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patch 8.2.0427: it is not possible to check for a typo in a feature name

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Problem:    It is not possible to check for a typo in a feature name.
Solution:   Add an extra argument to has().
This commit is contained in:
Bram Moolenaar
2020-03-22 16:17:14 +01:00
parent 9b9be007e7
commit 7929651e05
5 changed files with 1232 additions and 536 deletions
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24
runtime/doc/eval.txt
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@@ -1,4 +1,4 @@
*eval.txt* For Vim version 8.2. Last change: 2020 Mar 16
*eval.txt* For Vim version 8.2. Last change: 2020 Mar 22
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -2515,7 +2515,7 @@ glob({expr} [, {nosuf} [, {list} [, {alllinks}]]])
glob2regpat({expr}) String convert a glob pat into a search pat
globpath({path}, {expr} [, {nosuf} [, {list} [, {alllinks}]]])
String do glob({expr}) for all dirs in {path}
has({feature}) Number |TRUE| if feature {feature} supported
has({feature} [, {check}]) Number |TRUE| if feature {feature} supported
has_key({dict}, {key}) Number |TRUE| if {dict} has entry {key}
haslocaldir([{winnr} [, {tabnr}]])
Number |TRUE| if the window executed |:lcd|
@@ -4358,8 +4358,8 @@ feedkeys({string} [, {mode}]) *feedkeys()*
'L' Lowlevel input. Only works for Unix or when using the
GUI. Keys are used as if they were coming from the
terminal. Other flags are not used. *E980*
When a CTRL-C interrupts it sets the internal
"got_int" flag.
When a CTRL-C interrupts and 't' is included it sets
the internal "got_int" flag.
'i' Insert the string instead of appending (see above).
'x' Execute commands until typeahead is empty. This is
similar to using ":normal!". You can call feedkeys()
@@ -5828,10 +5828,20 @@ globpath({path}, {expr} [, {nosuf} [, {list} [, {alllinks}]]])
GetExpr()->globpath(&rtp)
<
*has()*
has({feature}) The result is a Number, which is 1 if the feature {feature} is
supported, zero otherwise. The {feature} argument is a
string. See |feature-list| below.
has({feature} [, {check}])
When {check} is omitted or is zero: The result is a Number,
which is 1 if the feature {feature} is supported, zero
otherwise. The {feature} argument is a string, case is
ignored. See |feature-list| below.
When {check} is present and not zero: The result is a Number,
which is 1 if the feature {feature} could ever be supported,
zero otherwise. This is useful to check for a typo in
{feature}. Keep in mind that an older Vim version will not
know about a feature added later.
Also see |exists()|.
Note that to skip code that has a syntax error when the
feature is not available, Vim may skip the rest of the line
and miss a following `endif`. Therfore put the `endif` on a