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let s:version_cache = {}
" Reset the version cache used for parsing the version.
function! ale#semver#ResetVersionCache() abort
let s:version_cache = {}
endfunction
" Given an executable name and some lines of output, which can be empty,
" parse the version from the lines of output, or return the cached version
" triple [major, minor, patch]
"
" If the version cannot be found, an empty List will be returned instead.
function! ale#semver#GetVersion(executable, version_lines) abort
let l:version = get(s:version_cache, a:executable, [])
for l:line in a:version_lines
let l:match = matchlist(l:line, '\v(\d+)\.(\d+)\.?(\d?)')
if !empty(l:match)
let l:version = [l:match[1] + 0, l:match[2] + 0, l:match[3] + 0]
let s:version_cache[a:executable] = l:version
break
endif
endfor
return l:version
endfunction
" Return 1 if the semver version has been cached for a given executable.
function! ale#semver#HasVersion(executable) abort
return has_key(s:version_cache, a:executable)
endfunction
" Given two triples of integers [major, minor, patch], compare the triples
" and return 1 if the LHS is greater than or equal to the RHS.
"
" Pairs of [major, minor] can also be used for either argument.
"
" 0 will be returned if the LHS is an empty List.
function! ale#semver#GTE(lhs, rhs) abort
if empty(a:lhs)
return 0
endif
if a:lhs[0] > a:rhs[0]
return 1
elseif a:lhs[0] == a:rhs[0]
if a:lhs[1] > a:rhs[1]
return 1
elseif a:lhs[1] == a:rhs[1]
return get(a:lhs, 2) >= get(a:rhs, 2)
endif
endif
return 0
endfunction
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