fallback to timg if chafa fails to load an image

CHANGELOG

@@ -5,6 +5,7 @@
 
 - netcache : solve an infinite gemini loop with code 6X (see also bug #31)
 - ansicat: added support for <video> HTML-element
+- ansicat: if chafa fails to load an image, fallback to timg is available
 
 ## 2.1 - December 15th 2023
 - freshly updated gemtext/rss links are highlighted ("new_link" theme option)

ansicat.py

@@ -106,7 +106,8 @@ def inline_image(img_file,width):
     if not os.path.exists(img_file):
         return ""
     #Chafa is faster than timg inline. Let use that one by default
-    inline = None
+    #But we keep a list of "inlines" in case chafa fails
+    inlines = []
     ansi_img = ""
     #We avoid errors by not trying to render non-image files
     if shutil.which("file"):
@@ -120,32 +121,39 @@ def inline_image(img_file,width):
             if hasattr(img_obj,"n_frames") and img_obj.n_frames > 1:
                 # we remove all frames but the first one
                 img_obj.save(img_file,format="gif",save_all=False)
-            inline = "chafa --bg white -s %s -f symbols"
+            inlines.append("chafa --bg white -s %s -f symbols")
         elif _NEW_CHAFA:
-            inline = "chafa --bg white -t 1 -s %s -f symbols --animate=off"
-    if not inline and _NEW_TIMG:
-        inline = "timg --frames=1 -p q -g %sx1000"
-    if inline:
-        cmd = inline%width + " %s"
+            inlines.append("chafa --bg white -t 1 -s %s -f symbols --animate=off")
+    if _NEW_TIMG:
+        inlines.append("timg --frames=1 -p q -g %sx1000")
+    image_success = False
+    while not image_success and len(inlines)>0:
+        cmd = inlines.pop(0)%width + " %s"
         try:
             ansi_img = run(cmd, parameter=img_file)
+            image_succes = True
         except Exception as err:
-            ansi_img = "***IMAGE ERROR: wrong or undisplayable picture***\n" %err
+            ansi_img = "***IMAGE ERROR***\n%s…\n…%s" %(str(err)[:50],str(err)[-50:])
     return ansi_img
 
 def terminal_image(img_file):
     #Render by timg is better than old chafa.
     # it is also centered
-    cmd = None
+    cmds = []
     if _NEW_CHAFA:
-        cmd = "chafa -C on -d 0 --bg white -t 1 -w 1"
-    elif _NEW_TIMG:
-        cmd = "timg --loops=1 -C"
+        cmds.append("chafa -C on -d 0 --bg white -t 1 -w 1")
     elif _HAS_CHAFA:
-        cmd = "chafa -d 0 --bg white -t 1 -w 1"
-    if cmd:
-        cmd = cmd + " %s"
-        run(cmd, parameter=img_file, direct_output=True)
+        cmds.append("chafa -d 0 --bg white -t 1 -w 1")
+    if _NEW_TIMG:
+        cmds.append("timg --loops=1 -C")
+    image_success = False
+    while not image_success and len(cmds) > 0:
+        cmd = cmds.pop(0) + " %s"
+        try:
+            run(cmd, parameter=img_file, direct_output=True)
+            image_success = True
+        except Exception as err:
+            print(err)
 
 
 # First, we define the different content->text renderers, outside of the rest