Add theme-set/switching logic, and minor nvim, tmux, obsidian changes

src_files/.config/nvim/lua/util_functions.lua

@@ -0,0 +1,34 @@
+function ThemeUpdate()
+    local scheme_name = "tokyodark" -- default if unable to parse from file
+    local current_theme_file = vim.fn.stdpath("config") .. "/current-theme"
+    local ok, theme = pcall(dofile, current_theme_file)
+    if ok then
+        scheme_name = theme.colorscheme_name
+    end
+    vim.cmd.colorscheme(scheme_name)
+    pcall(dofile, vim.fn.stdpath('config') .. '/lua/theme_transparency.lua')
+end
+
+function TmpBuff(split_opt)
+    local new_cmd = split_opt or "enew"
+    vim.cmd(new_cmd)
+    vim.opt_local.buftype = "nofile"
+    vim.opt_local.bufhidden = "hide"
+    vim.opt_local.swapfile = false
+    vim.cmd("file tmp_" .. os.date("%Y%m%d_%H%M%S"))
+end
+
+function ReadShellCmd(command)
+    vim.cmd("read !" .. command)
+end
+
+function ToggleTabsSpaces()
+    if vim.opt.expandtab:get() then
+        vim.opt.expandtab = false
+        print("using actual tabs")
+    else
+        vim.opt.expandtab = true
+        print("using spaces in place of tabs")
+    end
+end
+