feat(nvim): add keybinding to go to next/previous equal indent

dots/.config/nvim/lua/core/mappings.lua

@@ -1,5 +1,46 @@
 local M = {}
 
+---Stolen with ❤️ from https://github.com/tj-moody/.dotfiles/blob/c2afec06b68cd0413c20d332672907c11f0a9c47/nvim/lua/mappings.lua#L171C1-L171C1
+---Adapted from https://vi.stackexchange.com/a/12870
+---Traverse to indent >= or > current indent
+---@param direction integer 1 - forwards | -1 - backwards
+---@param equal boolean include lines equal to current indent in search?
+local function indent_traverse(direction, equal)     -- {{{
+    return function()
+        -- Get the current cursor position
+        local current_line, column = unpack(vim.api.nvim_win_get_cursor(0))
+        local match_line = current_line
+        local match_indent = false
+        local match = false
+
+        local buf_length = vim.api.nvim_buf_line_count(0)
+
+        -- Look for a line of appropriate indent
+        -- level without going out of the buffer
+        while (not match)
+            and (match_line ~= buf_length)
+            and (match_line ~= 1)
+        do
+            match_line = match_line + direction
+            local match_line_str = vim.api.nvim_buf_get_lines(0, match_line - 1, match_line, false)[1]
+            -- local match_line_is_whitespace = match_line_str and match_line_str:match('^%s*$')
+            local match_line_is_whitespace = match_line_str:match('^%s*$')
+
+            if equal then
+                match_indent = vim.fn.indent(match_line) <= vim.fn.indent(current_line)
+            else
+                match_indent = vim.fn.indent(match_line) < vim.fn.indent(current_line)
+            end
+            match = match_indent and not match_line_is_whitespace
+        end
+
+        -- If a line is found go to line
+        if match or match_line == buf_length then
+            vim.fn.cursor({ match_line, column + 1 })
+        end
+    end
+end
+
 M.setup = function()
     -- set mapleader to space
     vim.g.mapleader = " "
@@ -76,6 +117,9 @@ M.setup = function()
 
     -- Binding to keep S-Space in terminals from not sending <Space>
     vim.keymap.set("t", "<S-Space>", "<Space>", { silent = true, desc = "Terminal: Hack S-Space to Space" })
+
+    vim.keymap.set("n", "<C-j>", indent_traverse(1, true), { silent = true, desc = "Move: To next equal indent"})
+    vim.keymap.set("n", "<C-k>", indent_traverse(-1, true), { silent = true, desc = "Move: To previous equal indent"})
 end
 
 return M