~bzg/worg

0d99cfb6fccf87a92b31d430ab89562e8b407b73 — Tim Cross 13 days ago 8ff08c0
Update and cleanup of LoB file

- Add exmaple elispgantt test table and description
- Fix some old tblname and headers arguments
- Fix some missing quoting in exmaple blocks
- fix block indentation
- add missing name values

Still a bit of cleanup work required, but a start...
1 files changed, 294 insertions(+), 260 deletions(-)

M library-of-babel.org
M library-of-babel.org => library-of-babel.org +294 -260
@@ 29,7 29,7 @@ A collection of simple utility functions:

#+name: echo
#+begin_src emacs-lisp :var input="echo'd"
  input
input
#+end_src

* File I/O


@@ 42,13 42,13 @@ file as either a table or a string.

#+name: read
#+begin_src emacs-lisp :var file="" :var format=""
  (if (string= format "csv")
      (with-temp-buffer
        (org-table-import (expand-file-name file) nil)
        (org-table-to-lisp))
(if (string= format "csv")
    (with-temp-buffer
      (insert-file-contents (expand-file-name file))
      (buffer-string)))
      (org-table-import (expand-file-name file) nil)
      (org-table-to-lisp))
  (with-temp-buffer
    (insert-file-contents (expand-file-name file))
    (buffer-string)))
#+end_src

Write =data= to a file at =file=.  If =data= is a list, then write it


@@ 56,14 56,14 @@ as a table in traditional Org-mode table syntax.

#+name: write
#+begin_src emacs-lisp :var data="" :var file="" :var ext='()
  (flet ((echo (r) (if (stringp r) r (format "%S" r))))
    (with-temp-file file
      (case (and (listp data)
                 (or ext (intern (file-name-extension file))))
        ('tsv (insert (orgtbl-to-tsv data '(:fmt echo))))
        ('csv (insert (orgtbl-to-csv data '(:fmt echo))))
        (t    (org-babel-insert-result data)))))
  nil
(flet ((echo (r) (if (stringp r) r (format "%S" r))))
  (with-temp-file file
    (case (and (listp data)
               (or ext (intern (file-name-extension file))))
      ('tsv (insert (orgtbl-to-tsv data '(:fmt echo))))
      ('csv (insert (orgtbl-to-csv data '(:fmt echo))))
      (t    (org-babel-insert-result data)))))
nil
#+end_src

** Remote files


@@ 74,18 74,18 @@ Read local or remote file in [[http://www.json.org/][json]] format into emacs-li

#+name: json
#+begin_src emacs-lisp :var file='() :var url='()
  (require 'json)
  (cond
   (file
    (org-babel-with-temp-filebuffer file
      (goto-char (point-min))
      (json-read)))
   (url
    (require 'w3m)
    (with-temp-buffer
      (w3m-retrieve url)
      (goto-char (point-min))
      (json-read))))
(require 'json)
(cond
 (file
  (org-babel-with-temp-filebuffer file
    (goto-char (point-min))
    (json-read)))
 (url
  (require 'w3m)
  (with-temp-buffer
    (w3m-retrieve url)
    (goto-char (point-min))
    (json-read))))
#+end_src

*** Google docs


@@ 103,17 103,17 @@ for spreadsheets.

#+name: gdoc-read
#+begin_src emacs-lisp :var title="example" :var format="csv"
  (let* ((file (concat title "." format))
         (cmd (format "google docs get --format %S --title %S" format title)))
    (message cmd) (message (shell-command-to-string cmd))
    (prog1 (if (string= format "csv")
               (with-temp-buffer
                 (org-table-import (shell-quote-argument file) '(4))
                 (org-table-to-lisp))
(let* ((file (concat title "." format))
       (cmd (format "google docs get --format %S --title %S" format title)))
  (message cmd) (message (shell-command-to-string cmd))
  (prog1 (if (string= format "csv")
             (with-temp-buffer
               (insert-file-contents (shell-quote-argument file))
               (buffer-string)))
      (delete-file file)))
               (org-table-import (shell-quote-argument file) '(4))
               (org-table-to-lisp))
           (with-temp-buffer
             (insert-file-contents (shell-quote-argument file))
             (buffer-string)))
    (delete-file file)))
#+end_src

For example, a line like the following can be used to read the


@@ 139,27 139,30 @@ normal document.

