From 961e50bfc2128e04c7771ee0150d9024f5616987 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Tue, 21 May 2019 00:01:53 +1200
Subject: First version

---
 README.md                            | 14 ++++++++++++++
 VERSION                              |  1 +
 autoload/shebang_change_filetype.vim |  7 +++++++
 doc/shebang_change_filetype.txt      | 22 ++++++++++++++++++++++
 plugin/shebang_change_filetype.vim   | 25 +++++++++++++++++++++++++
 5 files changed, 69 insertions(+)
 create mode 100644 README.md
 create mode 100644 VERSION
 create mode 100644 autoload/shebang_change_filetype.vim
 create mode 100644 doc/shebang_change_filetype.txt
 create mode 100644 plugin/shebang_change_filetype.vim

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3f6524a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+shebang\_change\_filetype.vim
+=============================
+
+This plugin watches the first line of a buffer for the presence of a "shebang",
+beginning with the characters "#!".  If such a line is added or modified,
+filetype detection is re-run.
+
+License
+-------
+
+Copyright (c) [Tom Ryder][1].  Distributed under the same terms as Vim itself.
+See `:help license`.
+
+[1]: https://sanctum.geek.nz/
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..6e8bf73
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+0.1.0
diff --git a/autoload/shebang_change_filetype.vim b/autoload/shebang_change_filetype.vim
new file mode 100644
index 0000000..081eaf1
--- /dev/null
+++ b/autoload/shebang_change_filetype.vim
@@ -0,0 +1,7 @@
+" Check whether the first line was changed and looks like a shebang, and if
+" so, re-run filetype detection
+function! shebang_change_filetype#Check() abort
+  if line('''[') == 1 && getline(1) =~# '^#!'
+    doautocmd filetypedetect BufRead
+  endif
+endfunction
diff --git a/doc/shebang_change_filetype.txt b/doc/shebang_change_filetype.txt
new file mode 100644
index 0000000..0d84d95
--- /dev/null
+++ b/doc/shebang_change_filetype.txt
@@ -0,0 +1,22 @@
+*shebang_change_filetype.txt*	For Vim version 7.0	Last change: 2019 May 20
+
+DESCRIPTION				*shebang_change_filetype*
+
+This plugin watches the first line of a buffer for the presence of a
+"shebang", beginning with the characters "#!".  If such a line is added or
+modified, filetype detection is re-run.
+
+REQUIREMENTS				*shebang_change_filetype-requirements*
+
+This plugin only loads if 'compatible' is not set, and requires the |+autocmd|
+feature.  It works best if the |TextChanged| event is also available.
+
+AUTHOR					*shebang_change_filetype-author*
+
+Written and maintained by Tom Ryder <tom@sanctum.geek.nz>.
+
+LICENSE					*shebang_change_filetype-license*
+
+Licensed for distribution under the same terms as Vim itself (see |license|).
+
+ vim:tw=78:ts=8:ft=help:norl:
diff --git a/plugin/shebang_change_filetype.vim b/plugin/shebang_change_filetype.vim
new file mode 100644
index 0000000..ca6c183
--- /dev/null
+++ b/plugin/shebang_change_filetype.vim
@@ -0,0 +1,25 @@
+"
+" shebang_change_filetype.vim: On leaving insert mode, check whether the first
+" line was changed and looks like a shebang format.
+"
+" Author: Tom Ryder <tom@sanctum.geek.nz>
+" License: Same as Vim itself
+"
+if exists('loaded_shebang_change_filetype') || &compatible
+  finish
+endif
+if !has('autocmd') || v:version < 700
+  finish
+endif
+let loaded_shebang_change_filetype = 1
+
+" Set up hook for before writes to check the buffer for new shebangs
+augroup shebang_change_filetype
+  autocmd!
+  autocmd InsertLeave *
+       \ call shebang_change_filetype#Check()
+  if exists('##TextChanged')
+    autocmd TextChanged *
+          \ call shebang_change_filetype#Check()
+  endif
+augroup END
-- 
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