Offer to install SDKMAN! if not already installed.

Fixes issue #26

Also:

 - Change language in README to clarify that
   SDKMAN! is not included.
 - Polishes to `.editorconfig`.

.editorconfig

@@ -1,5 +1,12 @@
+root = true
+
 [*]
+charset = utf-8
+end_of_line = lf
 indent_style = space
-indent_size = 2
+indent_size = 4
 trim_trailing_whitespace = true
 insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

README.md

@@ -2,8 +2,8 @@
 
 [![Build Status][travis-badge]][travis-link]
 
-Makes command `sdk` from [SDKMAN!] available in fish.
-Also provides auto-completion and adds binaries from installed SDKs to the PATH.
+Makes command `sdk` from [SDKMAN!] usable from fish, including auto-completion.
+Also adds binaries from installed SDKs to the PATH.
 
 Tested with fish 2.7.1 and 3.0.2, and SDKMAN! 5.7.3.
 
@@ -15,7 +15,10 @@ With [fisher] (install separately):
 fisher add reitzig/sdkman-for-fish
 ```
 
-_Note:_ Only compatible with fisher v3 upwards; v2 is no longer supported.
+_Note:_ 
+
+ - Only compatible with fisher v3 upwards; v2 is no longer supported.
+ - You have to install [SDKMAN!] separately.
 
 ## Usage
 

functions/sdk.fish

@@ -1,9 +1,36 @@
-# Guard: SDKMAN! needs to be installed
-if not test -f "$__fish_sdkman_init"
-  exit 0
-end
-
-# Declare the sdk command for fish
 function sdk -d "Manage SDKs"
-    __fish_sdkman_run_in_bash "source \"$__fish_sdkman_noexport_init\" && sdk $argv"
+    # Guard: SDKMAN! needs to be installed
+    if not test -f "$__fish_sdkman_init"
+        # Propose to install SDKMAN!
+
+        function read_confirm
+            while true
+                read -l -P "$argv[1] [y/N] " confirm
+
+                switch $confirm
+                case Y y
+                    return 0
+                case '' N n
+                    return 1
+                end
+            end
+        end
+
+        if read_confirm "You don't seem to have SDKMAN! installed. Install now?"
+            if not which curl > /dev/null
+                echo "curl required"
+                return 1
+            end
+            if not which bash > /dev/null
+                echo "bash required"
+                return 1
+            end
+
+            curl -s "https://get.sdkman.io" | bash | sed '/All done!/q'
+            echo "Please open a new terminal/shell to load SDKMAN!"
+        end
+    else
+        # Declare the _actual_ sdk command for fish
+        __fish_sdkman_run_in_bash "source \"$__fish_sdkman_noexport_init\" && sdk $argv"
+    end
 end

test/reinitialize.fish

@@ -23,3 +23,5 @@ begin
       exit 1
     end
 end
+
+# TODO: add test that fails if `test` in conf.d/sdk.fish:80 errors (cf issue #28 et al.)