#+name: gdoc-write
#+begin_src emacs-lisp :var title="babel-upload" :var data=fibs(n=10) :results silent
  (let* ((format (if (listp data) "csv" "txt"))
         (tmp-file (make-temp-file "org-babel-google-doc" nil (concat "." format)))
         (cmd (format "google docs upload --title %S %S" title tmp-file)))
    (with-temp-file tmp-file
      (insert
       (if (listp data)
           (orgtbl-to-csv
            data '(:fmt (lambda (el) (if (stringp el) el (format "%S" el)))))
         (if (stringp data) data (format "%S" data)))))
    (message cmd)
    (prog1 (shell-command-to-string cmd) (delete-file tmp-file)))
(let* ((format (if (listp data) "csv" "txt"))
       (tmp-file (make-temp-file "org-babel-google-doc" nil (concat "." format)))
       (cmd (format "google docs upload --title %S %S" title tmp-file)))
  (with-temp-file tmp-file
    (insert
     (if (listp data)
         (orgtbl-to-csv
          data '(:fmt (lambda (el) (if (stringp el) el (format "%S" el)))))
       (if (stringp data) data (format "%S" data)))))
  (message cmd)
  (prog1 (shell-command-to-string cmd) (delete-file tmp-file)))
#+end_src

example usage
: #+name: fibs
: #+begin_src emacs-lisp :var n=8
: (flet ((fib (m) (if (< m 2) 1 (+ (fib (- m 1)) (fib (- m 2))))))
:   (mapcar (lambda (el) (list el (fib el))) (number-sequence 0 (- n 1))))
: #+end_src
:
: #+call: gdoc-write(title="fibs", data=fibs(n=10))

#+begin_example
,#+name: fibs
,#+begin_src emacs-lisp :var n=8
(flet ((fib (m) (if (< m 2) 1 (+ (fib (- m 1)) (fib (- m 2))))))
  (mapcar (lambda (el) (list el (fib el))) (number-sequence 0 (- n 1))))
,#+end_src

,#+call: gdoc-write(title="fibs", data=fibs(n=10))
#+end_example

* Plotting code



@@ 192,12 195,12 @@ plot(data)

#+name: headline
#+begin_src emacs-lisp :var headline="" :var file='()
  (save-excursion
    (when file (get-file-buffer file))
    (org-open-link-from-string (org-make-link-string headline))
    (save-restriction
      (org-narrow-to-subtree)
      (buffer-string)))
(save-excursion
  (when file (get-file-buffer file))
  (org-open-link-from-string (org-make-link-string headline))
  (save-restriction
    (org-narrow-to-subtree)
    (buffer-string)))
#+end_src

#+call: headline(headline="Headline references")


@@ 229,34 232,34 @@ optional.

