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use Bos for making thumbnail with convert

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Swrup 2022-03-21 03:17:08 +01:00
parent d9c12b1d9a
commit cf1b4f4e62
1 changed files with 19 additions and 32 deletions
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51
src/babillard.ml
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@ -287,39 +287,26 @@ let clean_image image =
else Ok (name, alt, content) else Ok (name, alt, content)
let make_thumbnail content = let make_thumbnail content =
try let open Bos in
let filename = (* jpp *)
Filename.concat "/tmp" (Uuidm.to_string (Uuidm.v4_gen random_state ())) let ( let* ) o f =
in Result.fold ~ok:f ~error:(function `Msg s -> Result.error s) o
let thumb_filename = filename ^ "_small" in in
let oc = open_out filename in
let fmt = Format.formatter_of_out_channel oc in
Format.fprintf fmt "%s" content;
close_out oc;
let command =
Format.sprintf
"convert -define jpeg:size=700x700 %s -auto-orient -thumbnail \
'300x300>' -unsharp 0x.5 -format jpg %s"
filename thumb_filename
in
let resize_exit_code = Sys.command command in
if resize_exit_code <> 0 then
Error
(Format.sprintf "thumbnail: resize command failed with exit code: %d"
resize_exit_code )
else
let ic = open_in thumb_filename in
let thumbnail = really_input_string ic (in_channel_length ic) in
close_in ic;
let delete = Format.sprintf "rm %s; rm %s" filename thumb_filename in let* image_file = OS.File.tmp "%s" in
let delete_exit_code = Sys.command delete in let* thumb_file = OS.File.tmp "%s_thumb" in
if delete_exit_code <> 0 then let* () = OS.File.write image_file content in
Error let cmd =
(Format.sprintf "thumbnail: delete command failed with exit code: %d" Cmd.(
delete_exit_code ) v "convert" % "-define" % "jpeg:size=700x700" % p image_file
else Ok thumbnail % "-auto-orient" % "-thumbnail" % "300x300>" % "-unsharp" % "0x.5"
with Sys_error e -> Error e % "-format" % "jpg" % p thumb_file)
in
let* () = OS.Cmd.run cmd in
let* thumbnail = OS.File.read thumb_file in
let* () = OS.File.delete image_file in
let* () = OS.File.delete thumb_file in
Ok thumbnail
(*TODO switch to markdown !*) (*TODO switch to markdown !*)
(* insert html into the comment, and keep tracks of citations : (* insert html into the comment, and keep tracks of citations :