home: vim: git: use 'partial'

Love me some functional goodness.

This was taken from [1].

[1]: https://reddit.com/r/lua/comments/fh2go5

modules/home/vim/lua/ambroisie/utils.lua

@@ -48,4 +48,22 @@ M.list_lsp_clients = function(bufnr)
     return names
 end
 
+--- partially apply a function with given arguments
+M.partial = function(f, ...)
+    local a = { ... }
+    local a_len = select("#", ...)
+
+    return function(...)
+        local tmp = { ... }
+        local tmp_len = select("#", ...)
+
+        -- Merge arg lists
+        for i = 1, tmp_len do
+            a[a_len + i] = tmp[i]
+        end
+
+        return f(unpack(a, 1, a_len + tmp_len))
+    end
+end
+
 return M

modules/home/vim/plugin/settings/git.lua

@@ -1,4 +1,5 @@
 local gitsigns = require("gitsigns")
+local utils = require("ambroisie.utils")
 local wk = require("which-key")
 
 --- Transform `f` into a function which acts on the current visual selection
@@ -11,16 +12,14 @@ local function make_visual(f)
 end
 
 local function nav_hunk(dir)
-    return function()
-        if vim.wo.diff then
-            local map = {
-                prev = "[c",
-                next = "]c",
-            }
-            vim.cmd.normal({ map[dir], bang = true })
-        else
-            gitsigns.nav_hunk(dir)
-        end
+    if vim.wo.diff then
+        local map = {
+            prev = "[c",
+            next = "]c",
+        }
+        vim.cmd.normal({ map[dir], bang = true })
+    else
+        gitsigns.nav_hunk(dir)
     end
 end
 
@@ -33,8 +32,8 @@ gitsigns.setup({
 
 local keys = {
     -- Navigation
-    ["[c"] = { nav_hunk("prev"), "Previous hunk/diff" },
-    ["]c"] = { nav_hunk("next"), "Next hunk/diff" },
+    ["[c"] = { utils.partial(nav_hunk, "prev"), "Previous hunk/diff" },
+    ["]c"] = { utils.partial(nav_hunk, "next"), "Next hunk/diff" },
 
     -- Commands
     ["<leader>g"] = {