#+name: booktabs
#+begin_src emacs-lisp :var table='((:head) hline (:body)) :var align='() :var env="tabular" :var width='() :noweb yes :results latex
  (flet ((to-tab (tab)
                 (orgtbl-to-generic
                  (mapcar (lambda (lis)
                            (if (listp lis)
                                (mapcar (lambda (el)
                                          (if (stringp el)
                                              el
                                            (format "%S" el))) lis)
                              lis)) tab)
                  (list :lend " \\\\" :sep " & " :hline "\\hline"))))
    (org-fill-template
     "
  \\begin{%env}%width%align
  \\toprule
  %table
  \\bottomrule
  \\end{%env}\n"
     (list
      (cons "env"       (or env "table"))
      (cons "width"     (if width (format "{%s}" width) ""))
      (cons "align"     (if align (format "{%s}" align) ""))
      (cons "table"
            ;; only use \midrule if it looks like there are column headers
            (if (equal 'hline (second table))
                (concat (to-tab (list (first table)))
                        "\n\\midrule\n"
                        (to-tab (cddr table)))
              (to-tab table))))))
(flet ((to-tab (tab)
               (orgtbl-to-generic
                (mapcar (lambda (lis)
                          (if (listp lis)
                              (mapcar (lambda (el)
                                        (if (stringp el)
                                            el
                                          (format "%S" el))) lis)
                            lis)) tab)
                (list :lend " \\\\" :sep " & " :hline "\\hline"))))
  (org-fill-template
   "
\\begin{%env}%width%align
\\toprule
%table
\\bottomrule
\\end{%env}\n"
   (list
    (cons "env"       (or env "table"))
    (cons "width"     (if width (format "{%s}" width) ""))
    (cons "align"     (if align (format "{%s}" align) ""))
    (cons "table"
          ;; only use \midrule if it looks like there are column headers
          (if (equal 'hline (second table))
              (concat (to-tab (list (first table)))
                      "\n\\midrule\n"
                      (to-tab (cddr table)))
            (to-tab table))))))
#+end_src

*** longtable


@@ 278,32 281,32 @@ are optional.

#+name: longtable
#+begin_src emacs-lisp :var table='((:table)) :var align='() :var width='() :var hline="\\hline" :var firsthead='() :var head='() :var foot='() :var lastfoot='() :noweb yes :results latex
  (org-fill-template
   "
  \\begin{longtable}%width%align
  %firsthead
  %head
  %foot
  %lastfoot

  %table
  \\end{longtable}\n"
   (list
    (cons "width"     (if width (format "{%s}" width) ""))
    (cons "align"     (if align (format "{%s}" align) ""))
    (cons "firsthead" (if firsthead (concat firsthead "\n\\endfirsthead\n") ""))
    (cons "head"      (if head (concat head "\n\\endhead\n") ""))
    (cons "foot"      (if foot (concat foot "\n\\endfoot\n") ""))
    (cons "lastfoot"  (if lastfoot (concat lastfoot "\n\\endlastfoot\n") ""))
    (cons "table" (orgtbl-to-generic
                   (mapcar (lambda (lis)
                             (if (listp lis)
                                 (mapcar (lambda (el)
                                           (if (stringp el)
                                               el
                                             (format "%S" el))) lis)
                               lis)) table)
                   (list :lend " \\\\" :sep " & " :hline hline)))))
(org-fill-template
 "
\\begin{longtable}%width%align
%firsthead
%head
%foot
%lastfoot

%table
\\end{longtable}\n"
 (list
  (cons "width"     (if width (format "{%s}" width) ""))
  (cons "align"     (if align (format "{%s}" align) ""))
  (cons "firsthead" (if firsthead (concat firsthead "\n\\endfirsthead\n") ""))
  (cons "head"      (if head (concat head "\n\\endhead\n") ""))
  (cons "foot"      (if foot (concat foot "\n\\endfoot\n") ""))
  (cons "lastfoot"  (if lastfoot (concat lastfoot "\n\\endlastfoot\n") ""))
  (cons "table" (orgtbl-to-generic
                 (mapcar (lambda (lis)
                           (if (listp lis)
                               (mapcar (lambda (el)
                                         (if (stringp el)
                                             el
                                           (format "%S" el))) lis)
                             lis)) table)
                 (list :lend " \\\\" :sep " & " :hline hline)))))
#+end_src

*** booktabs-notes


@@ 311,7 314,7 @@ are optional.
This source block builds on [[booktabs]].  It accepts two additional
arguments, both of which are optional.

#+tblname: arguments
#+name: arguments
| arg    | description                                          |
|--------+------------------------------------------------------|
| notes  | an org-mode table with footnotes                     |


@@ 320,91 323,91 @@ arguments, both of which are optional.
An example footnote to the =arguments= table specifies the column
span. Note the use of LaTeX, rather than Org-mode, markup.

