refactor(git): split status code parsing into status.lua

lua/git/status.lua

@@ -0,0 +1,52 @@
+local M = {}
+
+M.UNMERGED = {
+    DD = true,
+    AU = true,
+    UD = true,
+    UA = true,
+    DU = true,
+    AA = true,
+    UU = true,
+}
+
+---@param code string
+---@return string? char
+---@return string? hl_group
+function M.indicator(code)
+    if code == "" then
+        return nil
+    end
+    if code == "??" then
+        return "?", "GitUntracked"
+    end
+    if code == "!!" then
+        return "!", "GitIgnored"
+    end
+    if M.UNMERGED[code] then
+        return "U", "GitUnmerged"
+    end
+    local x, y = code:sub(1, 1), code:sub(2, 2)
+    if x == "R" or y == "R" then
+        return "R", "GitRenamed"
+    end
+    if y == " " and x ~= " " then
+        return x, "GitStaged"
+    end
+    if y == "D" then
+        return "D", "GitDeleted"
+    end
+    return "M", "GitUnstaged"
+end
+
+---@param code string
+---@return string?
+function M.format(code)
+    local char, hl = M.indicator(code)
+    if not char then
+        return nil
+    end
+    return string.format("%%#%s#%s%%*", hl, char)
+end
+
+return M