8 func CheckFeature(name)  argument
9   if !has(a:name, 1)
10     throw 'Checking for non-existent feature ' .. a:name
12   if !has(a:name)
13     MissingFeature a:name
19 func CheckNotFeature(name)  argument
20   if !has(a:name, 1)
21     throw 'Checking for non-existent feature ' .. a:name
23   if has(a:name)
24     throw 'Skipped: ' .. a:name .. ' feature present'
30 func CheckOption(name)  argument
31   if !exists('&' .. a:name)
32     throw 'Checking for non-existent option ' .. a:name
34   if !exists('+' .. a:name)
35     throw 'Skipped: ' .. a:name .. ' option not supported'
41 func CheckFunction(name)  argument
42   if !exists('?' .. a:name)
43     throw 'Checking for non-existent function ' .. a:name
45   if !exists('*' .. a:name)
46     throw 'Skipped: ' .. a:name .. ' function missing'
52 func CheckCommand(name)  argument
53   if !exists(':' .. a:name)
54     throw 'Skipped: ' .. a:name .. ' command not supported'
60 func CheckExecutable(name)  argument
61   if !executable(a:name)
62     throw 'Skipped: ' .. a:name .. ' program not executable'
68 func CheckPython(name)  argument
69   if a:name == ''
141 func CheckEnv(name)  argument
142   if empty(eval('$' .. a:name))
143     throw 'Skipped: Environment variable ' .. a:name .. ' is not set'