runtime(ftplugin): allow to exec if curdir is in PATH

In case the current directory is present as valid $PATH entry, it is OK
to call the program from it, even if vim curdir is in that same
directory.

(Without that patch, for instance, you will not be able to open .zip
files while your current directory is /bin)

closes: #13027

Signed-off-by: Christian Brabandt <cb@256bit.org>

5 files changed, 22 insertions, 5 deletions

diff --git a/runtime/autoload/gzip.vim b/runtime/autoload/gzip.vim
index ac9e37bf85..6d0bb13401 100644
--- a/runtime/autoload/gzip.vim
+++ b/runtime/autoload/gzip.vim
@@ -11,7 +11,10 @@ fun s:check(cmd)
   let name = substitute(a:cmd, '\(\S*\).*', '\1', '')
   if !exists("s:have_" . name)
     " safety check, don't execute anything from the current directory
-    let f = fnamemodify(exepath(name), ":p:h") !=# getcwd()
+    let s:tmp_cwd = getcwd()
+    let f = (fnamemodify(exepath(name), ":p:h") !=# s:tmp_cwd
+          \ || (index(split($PATH,has("win32")? ';' : ':'), s:tmp_cwd) != -1 && s:tmp_cwd != '.'))
+    unlet s:tmp_cwd
     if !f
       echoerr "Warning: NOT executing " .. name .. " from current directory!"
     endif
diff --git a/runtime/autoload/zip.vim b/runtime/autoload/zip.vim
index 0331a542ac..8b39c91c3a 100644
--- a/runtime/autoload/zip.vim
+++ b/runtime/autoload/zip.vim
@@ -57,10 +57,15 @@ if !exists("g:zip_extractcmd")
  let g:zip_extractcmd= g:zip_unzipcmd
 endif
 
-if fnamemodify(exepath(g:zip_unzipcmd), ":p:h") ==# getcwd()
+let s:tmp_cwd = getcwd()
+if (fnamemodify(exepath(g:zip_unzipcmd), ":p:h") ==# getcwd()
+          \ && (index(split($PATH,has("win32")? ';' : ':'), s:tmp_cwd) == -1 || s:tmp_cwd == '.'))
+ unlet s:tmp_cwd
  echoerr "Warning: NOT executing " .. g:zip_unzipcmd .. " from current directory!"
  finish
 endif
+unlet s:tmp_cwd
+
 " ----------------
 "  Functions: {{{1
 " ----------------
diff --git a/runtime/ftplugin/perl.vim b/runtime/ftplugin/perl.vim
index edc7b960f1..4361097f32 100644
--- a/runtime/ftplugin/perl.vim
+++ b/runtime/ftplugin/perl.vim
@@ -55,7 +55,9 @@ endif
 " Set this once, globally.
 if !exists("perlpath")
     " safety check: don't execute perl from current directory
-    if executable("perl") && fnamemodify(exepath("perl"), ":p:h") != getcwd()
+    let s:tmp_cwd = getcwd()
+    if executable("perl") && (fnamemodify(exepath("perl"), ":p:h") != s:tmp_cwd
+          \ || (index(split($PATH,has("win32")? ';' : ':'), s:tmp_cwd) != -1 && s:tmp_cwd != '.'))
       try
 	if &shellxquote != '"'
 	    let perlpath = system('perl -e "print join(q/,/,@INC)"')
@@ -71,6 +73,7 @@ if !exists("perlpath")
 	" current directory and the directory of the current file.
 	let perlpath = ".,,"
     endif
+    unlet s:tmp_cwd
 endif
 
 " Append perlpath to the existing path value, if it is set.  Since we don't
diff --git a/runtime/ftplugin/ruby.vim b/runtime/ftplugin/ruby.vim
index daffe1e0dc..a424801cd1 100644
--- a/runtime/ftplugin/ruby.vim
+++ b/runtime/ftplugin/ruby.vim
@@ -77,11 +77,14 @@ function! s:query_path(root) abort
   let cwd = fnameescape(getcwd())
   try
     exe cd fnameescape(a:root)
-    if fnamemodify(exepath('ruby'), ':p:h') ==# cwd
+    let s:tmp_cwd = getcwd()
+    if (fnamemodify(exepath('ruby'), ':p:h') ==# cwd
+          \ && (index(split($PATH,has("win32")? ';' : ':'), s:tmp_cwd) == -1 || s:tmp_cwd == '.'))
       let path = []
     else
       let path = split(system(path_check),',')
     endif
+    unlet s:tmp_cwd
     exe cd cwd
     return path
   finally
diff --git a/runtime/ftplugin/zig.vim b/runtime/ftplugin/zig.vim
index cd18bfe2bd..45ea582615 100644
--- a/runtime/ftplugin/zig.vim
+++ b/runtime/ftplugin/zig.vim
@@ -40,14 +40,17 @@ endif
 let &l:define='\v(<fn>|<const>|<var>|^\s*\#\s*define)'
 
 " Safety check: don't execute zip from current directory
+let s:tmp_cwd = getcwd()
 if !exists('g:zig_std_dir') && exists('*json_decode') &&
-    \  executable('zig') && fnamemodify(exepath("zig"), ":p:h") != getcwd()
+    \  executable('zig') && (fnamemodify(exepath("zig"), ":p:h") != s:tmp_cwd
+          \ || (index(split($PATH,has("win32")? ';' : ':'), s:tmp_cwd) != -1 && s:tmp_cwd != '.'))
     silent let s:env = system('zig env')
     if v:shell_error == 0
         let g:zig_std_dir = json_decode(s:env)['std_dir']
     endif
     unlet! s:env
 endif
+unlet s:tmp_cwd
 
 if exists('g:zig_std_dir')
     let &l:path = &l:path . ',' . g:zig_std_dir