install.sh: install Homebrew, add bash, and seed the colour files

Three things a machine set up from this repo alone hit on its first run:

Homebrew was a dead end -- install.sh printed the command and exited, leaving
the one prerequisite everything else needs to be run by hand. It installs it
now, NONINTERACTIVE so it does not wait on a RETURN; the sudo password is still
asked for, which is why this script is run by hand.

bash was missing from the Brewfile, so bin/open and secrets/ ran under the
3.2 macOS ships and failed on `${v,,}`; config/bashrc also looks for the
bash-completion 2.x that wants 4.2.

Ghostty refused to start -- "error opening config-file ... error.FileNotFound"
-- because config-file pointed at the colour file bin/theme writes, which does
not exist until theme has run. The include is optional now (`?`), and this
script seeds the colour files when a machine has none, leaving a machine that
already has a theme alone.

1 files changed, 3 insertions, 0 deletions

diff --git a/Brewfile b/Brewfile
index 44eb65d..5a87219 100644
--- a/Brewfile
+++ b/Brewfile
@@ -5,6 +5,9 @@
 # with `brew bundle`, which only adds.
 
 # Something breaks without these.
+brew "bash"                # bin/open and secrets/ use bash 4 syntax (${v,,});
+                           # macOS ships 3.2, and config/bashrc looks for the
+                           # bash-completion 2.x that needs 4.2
 brew "tmux"                # both terminals start every window in tmux
 brew "neovim"              # the editor; vi, vim and git all call nvim
 brew "age"                 # szecret