nvim: configure snippets, add license snippets

.config/nvim/lua/my/coding.lua

@@ -49,3 +49,12 @@ packer.use {
         vim.g.AutoPairsFlyMode = 0
     end
 }
+
+packer.use {
+    'https://github.com/L3MON4D3/LuaSnip',
+    config = function()
+        require("luasnip.loaders.from_lua").load(
+            { paths = vim.fn.stdpath('config') .. '/snippets'} )
+    end
+}
+

.config/nvim/lua/my/functions.lua

@@ -81,3 +81,29 @@ vim.api.nvim_create_autocmd(
         callback = MY_set_colorcolumn
     }
 )
+
+function MY_get_project_root()
+    local path = vim.api.nvim_buf_get_name(0)
+    local root_markers = {
+        '.git', '.hg', '.svn', '.bzr', '_darcs',
+        '.projectile', '.clang-format', '.luarc.json'
+    }
+    local sep = '/'
+
+    repeat
+        path = path:gsub('/[^/]*$', '')
+        for _, marker in ipairs(root_markers) do
+            if io.open(path .. sep .. marker) then
+                return path
+            end
+        end
+    until path == ''
+end
+
+function MY_shell_capture(command)
+    local handle = io.popen(command)
+    if not handle then return '' end
+    local result = handle:read() or ''
+    handle:close()
+    return result
+end

.config/nvim/snippets/cpp.lua

@@ -0,0 +1,75 @@
+require('my/functions')
+
+-- <https://github.com/L3MON4D3/LuaSnip/blob/69cb81cf7490666890545fef905d31a414edc15b/lua/luasnip/config.lua#L82-L104>
+local s = require("luasnip.nodes.snippet").S
+local f = require("luasnip.nodes.functionNode").F
+local i = require("luasnip.nodes.insertNode").I
+local fmt = require("luasnip.extras.fmt").fmt
+
+local agpl =
+[[/*  This file is part of {project}.
+ *  Copyright © {year} {name} <{email}>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+{cursor}]]
+
+local bsd0 =
+[[/*  This file is part of {project}.
+ *  Copyright © {year} {name} <{email}>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ *  SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ *  OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ *  CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+{cursor}]]
+
+return {
+    s(
+        {
+            trig = 'AGPL',
+            name = 'AGPL-3.0-only',
+            dscr = 'Inserts the GNU Affero General Public License, version 3'
+        },
+        fmt(agpl, {
+            project = MY_get_project_root():gsub('.*/', ''),
+            year = f(function() return os.date('%Y') end),
+            name = MY_shell_capture('git config user.name'),
+            email = MY_shell_capture('git config user.email'),
+            cursor = i()
+        })
+    ),
+    s(
+        {
+            trig = '0BSD',
+            name = '0BSD',
+            dscr = 'Inserts the BSD Zero Clause License'
+        },
+        fmt(bsd0, {
+            project = MY_get_project_root():gsub('.*/', ''),
+            year = f(function() return os.date('%Y') end),
+            name = MY_shell_capture('git config user.name'),
+            email = MY_shell_capture('git config user.email'),
+            cursor = i()
+        })
+    )
+}