#+tblname: arguments-notes
#+name: arguments-notes
| \multicolumn{2}{l}{This is a footnote to the \emph{arguments} table.} |

#+name: booktabs-notes
#+begin_src emacs-lisp :var table='((:head) hline (:body)) :var notes='() :var align='() :var env="tabular" :var width='() :var lspace='() :noweb yes :results latex
  (flet ((to-tab (tab)
                 (orgtbl-to-generic
                  (mapcar (lambda (lis)
                            (if (listp lis)
                                (mapcar (lambda (el)
                                          (if (stringp el)
                                              el
                                            (format "%S" el))) lis)
                              lis)) tab)
                  (list :lend " \\\\" :sep " & " :hline "\\hline"))))
    (org-fill-template
     "
    \\begin{%env}%width%align
    \\toprule
    %table
    \\bottomrule%spacer
    %notes
    \\end{%env}\n"
     (list
      (cons "env"       (or env "table"))
      (cons "width"     (if width (format "{%s}" width) ""))
      (cons "align"     (if align (format "{%s}" align) ""))
      (cons "spacer"    (if lspace "\\addlinespace" ""))
      (cons "table"
            ;; only use \midrule if it looks like there are column headers
            (if (equal 'hline (second table))
                (concat (to-tab (list (first table)))
                        "\n\\midrule\n"
                        (to-tab (cddr table)))
              (to-tab table)))
      (cons "notes" (if notes (to-tab notes) ""))
      )))
(flet ((to-tab (tab)
               (orgtbl-to-generic
                (mapcar (lambda (lis)
                          (if (listp lis)
                              (mapcar (lambda (el)
                                        (if (stringp el)
                                            el
                                          (format "%S" el))) lis)
                            lis)) tab)
                (list :lend " \\\\" :sep " & " :hline "\\hline"))))
  (org-fill-template
   "
  \\begin{%env}%width%align
  \\toprule
  %table
  \\bottomrule%spacer
  %notes
  \\end{%env}\n"
   (list
    (cons "env"       (or env "table"))
    (cons "width"     (if width (format "{%s}" width) ""))
    (cons "align"     (if align (format "{%s}" align) ""))
    (cons "spacer"    (if lspace "\\addlinespace" ""))
    (cons "table"
          ;; only use \midrule if it looks like there are column headers
          (if (equal 'hline (second table))
              (concat (to-tab (list (first table)))
                      "\n\\midrule\n"
                      (to-tab (cddr table)))
            (to-tab table)))
    (cons "notes" (if notes (to-tab notes) ""))
    )))
#+end_src

** Elegant lisp for transposing a matrix

#+tblname: transpose-example
#+name: transpose-example
| 1 | 2 | 3 |
| 4 | 5 | 6 |

#+name: transpose
#+begin_src emacs-lisp :var table=transpose-example
  (apply #'mapcar* #'list table)
(apply #'mapcar* #'list table)
#+end_src

#+resname:
#+name: transpose-output
| 1 | 4 |
| 2 | 5 |
| 3 | 6 |

** Convert every element of a table to a string

#+tblname: hetero-table
#+name: hetero-table
| 1 | 2 | 3 |
| a | b | c |

#+name: all-to-string
#+begin_src emacs-lisp :var tbl='()
  (defun all-to-string (tbl)
    (if (listp tbl)
        (mapcar #'all-to-string tbl)
      (if (stringp tbl)
          tbl
        (format "%s" tbl))))
  (all-to-string tbl)
(defun all-to-string (tbl)
  (if (listp tbl)
      (mapcar #'all-to-string tbl)
    (if (stringp tbl)
        tbl
      (format "%s" tbl))))
(all-to-string tbl)
#+end_src

#+begin_src emacs-lisp :var tbl=hetero-table
  (mapcar (lambda (row) (mapcar (lambda (cell) (stringp cell)) row)) tbl)
(mapcar (lambda (row) (mapcar (lambda (cell) (stringp cell)) row)) tbl)
#+end_src

