refactor: add version comparison functions

Added 2 functions that compare versions strings according to semantic
version. This is part of a plan to compose the flags of the CLI command
from an object with flag details.

1 files changed, 25 insertions, 0 deletions

diff --git a/autoload/prettier/utils/version.vim b/autoload/prettier/utils/version.vim
new file mode 100644
index 0000000..3cbbb73
--- /dev/null
+++ b/autoload/prettier/utils/version.vim
@@ -0,0 +1,25 @@
+" Returns 1 if the first argument is the greater version, returns 0 if the
+" arguments are the same version, or returns -1 if the first argument is the
+" lesser version.
+function! prettier#utils#version#Compare_versions(a, b) abort
+  let [l:a_major, l:a_minor, l:a_patch; l:rest] = a:a->split('\D')
+          \ ->map('str2nr(v:val)')
+  let [l:b_major, l:b_minor, l:b_patch; l:rest] = a:b->split('\D')
+          \ ->map('str2nr(v:val)')
+  let l:is_a_greater =
+          \ l:a_major > l:b_major
+          \ || (l:a_major == l:b_major && l:a_minor > l:b_minor)
+          \ || (l:a_major == l:b_major && l:a_minor == l:b_minor
+          \   && l:a_patch > l:b_patch)
+  let l:is_a_equal_b =
+          \ l:a_major == l:b_major
+          \ && l:a_minor == l:b_minor
+          \ && l:a_patch == l:b_patch
+  return l:is_a_greater ? 1 : (l:is_a_equal_b ? 0 : -1)
+endfunction
+
+" Returns 1 if the first argument is greater than or equal to the second,
+" otherwise returns 0.
+function! prettier#utils#version#Is_greater_or_equal_version(a, b) abort
+  return prettier#utils#version#Compare_versions(a:a, a:b) != -1
+endfunction