Implemented helptext

This documents program function, description, and basic usage with the
two currently available switches, -r,--recipient and -h,--help.

2 files changed, 23 insertions, 1 deletions

diff --git a/TODO.adoc b/TODO.adoc
index 35fc661..aaf3b38 100644
--- a/TODO.adoc
+++ b/TODO.adoc
@@ -13,4 +13,4 @@ Implement
 * [x] Recipient addition beyond the list already in the file
 * [ ] Recipient removal from existing file
 * [ ] New file creation (at least one recipient required)
-* [ ] Helptext
+* [x] Helptext
diff --git a/src/main.c b/src/main.c
index a5afe97..ca0df5c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -31,6 +31,25 @@ void system_edit(char* file) {
 }
 
 
+void usage() {
+  const char* helptext = 
+  "GPGEdit is an editor wrapper for GPG encrypted files. It will decrypt the\n"
+  "specified text file to a secure location in memory, and open the specified\n"
+  "editor. Upon closing the editor, the unencrypted copy in memory is\n"
+  "re-encrypted, written back to the original encrypted location, and the\n"
+  "decrypted copy is deleted from memory.\n\n"
+  "NOTE: If power is lost while editing a file, all changes will be lost as\n"
+  "they are stored exclusively in memory.\n"
+  "\nUsage:\n\n"
+  "  gpgedit [-r user@host] <file.gpg>\n"
+  "\nArguments:\n"
+  "  -r,--recipient   Adds a recipient key to the encrypted output\n"
+  "  -h,--help        Print this help text\n";
+
+  printf("%s\n", helptext);
+}
+
+
 void parseargs(int argc, char* argv[], struct gpgedit_config* config) {
   int i = 1;
 
@@ -39,6 +58,9 @@ void parseargs(int argc, char* argv[], struct gpgedit_config* config) {
       i++;
       //printf("Adding recipient %s\n", argv[i]);
       strll_add(config->recipients, argv[i]);
+    } else if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
+      usage();
+      exit(0);
     } else {
       gpgedit_config_file_set(config, argv[i]);
     }