Add vim bash script template, with strict mode

New files with the `.sh` extension will load the shebang and
strict-mode options.

Also:
 - Note that short message settings do not completely remove 'Hit Enter
   to continue' messages.

vim/settings/templates.vim

@@ -0,0 +1,6 @@
+" Template for shell scripts.
+" Removes comments after line 1, places cursor at end of file.
+autocmd BufNewFile *.sh 0r ~/dotfiles/vim/templates/bashscript | 2,$ g/^#/d | normal G
+
+" Make shell scripts executable on save.
+autocmd BufWritePost *.sh if getline(1) =~ "^#!/bin/" | silent !chmod +x <afile> | endif

vim/templates/bashscript

@@ -0,0 +1,20 @@
+#!/bin/bash
+#
+# The following comments are all removed when loading this template:
+#
+# The Unofficial "Bash Strict Mode"
+# -e           Failed commands exit
+# -u           Unbound variables exit
+# -o pipefail  Do not hide piped-command failures
+# IFS as newline and tab are better for loops (and name with spaces).
+#
+# Tips:
+# - Options can be switched off and on as required:
+#   - Toggle `-e` if previous command's return value is needed (`$?`).
+#   - Toggle `-u` if sourcing another non-conforming script.
+# - Use default values for positional parameters i.e. `${1:-}`.
+# - Intentionally undefined variables should be set to "" rather than not set.
+# - Learn about "exit traps" to perform `try-catch-finally`-like cleanup tasks
+#
+set -euo pipefail
+IFS=$'\n\t'

vim/vimrc

@@ -41,7 +41,7 @@ set winminheight=0             " Windows can be 0 line high
 set wildmenu                   " Show list instead of just completing
 set modeline                   " Support vim modelines at the top of files
 set whichwrap=b,s,h,l,<,>,[,]  " Backspace and cursor keys wrap too
-set shortmess+=filmnrxoOtT     " Abbrev. of messages (avoids 'hit enter')
+set shortmess+=filmnrxoOtT     " Abbrev. of messages (reduces 'hit enter')
 set scrolloff=5                " Minimum lines to keep above and below cursor
 set sidescroll=1
 set sidescrolloff=10