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el-exiftool is an elisp wrapper around [[http://www.sno.phy.queensu.ca/~phil/exiftool/][ExifTool]]. ExifTool supports
reading and writing metadata in various formats including [[wikipedia:Exif][EXIF]], [[wikipedia:Extensible_Metadata_Platform][XMP]]
and [[wikipedia:IPTC_Information_Interchange_Model][IPTC]].
There is a significant overhead in loading ExifTool for every command
to be exected. So, el-exiftool starts an ExifTool process in the
[[http://www.sno.phy.queensu.ca/~phil/exiftool/#performance][-stay_open mode]], and passes all commands to it.
* Functions
** High level functions
*** (el-exiftool-read FILE TAG...)
Read TAGS from FILE, return an alist mapping TAGS to values.
If a tag is not found, return an empty string "" as the value. If no
TAGS are specified, read all tags from FILE.
#+BEGIN_SRC emacs-lisp
(el-exiftool-read "test1.png" "ImageSize")
;; => '(("ImageSize" . "64x64"))
(el-exiftool-read "test1.png" "ImageSize" "Interlace")
;; => '(("ImageSize" . "64x64") ("Interlace" . "Noninterlaced"))
(el-exiftool-read "test1.png")
;; => '(("ExifToolVersion" . "10.20")
;; ("FileName" . "test1.png")
;; ("Directory" . ".")
;; ("FileSize" . "1234 bytes")
;; ("FileModifyDate" . "2017:02:19 00:31:36+05:30")
;; ("FileAccessDate" . "2017:02:22 00:21:53+05:30")
;; ("FileInodeChangeDate" . "2017:02:20 00:02:58+05:30")
;; ("FilePermissions" . "rw-r--r--")
;; ("FileType" . "PNG")
;; ("FileTypeExtension" . "png")
;; ("MIMEType" . "image/png")
;; ("ImageWidth" . "64") ...)
#+END_SRC
*** (el-exiftool-write FILE (TAG . VALUE)...)
Write tags to FILE.
The metadata to be written is specified as (TAG . VALUE) pairs.
Specifying the empty string "" for VALUE deletes that TAG.
#+BEGIN_SRC emacs-lisp
;; Set Marked to "True"
(el-exiftool-write "test1.png" '("Marked" . "True"))
;; Set Marked to "True", and Creator to "Foo"
(el-exiftool-write "test1.png"
'("Marked" . "True")
'("Creator" . "Foo"))
#+END_SRC
*** (el-exiftool-copy SOURCE DESTINATION &rest TAGS)
Copy TAGS from SOURCE file to DESTINATION file.
If no TAGS are specified, copy all tags from SOURCE.
#+BEGIN_SRC emacs-lisp
;; Copy all writable tags
(el-exiftool-copy "source.png" "destination.png")
;; Copy only the tag Marked
(el-exiftool-copy "source.png" "destination.png" "Marked")
;; Copy only the tags Marked and Creator
(el-exiftool-copy "source.png" "destination.png" "Marked" "Creator")
#+END_SRC
** Low level functions
*** (el-exiftool-command &rest ARGS)
Execute a command in the currently running exiftool process.
ARGS are arguments of the command to be run, as provided to the
exiftool command line application.
*** (el-exiftool-run)
Start an exiftool process if one is not already running.
If an exiftool process is already running, delete it, and create a new
one. Return the process object of the newly created process.
* License
el-exiftool is free software released under the terms of the [[https://www.gnu.org/licenses/gpl.txt][GNU
General Public License]], either version 3 of the License, or (at your
option) any later version.
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