nixpkgs/neovim: have telescope open commits in fugitive

.config/nixpkgs/neovim/plugins.lua

@@ -13,6 +13,24 @@ vim.filetype.add({
 })
 
 -- file/buffer/etc picker
+local telescope_actions = require('telescope.actions')
+local action_state = require('telescope.actions.state')
+local actions = {}
+
+actions.git_show_commit = function(prompt_bufnr)
+  local selection = action_state.get_selected_entry()
+  local path = vim.fn.FugitiveFind(selection.value)
+  telescope_actions.close(prompt_bufnr)
+  vim.cmd.edit(path)
+end
+
+local commit_mappings = {
+  i = {
+    ['<CR>'] = actions.git_show_commit,
+    ['<C-r>c'] = telescope_actions.git_checkout,
+  }
+}
+
 require('telescope').setup({
   defaults = {
     mappings = {
@@ -81,6 +99,12 @@ require('telescope').setup({
     find_files = {
       find_command = { "fd", "--type", "f", "--strip-cwd-prefix" }
     },
+    git_commits = {
+      mappings = commit_mappings,
+    },
+    git_bcommits = {
+      mappings = commit_mappings,
+    },
   },
 })
 
@@ -94,6 +118,13 @@ local telescope_previewers = require('telescope.previewers')
 local telescope_putils = require('telescope.previewers.utils')
 local telescope_conf = require('telescope.config').values
 
+-- arbitrary git log picker
+vim.api.nvim_create_user_command('GLg', function(opts)
+  local git_command = { "git", "log", "--pretty=oneline", "--abbrev-commit" }
+  vim.list_extend(git_command, opts.fargs)
+  telescope_builtin.git_commits({ git_command = git_command })
+end, { nargs = '*', complete = vim.fn['fugitive#LogComplete'] })
+
 -- custom picker to fallback to files if no git
 _G.project_files = function()
   local ok = pcall(telescope_builtin.git_files, { show_untracked = true })