#+name:
#+name: stringp-output1
| nil | nil | nil |
| t   | t   | t   |

#+begin_src emacs-lisp :var tbl=all-to-string(hetero-table)
  (mapcar (lambda (row) (mapcar (lambda (cell) (stringp cell)) row)) tbl)
(mapcar (lambda (row) (mapcar (lambda (cell) (stringp cell)) row)) tbl)
#+end_src

#+name:
#+name: stringp-output2
| t | t | t |
| t | t | t |



@@ 422,29 425,29 @@ local version control system, but has only been tested to work with
Git. 'limit' is currently unsupported.

#+name: vc-log
#+headers: :var limit=-1
#+headers: :var buf=(buffer-name (current-buffer))
#+header: :var limit=-1
#+header: :var buf=(buffer-name (current-buffer))
#+begin_src emacs-lisp
  ;; Most of this code is copied from vc.el vc-print-log
  (require 'vc)
  (when (vc-find-backend-function
         (vc-backend (buffer-file-name (get-buffer buf))) 'print-log)
    (let ((limit -1)
          (vc-fileset nil)
          (backend nil)
          (files nil))
      (with-current-buffer (get-buffer buf)
        (setq vc-fileset (vc-deduce-fileset t)) ; FIXME: Why t? --Stef
        (setq backend (car vc-fileset))
        (setq files (cadr vc-fileset)))
      (with-temp-buffer
        (let ((status (vc-call-backend
                       backend 'print-log files (current-buffer))))
          (when (and (processp status)   ; Make sure status is a process
                     (= 0 (process-exit-status status))) ; which has not terminated
            (while (not (eq 'exit (process-status status)))
              (sit-for 1 t)))
          (buffer-string)))))
;; Most of this code is copied from vc.el vc-print-log
(require 'vc)
(when (vc-find-backend-function
       (vc-backend (buffer-file-name (get-buffer buf))) 'print-log)
  (let ((limit -1)
        (vc-fileset nil)
        (backend nil)
        (files nil))
    (with-current-buffer (get-buffer buf)
      (setq vc-fileset (vc-deduce-fileset t)) ; FIXME: Why t? --Stef
      (setq backend (car vc-fileset))
      (setq files (cadr vc-fileset)))
    (with-temp-buffer
      (let ((status (vc-call-backend
                     backend 'print-log files (current-buffer))))
        (when (and (processp status)   ; Make sure status is a process
                   (= 0 (process-exit-status status))) ; which has not terminated
          (while (not (eq 'exit (process-status status)))
            (sit-for 1 t)))
        (buffer-string)))))
#+end_src

** Trivial python code blocks


@@ 463,22 466,22 @@ a + b

#+name: lob-add
#+begin_src emacs-lisp :var a=0 :var b=0
  (+ a b)
(+ a b)
#+end_src

#+name: lob-minus
#+begin_src emacs-lisp :var a=0 :var b=0
  (- a b)
(- a b)
#+end_src

#+name: lob-times
#+begin_src emacs-lisp :var a=0 :var b=0
  (* a b)
(* a b)
#+end_src

#+name: lob-div
#+begin_src emacs-lisp :var a=0 :var b=0
  (/ a b)
(/ a b)
#+end_src

* GANTT Charts


@@ 486,78 489,109 @@ a + b
The =elispgantt= source block was sent to the mailing list by Eric
Fraga.  It was modified slightly by Tom Dye.


** Example table of tasks and milestones for GANTT chart generation

The following table describes the tasks and other relevant information for a project.  Each line is an /entry/ and there are three types of entry allowed in this table:

- task :: an actual task that has a start time, a duration and an end time.
- milestone :: a specific milestone in the project that has a start time alone
- date :: a point in time that will be drawn as a vertical line in the GANTT chart (e.g. start of each year).

