added info on recent additions to interface

README.md

@@ -8,6 +8,31 @@ Not everything stated here is implemented.
 
 Features: 
 
+* Declarative and usual interfaces. 
+
+    Declarative: 
+
+    ```lua
+    parser:argument "input"
+       :description "Path to input file. "
+       :convert(io.open)
+    parser:option "-v" "--verbose"
+       :description "Sets logging level. "
+       :count "*"
+    ```
+
+    Usual: 
+
+    ```lua
+    parser:argument("input", {
+       description = "Path to input file. ",
+       convert = io.open
+    })
+    parser:option("-v", "--verbose", {
+       description  = "Sets logging level. ",
+       count = "*"
+    })
+    ```
 * Parses: 
     * Short options(e.g. `-q`); 
     * Combined short options(e.g. `-zx`); 
@@ -21,14 +46,12 @@ Features:
     Example: 
 
     ```lua
-    parser:option "-p" "--pair" {
-       count = "*",
-       args = 2
-    }
+    parser:option "-p" "--pair"
+       :count "*"
+       :args(2)
 
-    parser:flag "-v" "--verbose" {
-       count = "*"
-    }
+    parser:flag "-v" "--verbose"
+       :count "*"
 
     local args = parser:parse{"--pair", "Alice", "Bob", "-p", "Emma", "John", "-vvv"}
     -- args = {
@@ -41,5 +64,5 @@ Features:
     ```
 
 * Supports default values and automatic conversions for arguments. 
-* [___NYI___] Automatically generates error, help and usage messages. 
+* Automatically generates error, usage  and help(__NYI__) messages. 
 * Supports commands(e.g. in [git](http://git-scm.com/) CLI `add`, `commit`, `push`, etc. are commands). Each command has its own set of options and arguments. 

spec/usage_spec.lua

@@ -9,15 +9,13 @@ describe("tests related to usage message generation", function()
    it("creates correct usage message for arguments", function()
       local parser = argparse.parser "foo"
       parser:argument "first"
-      parser:argument "second-and-third" {
-         args = 2
-      }
-      parser:argument "maybe-fourth" {
-         args = "?"
-      }
-      parser:argument "others" {
-         args = "*"
-      }
+      parser:argument "second-and-third"
+         :args "2"
+      parser:argument "maybe-fourth"
+         :args "?"
+      parser:argument "others"
+         :args "*"
+
       assert.equal(
          [=[Usage: foo <first> <second-and-third> <second-and-third> [<maybe-fourth>] [<others>] ...]=],
          parser:prepare():get_usage()
@@ -27,11 +25,11 @@ describe("tests related to usage message generation", function()
    it("creates correct usage message for options", function()
       local parser = argparse.parser "foo"
       parser:flag "-q" "--quiet"
-      parser:option "--from" {
-         count = 1,
-         target = "server"
-      }
+      parser:option "--from"
+         :count "1"
+         :target "server"
       parser:option "--config"
+
       assert.equal(
          [=[Usage: foo [-q] --from <server> [--config <config>]]=],
          parser:prepare():get_usage()
@@ -43,6 +41,7 @@ describe("tests related to usage message generation", function()
       parser:flag "-q" "--quiet"
       local run = parser:command "run"
       run:option "--where"
+
       assert.equal(
          [=[Usage: foo [-q] [<command>] ...]=],
          parser:prepare():get_usage()
@@ -51,10 +50,10 @@ describe("tests related to usage message generation", function()
 
    describe("usage generation can be customized", function()
       it("uses message provided by user", function()
-         local parser = argparse.parser "foo" {
-            usage = "Usage: obvious"
-         }
+         local parser = argparse.parser "foo"
+            :usage "Usage: obvious"
          parser:flag "-q" "--quiet"
+
          assert.equal(
             [=[Usage: obvious]=],
             parser:prepare():get_usage()
@@ -63,9 +62,9 @@ describe("tests related to usage message generation", function()
 
       it("uses per-option message provided by user", function()
          local parser = argparse.parser "foo"
-         parser:flag "-q" "--quiet" {
-            usage = "[-q | --quiet]"
-         }
+         parser:flag "-q" "--quiet"
+            :usage "[-q | --quiet]"
+
          assert.equal(
             [=[Usage: foo [-q | --quiet]]=],
             parser:prepare():get_usage()
@@ -74,10 +73,10 @@ describe("tests related to usage message generation", function()
 
       it("uses argnames provided by user", function()
          local parser = argparse.parser "foo"
-         parser:argument "inputs" {
-            args = "1-2",
-            argname = "<input>"
-         }
+         parser:argument "inputs"
+            :args "1-2"
+            :argname "<input>"
+
          assert.equal(
             [=[Usage: foo <input> [<input>]]=],
             parser:prepare():get_usage()