Overwrite profile files more robustly.

[automanga.git] / manga / profile.py

diff --git a/manga/profile.py b/manga/profile.py
index 27bf86e..f304252 100644 (file)
--- a/manga/profile.py
+++ b/manga/profile.py
@@ -6,14 +6,40 @@ if home is None or not os.path.isdir(home):
     raise Exception("Could not find home directory for profile keeping")
 basedir = pj(home, ".manga", "profiles")
 
+class txfile(file):
+    def __init__(self, name, mode):
+        self.realname = name
+        self.tempname = name + ".new"
+        super(txfile, self).__init__(self.tempname, mode)
+
+    def close(self, abort=False):
+        super(txfile, self).close()
+        if abort:
+            os.unlink(self.tempname)
+        else:
+            os.rename(self.tempname, self.realname)
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *exc_info):
+        if exc_info[0] is not None:
+            self.close(True)
+        else:
+            self.close(False)
+
 def openwdir(nm, mode="r"):
+    ft = file
+    if mode == "W":
+        mode = "w"
+        ft = txfile
     if os.path.exists(nm):
-        return open(nm, mode)
+        return ft(nm, mode)
     if mode != "r":
         d = os.path.dirname(nm)
         if not os.path.isdir(d):
             os.makedirs(d)
-    return open(nm, mode)
+    return ft(nm, mode)
 
 def splitline(line):
     def bsq(c):
@@ -60,6 +86,13 @@ def splitline(line):
         ret.append(buf)
     return ret
 
+def splitlines(fp):
+    for line in fp:
+        cur = splitline(line)
+        if len(cur) < 1:
+            continue
+        yield cur
+
 def consline(*words):
     buf = ""
     for w in words:
@@ -99,17 +132,72 @@ class memmanga(manga):
     def loadprops(self):
         return {}
 
+class tagview(object):
+    def __init__(self, manga):
+        self.manga = manga
+        self.profile = manga.profile
+
+    def add(self, *tags):
+        mt = self.getall(self.profile)
+        ctags = mt.setdefault((self.manga.libnm, self.manga.id), set())
+        ctags |= set(tags)
+        self.save(self.profile, mt)
+
+    def remove(self, *tags):
+        mt = self.getall(self.profile)
+        ctags = mt.get((self.manga.libnm, self.manga.id), set())
+        ctags -= set(tags)
+        if len(ctags) < 1:
+            try:
+                del mt[self.manga.libnm, self.manga.id]
+            except KeyError:
+                pass
+        self.save(self.profile, mt)
+
+    def __iter__(self):
+        return iter(self.getall(self.profile).get((self.manga.libnm, self.manga.id), set()))
+
+    @staticmethod
+    def getall(profile):
+        ret = {}
+        try:
+            with profile.file("tags") as fp:
+                for words in splitlines(fp):
+                    libnm, id = words[0:2]
+                    tags = set(words[2:])
+                    ret[libnm, id] = tags
+        except IOError:
+            pass
+        return ret
+
+    @staticmethod
+    def save(profile, m):
+        with profile.file("tags", "W") as fp:
+            for (libnm, id), tags in m.iteritems():
+                fp.write(consline(libnm, id, *tags) + "\n")
+
+    @staticmethod
+    def bytag(profile, tag):
+        try:
+            with profile.file("tags") as fp:
+                for words in splitlines(fp):
+                    libnm, id = words[0:2]
+                    tags = words[2:]
+                    if tag in tags:
+                        yield profile.getmanga(libnm, id)
+        except IOError:
+            pass
+
 class filemanga(manga):
     def __init__(self, profile, libnm, id, path):
         self.path = path
         super(filemanga, self).__init__(profile, libnm, id)
+        self.tags = tagview(self)
 
     def loadprops(self):
         ret = {}
         with openwdir(self.path) as f:
-            for line in f:
-                words = splitline(line)
-                if len(words) < 1: continue
+            for words in splitlines(f):
                 if words[0] == "set" and len(words) > 2:
                     ret[words[1]] = words[2]
                 elif words[0] == "lset" and len(words) > 1:
@@ -117,7 +205,7 @@ class filemanga(manga):
         return ret
 
     def save(self):
-        with openwdir(self.path, "w") as f:
+        with openwdir(self.path, "W") as f:
             for key, val in self.props.iteritems():
                 if isinstance(val, str):
                     f.write(consline("set", key, val) + "\n")
@@ -134,10 +222,7 @@ class profile(object):
         ret = {}
         if os.path.exists(pj(self.dir, "map")):
             with openwdir(pj(self.dir, "map")) as f:
-                for ln in f:
-                    words = splitline(ln)
-                    if len(words) < 1:
-                        continue
+                for words in splitlines(f):
                     if words[0] == "seq" and len(words) > 1:
                         try:
                             seq = int(words[1])
@@ -151,7 +236,7 @@ class profile(object):
         return seq, ret
 
     def savemapping(self, seq, m):
-        with openwdir(pj(self.dir, "map"), "w") as f:
+        with openwdir(pj(self.dir, "map"), "W") as f:
             f.write(consline("seq", str(seq)) + "\n")
             for (libnm, id), num in m.iteritems():
                 f.write(consline("manga", libnm, id, str(num)) + "\n")
@@ -177,7 +262,7 @@ class profile(object):
     def setlast(self):
         if self.name is None:
             raise ValueError("profile at " + self.dir + " has no name")
-        with openwdir(pj(basedir, "last"), "w") as f:
+        with openwdir(pj(basedir, "last"), "W") as f:
             f.write(self.name + "\n")
 
     def getaliases(self):
@@ -192,7 +277,7 @@ class profile(object):
         return ret
 
     def savealiases(self, map):
-        with openwdir(pj(self.dir, "alias"), "w") as f:
+        with openwdir(pj(self.dir, "alias"), "W") as f:
             for nm, (libnm, id) in map.iteritems():
                 f.write(consline("alias", nm, libnm, id) + "\n")
 
@@ -207,6 +292,9 @@ class profile(object):
         aliases[nm] = libnm, id
         self.savealiases(aliases)
 
+    def bytag(self, tag):
+        return tagview.bytag(self, tag)
+
     @classmethod
     def byname(cls, name):
         if not name or name == "last" or name[0] == '.':