Each element of the chart will be annotated with the content of the /label/ column of each entry.  The first column of the table is ignored but I use it to number the entries.  The last column, titled /align/, is used to determine where to place the /activity/ text for tasks, whether to the left or right of the bar or, if nothing is specified, centred within the bar itself.

#+name: gantttesttable
|    | type      | label | activity      | depends | start | duration | end | align |
|----+-----------+-------+---------------+---------+-------+----------+-----+-------|
|  1 | date      | Start |               |         |     0 |          |   0 |       |
|  2 | task      | 1.1   | Lit survey    |         |     0 |        3 |   3 | right |
|  3 | task      | 1.2   | Develop model |       2 |     3 |        9 |  12 | right |
|  4 | milestone | M1    | model         |       3 |    12 |          |  12 |       |
|  5 | task      | 1.3   | Implement     |       3 |    12 |        6 |  18 | left  |
|  6 | date      | Y1    |               |         |    12 |          |  12 |       |
|  7 | milestone | M2    | software      |       5 |    18 |          |  18 |       |
|----+-----------+-------+---------------+---------+-------+----------+-----+-------|
|  8 | task      | 2.1   | Surrogate     |       3 |    15 |        6 |  21 | left  |
|  9 | task      | 2.2   | Implement     |       7 |    21 |        3 |  24 | left  |
| 10 | milestone | M3    | software      |       8 |    24 |          |  24 |       |
| 11 | date      | End   |               |         |    24 |          |  24 |       |
|----+-----------+-------+---------------+---------+-------+----------+-----+-------|
#+TBLFM: $1=1+@-1::$8=$6+$7::@5$6=@-1$+2::@6$6=@-1$+2::@8$6=@-2$+2::@9$6=3+@4$+2::@10$6=@-1$+2

