Add infobot example

Makefile

@@ -1,11 +1,14 @@
 CFLAGS = -Wall -Werror
-TARGETS = bot
+TARGETS = bot factoids
-TARGETS += extras/factoids
 
 all: $(TARGETS)
 
-extras/factoids: extras/factoids.o extras/cdb.o extras/cdbmake.o
+%: src/%
+	cp $< $@
+
+src/bot:
+src/factoids: src/factoids.o src/cdb.o src/cdbmake.o
 
 .PHONY: clean
 clean:
-	rm -f $(TARGETS) *.o extras/*.o
+	rm -f $(TARGETS) $(addprefix src/, $(TARGETS)) src/*.o

README

@@ -84,6 +84,16 @@ want, and you don't even need to restart anything to apply your changes,
 since a new handler is launched for each message.
 
 
+factoids
+========
+
+A program to maintain a low-overhead, read-optimized database file, which
+can store multiple values for each key.  This was written to help develop
+infobots, but can also be used for any other key/value store needed.
+
+The `infobot.py` program in `contrib/` has a simple infobot implementation.
+
+
 Caution
 =======
 
@@ -103,26 +113,6 @@ much more difficult to accidentally create an exploit.  Or create a new
 handler in Python, Ruby, etc.
 
 
-Extras
-======
-
-Included AT NO ADDITIONAL COST, in the `extras/` directory, are:
-
-
-newmont
--------
-
-A simple handler, written in lua.
-
-
-factoids
---------
-
-A program to maintain a low-overhead, read-optimized database file, which
-can store multiple values for each key.  This was written to help develop
-infobots, but can also be used for any other key/value store needed.
-
-
 Author
 ======
 

TODO

@@ -1 +0,0 @@
-

contrib/infobot.py

@@ -0,0 +1,48 @@
+#! /usr/bin/python
+
+##
+## Example of an infobot, using the provided helper.
+##
+
+import sys
+import os
+from subprocess import *
+
+db = "infobot.cdb"
+
+command = os.environ.get("command")
+sender = os.environ.get("sender")
+forum = os.environ.get("forum")
+text = os.environ.get("text")
+
+def factoids(*args):
+    cmd = ["./factoids"]
+    cmd.extend(args)
+    p = Popen(cmd, stdout=PIPE, stderr=STDOUT)
+    for bline in p.stdout:
+        line = bline.decode('utf-8')[:-1]
+        print("PRIVMSG %s :%s" % (forum, line))
+
+# Create db if it doesn't exist
+if not os.path.exists(db):
+    factoids("-n", db)
+
+if command == "_INIT_":
+    print("NICK infotest")
+    print("USER infotest infotest infotest: Infobot example")
+elif command == "001":
+    print("JOIN #infotest")
+elif command == "PRIVMSG":
+    if text[0] == "!":
+        txt = text[1:]
+        if " += " in txt:
+            key, val = txt.split(' += ', 1)
+            factoids("-a", val, db, key)
+        elif " -= " in txt:
+            key, glob = txt.split(' -= ', 1)
+            factoids("-r", glob, db, key)
+        else:
+            factoids("-l", db, txt)
+    else:
+        factoids(db, text)
+

contrib/newmont

@@ -2,12 +2,12 @@
 
 --
 -- A very simple bot which will join IRC, join #newmont, and 
--- respond to any messages with "strawberry" in them.  It also
+-- talk about strawberries.  It also has some naïve nickname
--- has some naïve nickname collision avoidance.
+-- collision avoidance.
 --
 -- This is a good place to start if you're not going to write
 -- your handler in lua.  If you *do* want to use lua, you should
--- take a look at bot.lua instead.
+-- think about how to make a better design :)
 --
 
 prefix = os.getenv("prefix")
@@ -21,17 +21,23 @@ io.stderr:write(">>> [" .. command .. "] " ..
         (forum or "-") .. " " .. 
         (text or "") .. "\n")
 
+--
 -- Our behavior depends on what the command is
+--
+
 if (command == "_INIT_") then
     -- bot sends this when it first starts up, so we can log in
     print("NICK nemont")
     print("USER newmont newmont newmont :Sample bot")
+ 
 elseif (command == "433") then
     -- Couldn't get the nickname we asked for
     print("NICK bot_" .. (os.time() % 500))
+ 
 elseif (command == "001") then
     -- IRC server sends this after successful login
     print("JOIN #newmont")
+
 elseif (command == "PRIVMSG") then
     -- Somebody said something!
     if (text:find("strawberry")) then

src/cdb.c

@@ -129,7 +129,10 @@ cdb_find(struct cdb_ctx *ctx, char *key, size_t keylen)
     fseek(ctx->f, (ctx->hash_val % 256) * 8, SEEK_SET);
     ctx->hash_pos = read_u32le(ctx->f);
     ctx->hash_len = read_u32le(ctx->f);
-    ctx->entry = (ctx->hash_val / 256) % ctx->hash_len;
+
+    if (ctx->hash_len > 0) {
+        ctx->entry = (ctx->hash_val / 256) % ctx->hash_len;
+    }
 }
 
 uint32_t
@@ -140,7 +143,7 @@ cdb_next(struct cdb_ctx *ctx, char *buf, size_t buflen)
     uint32_t klen;
     uint32_t dlen;
 
-    for (;;) {
+    for (; ctx->hash_len > 0;) {
         fseek(ctx->f, ctx->hash_pos + (ctx->entry * 8), SEEK_SET);
         ctx->entry = (ctx->entry + 1) % ctx->hash_len;