Replace "TODO text" for yadm config (#46)

test/106_accept_config.bats

@@ -13,14 +13,18 @@ setup() {
 }
 
 @test "Command 'config' (no parameters)" {
-  skip
   echo "
     When 'config' command is provided alone,
     Produce instructions about supported configuration options
     Exit with 1
   "
 
-  #; TODO: This has not been implemented
+  #; run config
+  run "${T_YADM_Y[@]}" config
+
+  #; validate status and output
+  [ $status -eq 0 ]
+  [[ "$output" =~ Please\ read\ the\ CONFIGURATION\ section ]]
 }
 
 @test "Command 'config' (read missing)" {

yadm

@@ -277,7 +277,25 @@ function config() {
 
   if [ -z "$*" ] ; then
     #; with no parameters, provide some helpful documentation
-    echo TODO: Print help about available yadm configurations
+    cat << EOF
+yadm supports the following configurations:
+
+  alt.class
+  alt.host
+  alt.os
+  alt.user
+  yadm.auto-alt
+  yadm.auto-perms
+  yadm.git-program
+  yadm.gpg-perms
+  yadm.gpg-program
+  yadm.gpg-recipient
+  yadm.ssh-perms
+
+Please read the CONFIGURATION section in the man
+page for more details about configurations, and
+how to adjust them.
+EOF
   else
     #; operate on the yadm configuration file
     git config --file="$(mixed_path "$YADM_CONFIG")" "$@"