** elispgantt

#+name: elispgantt
#+begin_src emacs-lisp :var table=gantttest
  (let ((dates "")
        (entries (nthcdr 2 table))
        (milestones "")
        (nmilestones 0)
        (ntasks 0)
        (projecttime 0)
        (tasks "")
        (xlength 1))
    (message "Initial: %s\n" table)
    (message "Entries: %s\n" entries)
    (while entries
      (let ((entry (first entries)))
        (if (listp entry)
            (let ((id (first entry))
                  (type (nth 1 entry))
                  (label (nth 2 entry))
                  (task (nth 3 entry))
                  (dependencies (nth 4 entry))
                  (start (nth 5 entry))
                  (duration (nth 6 entry))
                  (end (nth 7 entry))
                  (alignment (nth 8 entry)))
              (if (> start projecttime) (setq projecttime start))
              (if (string= type "task")
                  (let ((end (+ start duration))
                        (textposition (+ start (/ duration 2)))
                        (flush ""))
                    (if (string= alignment "left")
#+begin_src emacs-lisp :var table=gantttesttable
(let ((dates "")
      (entries (nthcdr 2 table))
      (milestones "")
      (nmilestones 0)
      (ntasks 0)
      (projecttime 0)
      (tasks "")
      (xlength 1))
  (message "Initial: %s\n" table)
  (message "Entries: %s\n" entries)
  (while entries
    (let ((entry (first entries)))
      (if (listp entry)
          (let ((id (first entry))
                (type (nth 1 entry))
                (label (nth 2 entry))
                (task (nth 3 entry))
                (dependencies (nth 4 entry))
                (start (nth 5 entry))
                (duration (nth 6 entry))
                (end (nth 7 entry))
                (alignment (nth 8 entry)))
            (if (> start projecttime) (setq projecttime start))
            (if (string= type "task")
                (let ((end (+ start duration))
                      (textposition (+ start (/ duration 2)))
                      (flush ""))
                  (if (string= alignment "left")
                      (progn
                        (setq textposition start)
                        (setq flush "[left]"))
                    (if (string= alignment "right")
                        (progn
                          (setq textposition start)
                          (setq flush "[left]"))
                      (if (string= alignment "right")
                          (progn
                            (setq textposition end)
                            (setq flush "[right]"))))
                    (setq tasks
                          (format "%s  \\gantttask{%s}{%s}{%d}{%d}{%d}{%s}\n"
                                  tasks label task start end textposition flush))
                    (setq ntasks (+ 1 ntasks))
                    (if (> end projecttime)
                        (setq projecttime end)))
                (if (string= type "milestone")
                    (progn
                      (setq milestones
                            (format
                             "%s  \\ganttmilestone{$\\begin{array}{c}\\mbox{%s}\\\\ \\mbox{%s}\\end{array}$}{%d}\n"
                             milestones label task start))
                      (setq nmilestones (+ 1 nmilestones)))
                  (if (string= type "date")
                      (setq dates (format "%s  \\ganttdateline{%s}{%d}\n"
                                          dates label start))
                    (message "Ignoring entry with type %s\n" type)))))
          (message "Ignoring non-list entry %s\n" entry)) ; end if list entry
        (setq entries (cdr entries))))  ; end while entries left
    (format "\\pgfdeclarelayer{background}
  \\pgfdeclarelayer{foreground}
  \\pgfsetlayers{background,foreground}
  \\renewcommand{\\ganttprojecttime}{%d}
  \\renewcommand{\\ganttntasks}{%d}
  \\noindent
  \\begin{tikzpicture}[y=-0.75cm,x=0.75\\textwidth]
    \\begin{pgfonlayer}{background}
      \\draw[very thin, red!10!white] (0,1+\\ganttntasks) grid [ystep=0.75cm,xstep=1/\\ganttprojecttime] (1,0);
      \\draw[\\ganttdatelinecolour] (0,0) -- (1,0);
      \\draw[\\ganttdatelinecolour] (0,1+\\ganttntasks) -- (1,1+\\ganttntasks);
    \\end{pgfonlayer}
  %s
  %s
  %s
  \\end{tikzpicture}" projecttime ntasks tasks milestones dates))
                          (setq textposition end)
                          (setq flush "[right]"))))
                  (setq tasks
                        (format "%s  \\gantttask{%s}{%s}{%d}{%d}{%d}{%s}\n"
                                tasks label task start end textposition flush))
                  (setq ntasks (+ 1 ntasks))
                  (if (> end projecttime)
                      (setq projecttime end)))
              (if (string= type "milestone")
                  (progn
                    (setq milestones
                          (format
                           "%s  \\ganttmilestone{$\\begin{array}{c}\\mbox{%s}\\\\ \\mbox{%s}\\end{array}$}{%d}\n"
                           milestones label task start))
                    (setq nmilestones (+ 1 nmilestones)))
                (if (string= type "date")
                    (setq dates (format "%s  \\ganttdateline{%s}{%d}\n"
                                        dates label start))
                  (message "Ignoring entry with type %s\n" type)))))
        (message "Ignoring non-list entry %s\n" entry)) ; end if list entry
      (setq entries (cdr entries))))  ; end while entries left
  (format "\\pgfdeclarelayer{background}
\\pgfdeclarelayer{foreground}
\\pgfsetlayers{background,foreground}
\\renewcommand{\\ganttprojecttime}{%d}
\\renewcommand{\\ganttntasks}{%d}
\\noindent
\\begin{tikzpicture}[y=-0.75cm,x=0.75\\textwidth]
  \\begin{pgfonlayer}{background}
    \\draw[very thin, red!10!white] (0,1+\\ganttntasks) grid [ystep=0.75cm,xstep=1/\\ganttprojecttime] (1,0);
    \\draw[\\ganttdatelinecolour] (0,0) -- (1,0);
    \\draw[\\ganttdatelinecolour] (0,1+\\ganttntasks) -- (1,1+\\ganttntasks);
  \\end{pgfonlayer}
%s
%s
%s
\\end{tikzpicture}" projecttime ntasks tasks milestones dates))
#+end_src

* Available languages