as a |method|: >
+			GetWord()->soundfold()
+<
 							*spellbadword()*
 spellbadword([{sentence}])
 		Without argument: The result is the badly spelled word under
@@ -8950,6 +8964,9 @@ spellbadword([{sentence}])
 		'spell' option must be set and the value of 'spelllang' is
 		used.
 
+		Can also be used as a |method|: >
+			GetText()->spellbadword()
+<
 							*spellsuggest()*
 spellsuggest({word} [, {max} [, {capital}]])
 		Return a |List| with spelling suggestions to replace {word}.
@@ -8973,6 +8990,8 @@ spellsuggest({word} [, {max} [, {capital}]])
 		'spell' option must be set and the values of 'spelllang' and
 		'spellsuggest' are used.
 
+		Can also be used as a |method|: >
+			GetWord()->spellsuggest()
 
 split({expr} [, {pattern} [, {keepempty}]])			*split()*
 		Make a |List| out of {expr}.  When {pattern} is omitted or
@@ -9069,6 +9088,19 @@ str2nr({expr} [, {base}])				*str2nr()*
 		leading "0b" or "0B" is ignored.
 		Text after the number is silently ignored.
 
+		Can also be used as a |method|: >
+			GetText()->str2nr()
+
+strcharpart({src}, {start} [, {len}])			*strcharpart()*
+		Like |strpart()| but using character index and length instead
+		of byte index and length.
+		When a character index is used where a character does not
+		exist it is assumed to be one character.  For example: >
+			strcharpart('abc', -1, 2)
+<		results in 'a'.
+
+		Can also be used as a |method|: >
+			GetText()->strcharpart(5)
 
 strchars({expr} [, {skipcc}])					*strchars()*
 		The result is a Number, which is the number of characters
@@ -9094,13 +9126,8 @@ strchars({expr} [, {skipcc}])					*strchars()*
 		      endfunction
 		    endif
 <
-strcharpart({src}, {start} [, {len}])			*strcharpart()*
-		Like |strpart()| but using character index and length instead
-		of byte index and length.
-		When a character index is used where a character does not
-		exist it is assumed to be one character.  For example: >
-			strcharpart('abc', -1, 2)
-<		results in 'a'.
+		Can also be used as a |method|: >
+			GetText()->strchars()
 
 strdisplaywidth({expr} [, {col}])			*strdisplaywidth()*
 		The result is a Number, which is the number of display cells
@@ -9115,6 +9142,9 @@ strdisplaywidth({expr} [, {col}])			*strdisplaywidth()*
 		Ambiguous, this function's return value depends on 'ambiwidth'.
 		Also see |strlen()|, |strwidth()| and |strchars()|.
 
+		Can also be used as a |method|: >
+			GetText()->strdisplaywidth()
+
 strftime({format} [, {time}])				*strftime()*
 		The result is a String, which is a formatted date and time, as
 		specified by the {format} string.  The given {time} is used,
@@ -9134,12 +9164,18 @@ strftime({format} [, {time}])				*strftime()*
 <		Not available on all systems.  To check use: >
 			:if exists("*strftime")
 
+<		Can also be used as a |method|: >
+			GetFormat()->strftime()
+
 strgetchar({str}, {index})				*strgetchar()*
 		Get character {index} from {str}.  This uses a character
 		index, not a byte index.  Composing characters are considered
 		separate characters here.
 		Also see |strcharpart()| and |strchars()|.
 
+		Can also be used as a |method|: >
+			GetText()->strgetchar(5)
+
 stridx({haystack}, {needle} [, {start}])		*stridx()*
 		The result is a Number, which gives the byte index in
 		{haystack} of the first occurrence of the String {needle}.
@@ -9159,6 +9195,8 @@ stridx({haystack}, {needle} [, {start}])		*stridx()*
 		stridx() works similar to the C function strstr().  When used
 		with a single character it works similar to strchr().
 
+		Can also be used as a |method|: >
+			GetHaystack()->stridx(needle)
 							*string()*
 string({expr})	Return {expr} converted to a String.  If {expr} is a Number,
 		Float, String, Blob or a composition of them, then the result
@@ -9211,6 +9249,9 @@ strpart({src}, {start} [, {len}])			*strpart()*
 		example, to get three bytes under and after the cursor: >
 			strpart(getline("."), col(".") - 1, 3)
 <
+		Can also be used as a |method|: >
+			GetText()->strpart(5)
+
 strridx({haystack}, {needle} [, {start}])			*strridx()*
 		The result is a Number, which gives the byte index in
 		{haystack} of the last occurrence of the String {needle}.
@@ -9229,6 +9270,9 @@ strridx({haystack}, {needle} [, {start}])			*strridx()*
 		When used with a single character it works similar to the C
 		function strrchr().
 
+		Can also be used as a |method|: >
+			GetHaystack()->strridx(needle)
+
 strtrans({expr})					*strtrans()*
 		The result is a String, which is {expr} with all unprintable
 		characters translated into printable characters |'isprint'|.
@@ -9277,6 +9321,9 @@ submatch({nr} [, {list}])			*submatch()* *E935*
 <		This finds the first number in the line and adds one to it.
 		A line break is included as a newline character.
 
+		Can also be used as a |method|: >
+			GetNr()->submatch()
+
 substitute({expr}, {pat}, {sub}, {flags})		*substitute()*
 		The result is a String, which is a copy of {expr}, in which
 		the first match of {pat} is replaced with {sub}.
@@ -9340,6 +9387,9 @@ swapinfo({fname})					*swapinfo()*
 			Not a swap file: does not contain correct block ID
 			Magic number mismatch: Info in first block is invalid
 
+		Can also be used as a |method|: >
+			GetFilename()->swapinfo()
+
 swapname({expr})					*swapname()*
 		The result is the swap file path of the buffer {expr}.
 		For the use of {expr}, see |bufname()| above.
@@ -9347,6 +9397,9 @@ swapname({expr})					*swapname()*
 		|:swapname| (unless no swap file).
 		If buffer {expr} has no swap file, returns an empty string.
 
+		Can also be used as a |method|: >
+			GetBufname()->swapname()
+
 synID({lnum}, {col}, {trans})				*synID()*
 		The result is a Number, which is the syntax ID at the position
 		{lnum} and {col} in the current window.