Initial commit

lua/utils.lua

@@ -0,0 +1,86 @@
+--[[
+    Copyright 2023 Oscar Wallberg
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        https://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+]]
+
+M = {}
+
+M.os_name = vim.loop.os_uname().sysname
+
+function M.has_value(tab, val)
+    for _, value in ipairs(tab) do if value == val then return true end end
+
+    return false
+end
+
+---@param cmd table: Array of executable + args
+function M.exec(cmd)
+    local out = vim.fn.system(cmd)
+    local rc = vim.v.shell_error
+
+    return { out = out, rc = rc }
+end
+
+function M.get_color(group, attr)
+    return vim.fn.synIDattr(vim.fn.synIDtrans(vim.fn.hlID(group)), attr)
+end
+
+function M.get_hl(name)
+    local ok, hl = pcall(vim.api.nvim_get_hl_by_name, name, true)
+    if not ok then return end
+    for _, key in pairs({ 'foreground', 'background', 'special' }) do
+        if hl[key] then hl[key] = string.format('#%06x', hl[key]) end
+    end
+    return hl
+end
+
+--- Check that an executable is available
+--- @param exe string: Array to look for
+--- @return boolean
+function M.is_available(exe)
+    return vim.fn.executable(exe) == 1
+end
+
+--- Check that at least one executable is available
+--- @param exes table: Array of exes
+--- @return boolean
+function M.any_available(exes)
+    for _, e in ipairs(exes) do
+        if M.is_available(e) then
+            return true
+        end
+    end
+
+    return false
+end
+
+--- Asserts that an executable is available
+--- Raises error if missing.
+--- @param exe string: Array to look for
+function M.assert_available(exe)
+    if not M.is_available(exe) then
+        error("Missing executable '" .. exe .. "'.")
+    end
+end
+
+--- Asserts that at least one executable is available
+--- Raises error if missing.
+--- @param exes table: Array of exes
+function M.assert_any_available(exes)
+    if not M.any_available(exes) then
+        error('At least one of the following is required:\n' .. table.concat(exes, ', '))
+    end
+end
+
+return M