build core, basic and go variants and add template

core/Containerfile

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+FROM alpine:latest
+
+# Install alpine packages
+RUN apk add --no-cache \
+  mandoc mandoc-doc less less-doc bash bash-doc bash-completion \
+  tmux tmux-doc neovim neovim-doc
+
+# Add shell configs
+COPY shell /etc
+
+# Add neovim config
+COPY nvim /etc/xdg/nvim
+ENV VIMINIT=":luafile /etc/xdg/nvim/init.lua"
+
+# Configure environment
+USER 1000:1000
+WORKDIR /work
+ENV HOME=/tmp TERM=xterm-256color LANG=en_US.UTF-8
+ENTRYPOINT ["/usr/bin/tmux", "new-session", "/usr/bin/nvim"]

core/nvim/init.lua

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+-- Change files in place
+vim.o.backupcopy = 'yes'
+
+-- Disable auto comment
+vim.cmd.autocmd('FileType', '*', 'setlocal', 'formatoptions-=cro')
+
+-- Disable double spaces when joining
+vim.o.joinspaces = false
+
+-- Code folding
+vim.o.foldmethod = 'indent'
+vim.o.foldlevel = 99
+
+-- Indentation
+vim.o.tabstop = 2
+vim.o.shiftwidth = 2
+vim.o.softtabstop = -1
+vim.o.expandtab = true
+
+-- Visible line breaks
+vim.o.list = true
+vim.o.listchars = 'eol:¬'
+
+-- Relative line numbers
+vim.o.number = true
+vim.o.relativenumber = true
+
+-- 80 character indication
+vim.o.colorcolumn = '80'
+
+-- Status window height
+vim.o.previewheight = 30
+
+-- Theme
+vim.o.termguicolors = true
+vim.cmd.colorscheme('slate')
+
+-- Keyboard shortcuts
+vim.keymap.set('n', '<c-n>', ':bn<cr>', { silent = true })
+vim.keymap.set('n', '<c-p>', ':bp<cr>', { silent = true })
+vim.keymap.set('n', '<c-l>', ':noh<cr><c-l>')
+vim.keymap.set('n', 'gp', "'[V']", { remap = true })
+vim.keymap.set('i', '<c-b>', '{}<left>', { silent = true } )
+vim.keymap.set('i', '<c-b> ', '{  }<left><left>', { silent = true } )
+vim.keymap.set('i', '<c-b><cr>', '{<cr>}O', { silent = true } )
+vim.keymap.set('i', '<c-space>', '<space>', { remap = true })
+
+-- Add command to show help in current window
+vim.api.nvim_create_user_command('Help', function(a)
+  -- Create empty 'help' buffer
+  vim.cmd.enew()
+  vim.o.buftype = 'help'
+  local buf = vim.fn.bufnr('%')
+
+  -- Show help and handle errors
+  ok, msg = pcall(vim.cmd.help, a.fargs[1] or "help.txt")
+  if not ok then vim.notify(msg, vim.log.levels.ERROR); vim.cmd.bp() end
+
+  -- Wipe out empty buffer if not taken over
+  if vim.fn.bufnr('%') ~= buf then vim.cmd.bwipeout(buf) end
+end, { nargs = '?', bar = true, complete = 'help' })
+
+-- Add command line abbreviation if at start of line
+vim.cmd.cabbrev { 'help',
+  '<c-r>=(getcmdtype() == ":" && getcmdpos() == 1) ? "Help" : "help"<cr>'
+}
+
+-- Source init directory
+vim.cmd 'runtime! init/*.lua'

core/shell/inputrc

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+set editing-mode vi
+
+$if mode=vi
+  set keymap vi-insert
+  Control-l: clear-screen
+  Control-r: vi-put
+$endif

core/shell/profile

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+# Set editor
+EDITOR='nvim'
+alias vim='nvim'
+alias vi='nvim'
+
+# Configure history
+HISTCONTROL=ignoreboth
+unset HISTFILE
+
+# Handy aliases
+alias la='ls -A'
+alias ll='la -l'
+alias ..='cd ..'
+alias e='exit'
+
+# Git branch helper
+git_branch_prompt() {
+  local branch="$(git branch --show-current 2> /dev/null)"
+  [[ -z "$branch" ]] || echo "[${branch}]"
+}
+
+# Colorful command prompt
+PS1='\[\e[33m\][\[\e[0m\]\W\[\e[33m\]]\[\e[32m\]$(git_branch_prompt)\[\e[33m\]\$\[\e[37m\] '
+trap 'printf \\e[0m' DEBUG

core/shell/tmux.conf

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+# Set default shell
+set -g default-shell /bin/bash
+
+# Increase history size
+set -g history-limit 50000
+
+# Disable escape delay
+set-option -sg escape-time 0
+
+# Enable mouse and focus events
+set -g mouse on
+set -g focus-events on
+
+################
+# Key bindings #
+################
+
+# Change prefix
+set-option -g prefix C-a
+
+# Remap split commands
+unbind '"'
+unbind %
+bind s split-window -v
+bind v split-window -h
+
+# Remap pane selection
+unbind Up
+unbind Down
+unbind Left
+unbind Right
+
+is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
+    | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?)(diff)?$'"
+bind-key -n 'M-h' if-shell "$is_vim" { send-keys M-h } { if-shell -F '#{pane_at_left}'    {} { select-pane -L } }
+bind-key -n 'M-j' if-shell "$is_vim" { send-keys M-j } { if-shell -F '#{pane_at_bottom}'  {} { select-pane -D } }
+bind-key -n 'M-k' if-shell "$is_vim" { send-keys M-k } { if-shell -F '#{pane_at_top}'     {} { select-pane -U } }
+bind-key -n 'M-l' if-shell "$is_vim" { send-keys M-l } { if-shell -F '#{pane_at_right}'   {} { select-pane -R } }
+
+# Remap resize
+unbind C-Up
+unbind C-Down
+unbind C-Left
+unbind C-Right
+unbind M-Up
+unbind M-Down
+unbind M-Left
+unbind M-Right
+bind -nr M-K resize-pane -U
+bind -nr M-J resize-pane -D
+bind -nr M-H resize-pane -L
+bind -nr M-L resize-pane -R
+
+##########
+# Design #
+##########
+
+# Borders
+set -g pane-border-style 'fg=colour12'
+set -g pane-active-border-style 'fg=colour12'
+
+# Statusbar
+set -g status-position bottom
+set -g status-justify left
+set -g status-style 'bg=colour235'
+set -g status-left ''
+
+# Command line and messages
+set -g message-style 'bg=color235'
+set -g display-time 4000
+
+# Tabs
+setw -g window-status-current-style 'bg=colour238 bold'
+setw -g window-status-current-format ' #[fg=color245]#I#[fg=colour250] #W '
+setw -g window-status-style 'bg=colour236'
+setw -g window-status-format ' #[fg=colour240]#I#[fg=colour245] #W '
+
+# Clock
+set -g status-right '#[fg=colour0,bg=colour240] %H:%M '
+set -g status-interval 10
+
+# Scroll number
+setw -g mode-style 'fg=colour240'