'eos-application-manifest' tool with subcommands

This is the framework for an 'eos-application-manifest' tool with
subcommands as in git. Currently the 'help' and 'version' subcommands
are implemented.

[endlessm/eos-sdk#152]

1 files changed, 47 insertions, 0 deletions

diff --git a/tools/eos-application-manifest/commands/help.js b/tools/eos-application-manifest/commands/help.js
new file mode 100644
index 0000000..d991b85
--- /dev/null
+++ b/tools/eos-application-manifest/commands/help.js
@@ -0,0 +1,47 @@
+// Copyright 2013 Endless Mobile, Inc.
+
+const System = imports.system;
+
+function execute(args) {
+    if (args.length === 0) {
+        print('Usage: %s <command> [<args>]\n'.format(System.programInvocationName));
+        // Query all available subcommands
+        let oldSearchPath = imports.searchPath;
+        imports.searchPath = [commandSearchPath]; // only pick up subcommands
+        let commandsList = [];
+        for (let commandName in imports) {
+            commandsList.push(commandName);
+        }
+        imports.searchPath = oldSearchPath;
+
+        // Print out summary for each subcommand
+        if (commandsList.length === 0)
+            return;
+        print('Summaries of commands:');
+        let maxWidth = commandsList.reduce(function (prev, curr) {
+            return Math.max(curr.length, prev.length);
+        });
+        commandsList.forEach(function (commandName) {
+            let command = imports[commandName];
+            let summary;
+            if (typeof command.summary == 'undefined')
+                summary = 'No information available';
+            else
+                summary = command.summary();
+            print('  %%%ds - %%s'.format(maxWidth).format(commandName, summary));
+        });
+        return;
+    }
+
+    const command = imports[args[0]];
+    command.help();
+}
+
+function summary() {
+    return 'Displays help information about a subcommand';
+}
+
+function help() {
+    print("Displays help information about a subcommand.\n\
+Try '%s help <command-name>'.".format(System.programInvocationName));
+}