From 42f43db2b1b2e1a01360d9538d025aefaeb46860 Mon Sep 17 00:00:00 2001
From: Roberto Alsina <roberto.alsina@gmail.com>
Date: Fri, 5 Jul 2024 10:23:46 -0300
Subject: [PATCH] Basic runtime template implementation

---
 examples/hello_crystal/README.md       |  3 ++
 runtimes/crystal/README.md             |  4 +++
 runtimes/crystal/template/README.md.j2 | 11 ++++++
 runtimes/crystal/template/funko.cr     | 16 +++++++++
 runtimes/crystal/template/funko.yml    |  2 ++
 src/commands/new.cr                    | 47 +++++++++++++++++++++++++-
 6 files changed, 82 insertions(+), 1 deletion(-)
 create mode 100644 examples/hello_crystal/README.md
 create mode 100644 runtimes/crystal/README.md
 create mode 100644 runtimes/crystal/template/README.md.j2
 create mode 100644 runtimes/crystal/template/funko.cr
 create mode 100644 runtimes/crystal/template/funko.yml

diff --git a/examples/hello_crystal/README.md b/examples/hello_crystal/README.md
new file mode 100644
index 0000000..95081fc
--- /dev/null
+++ b/examples/hello_crystal/README.md
@@ -0,0 +1,3 @@
+# README
+
+This is the readme for people trying to *use* this runtime.
\ No newline at end of file
diff --git a/runtimes/crystal/README.md b/runtimes/crystal/README.md
new file mode 100644
index 0000000..63918c9
--- /dev/null
+++ b/runtimes/crystal/README.md
@@ -0,0 +1,4 @@
+# README
+
+This is the readme for people wanting to change this runtime,
+not for people trying to use it
\ No newline at end of file
diff --git a/runtimes/crystal/template/README.md.j2 b/runtimes/crystal/template/README.md.j2
new file mode 100644
index 0000000..0e8aef8
--- /dev/null
+++ b/runtimes/crystal/template/README.md.j2
@@ -0,0 +1,11 @@
+# Readme for {{name | title}}
+
+This is a funko using the Crystal runtime for [FaaSO](https://git.ralsina.me/ralsina/faaso)
+
+## What is {{name | title}}
+
+Write here what it is
+
+## How to use {{name | title}}
+
+And so on.
diff --git a/runtimes/crystal/template/funko.cr b/runtimes/crystal/template/funko.cr
new file mode 100644
index 0000000..75828c0
--- /dev/null
+++ b/runtimes/crystal/template/funko.cr
@@ -0,0 +1,16 @@
+require "kemal"
+
+# This is a kemal app, you can add handlers, middleware, etc.
+
+# A basic hello world get endpoint
+get "/" do
+  "Hello World Crystal!"
+end
+
+# The `/ping/` endpoint is configured in the container as a healthcheck
+# You can make it better by checking that your database is responding
+# or whatever checks you think are important
+#
+get "/ping/" do
+  "OK"
+end
diff --git a/runtimes/crystal/template/funko.yml b/runtimes/crystal/template/funko.yml
new file mode 100644
index 0000000..44354bb
--- /dev/null
+++ b/runtimes/crystal/template/funko.yml
@@ -0,0 +1,2 @@
+name: hello
+runtime: crystal
diff --git a/src/commands/new.cr b/src/commands/new.cr
index 44b6e57..628bd0b 100644
--- a/src/commands/new.cr
+++ b/src/commands/new.cr
@@ -22,15 +22,60 @@ module Faaso
           return 0
         end
 
-        # Create folder with a preconfigured funko for this runtime
+        # Get runtime template files list
+        template_base = "" 
+        template_files = [] of String
         if @@known.includes? "./runtimes/#{runtime}"
           Log.info { "Using known runtime #{runtime}" }
+          template_base = "./runtimes/#{runtime}/template"
+          template_files = @@filelist.select { |f| f.starts_with? template_base }
         elsif File.exists? runtime
           Log.info { "Using directory #{runtime} as runtime" }
+          template_base = "#{runtime}/template"
+          template_files = Dir.glob("#{template_base}/**/*")
         else
           Log.error { "Can't find runtime #{runtime}" }
           return 1
         end
+
+        pp! template_files
+
+        # Create new folder
+        if Dir.exists? folder
+          Log.error { "Folder #{folder} already exists" }
+          return 1
+        end
+
+        Dir.mkdir_p folder
+
+        template_files.each do |f|
+          content = IO::Memory.new
+          # We need to use RUCKSACK_MODE=0 so it
+          # fallbacks to the filesystem
+          rucksack(f).read(content)
+          if content.nil?
+            Log.error { "Can't find file #{f}" }
+            return 1
+          end
+
+          # f is like "#{template_base}/foo"
+          # dst is like #{folder}/foo
+          dst = Path[folder] / Path[f].relative_to(template_base)
+          # Render templated files
+          if f.ends_with? ".j2"
+            dst = dst.sibling(dst.stem)
+            Log.info { "Creating file #{dst} from #{f}" }
+            File.open(dst, "w") do |file|
+              file << Crinja.render(content.to_s, {"name" => Path[folder].basename})
+            end
+          else  # Just copy the file
+            Log.info { "Creating file #{dst} from #{f}" }
+            File.open(dst, "w") do |file|
+              file << content.to_s
+            end
+          end
+        end
+
         0
       end
     end