diff options
Diffstat (limited to 'runtime/doc/vim9.txt')
| -rw-r--r-- | runtime/doc/vim9.txt | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/runtime/doc/vim9.txt b/runtime/doc/vim9.txt index 21bc542a17..b14ff0b101 100644 --- a/runtime/doc/vim9.txt +++ b/runtime/doc/vim9.txt @@ -1,4 +1,4 @@ -*vim9.txt* For Vim version 8.2. Last change: 2020 Jun 22 +*vim9.txt* For Vim version 8.2. Last change: 2020 Jun 24 VIM REFERENCE MANUAL by Bram Moolenaar @@ -378,6 +378,49 @@ string. > In Vim9 script one can use "true" for v:true and "false" for v:false. +What to watch out for ~ + *vim9-gotchas* +Vim9 was designed to be closer to often used programming languages, but at the +same time tries to support the legacy Vim commands. Some compromises had to +be made. Here is a summary of what might be unexpected. + +Ex command ranges need to be prefixed with a colon. > + -> " legacy Vim: shifts the previous line to the right + ->func() " Vim9: method call + :-> " Vim9: shifts the previous line to the right + + %s/a/b " legacy Vim: substitute on all lines + x = alongname + % another " Vim9: line continuation without a backslash + :%s/a/b " Vim9: substitute on all lines + +Functions defined with `:def` compile the whole function. Legacy functions +can bail out, and the following lines are not parsed: > + func Maybe() + if !has('feature') + return + endif + use-feature + endfunc +Vim9 functions are compiled as a whole: > + def Maybe() + if !has('feature') + return + endif + use-feature " May give compilation error + enddef +For a workaround, split it in two functions: > + func Maybe() + if has('feature') + call MaybyInner() + endif + endfunc + if has('feature') + def MaybeInner() + use-feature + enddef + endif + ============================================================================== 3. New style functions *fast-functions* |