Add bash completion module

mkit/config.ini

 [lists]
 
     group = bin
+    group = etc_bc
     group = libexec
     group = share
 
     libexec = [ENV:PREFIX]/libexec/saturnin
     share   = [ENV:PREFIX]/share/saturnin
     etc     = /etc/saturnin
+    etc_bc  = /etc/bash_completion.d
 
 [vars]
     __SATURNIN_CACHE_HOME__     = $HOME/.local/share/saturnin
 [files:bin]
     src/bin/saturnin                        = saturnin
 
+[files:etc_bc]
+    src/complete.bash                       = saturnin.bash
+
 [files:libexec]
     src/libexec/saturnin-au                 = saturnin-au
     src/libexec/saturnin-clip               = saturnin-clip

src/complete.bash

+
+__saturnin() {
+    local cur prev opts
+    COMPREPLY=()
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    prev="${COMP_WORDS[COMP_CWORD-1]}"
+    opts="--help --verbose --debug --version --version-semver"
+
+    case "$cur" in
+        --*)
+            COMPREPLY=(
+                $(compgen -W "$opts" -- ${cur})
+            )
+            ;;
+        *)
+            COMPREPLY=(
+                $(compgen -W "$(saturnin _ls_subcommands)" ${cur})
+            )
+    esac
+}
+
+complete -F __saturnin saturnin