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Femto is an extended version of Atto Emacs with a Tiny Lisp extension
languauge
# Goals of Femto Emacs
* To be an extendable version of the Atto Emacs editor using a Tiny Lisp
extension language
* Provide a number of useful extension packages written in Tiny Lisp (these
include an interface to **git** (similar to GNU Emacs Magit), a small
version of **dired**, a buffer management menu (**buffer menu**),
**defmacro** allows for a macro to be recorded and invoked using c-x e, and
an interface to **grep**.
* Be easy to understand without extensive study (to encourage further
experimentation).
# What does Femto bring to the party of Text Editors
As far as I know Femto is the only Emacs style editor to provide a macro
recorder that generates usable Lisp code that can then be used to build a
larger, more complex utility. Whilst GNU Emacs has a macro recorder facility
it only allows you to dump out the keystrokes used during macro recording.
Femto does this by writing the lisp code to a text buffer called **macro**.
Though I have tried dozens of text editors over the years (mostly on PCs, but
a few on mini and mainframe computers) I am not aware of any other editor that
works this way. This feature was born out of the principle of keeping a small
editor code written in C and where possible using Lisp to implement new
features. The standard Emacs macro keystrokes [C-x (, C-c ), C-x e] are all
written in Lisp in the file examples/defmacro.lsp. This meant that no special
C code was needed in Femto to know when it was in macro mode or not.
Comparisons with Other Emacs Implementations
Femto has almost the same level of functionality as MicroEmacs 3.10 for a
codebase 1/10 of the size.
Editor Binary BinSize KLOC Files
atto atto 33002 1.9k 10
pEmacs pe 59465 5.7K 16
Esatz-Emacs ee 59050 5.7K 14
femto femto 356399 6.3k 18 **
GNOME GNOME 55922 9.8k 13
Zile zile 257360 11.7k 48
Mg mg 585313 16.5K 50
uEmacs/Pk em 147546 17.5K 34
Pico pico 438534 24.0k 29
Nano nano 192008 24.8K 17
jove jove 248824 34.7k 94
Qemacs qe 379968 36.9k 59
ue3.10 uemacs 171664 52.4K 16 ++
GNUEmacs emacs 14632920 358.0k 186
# Femto Key Bindings
C-A begining-of-line
C-B backward-character
C-D delete-char
C-E end-of-line
C-F forward Character
C-G Abort (at prompts)
C-H backspace
C-I handle-tab
C-J newline
C-K kill-to-eol
C-L refresh display
C-M Carrage Return
C-N next line
C-P previous line
C-R search-backwards
C-S search-forwards
C-U Undo
C-V Page Down
C-W Kill Region (Cut)
C-X CTRL-X command prefix
C-Y Yank (Paste)
M-< Start of file
M-> End of file
M-v Page Up
M-f Forward Word
M-b Backwards Word
M-g goto-line
M-r Search and Replace
M-w copy-region
C-<spacebar> Set mark at current position.
^X^B List Buffers
^X^C Exit. Any unsaved files will require confirmation.
^X^F Find file; read into a new buffer created from filename.
^X^S Save current buffer to disk, using the filename associated with the
buffer
^X^W Write current buffer to disk. Type in a new filename at the prompt
^X shell-command (prompted for a command which is sent to the shell
^Xi Insert file at point
^X= Show Character at position
^X^N next-buffer
^Xn next-buffer
^Xk kill-buffer
^X1 delete-other-windows
^X2 split-window
^Xo other-window
Home Beginning-of-line
End End-of-line
Del Delete character under cursor
Ins Toggle Overwrite Mode
Left Move left
Right Move point right
Up Move to the previous line
Down Move to the next line
Backspace delete caharacter on the left
Ctrl+Up beginning of file
Ctrl+Down end of file
Ctrk+Left Page Down
Ctrl+Right Page Up
## Copying and moving
C-<spacebar> Set mark at current position
^W Delete region
^Y Yank back kill buffer at cursor
M-w Copy Region
A region is defined as the area between this mark and the current cursor
position. The kill buffer is the text which has been most recently deleted or
copied.
Generally, the procedure for copying or moving text is:
1. Mark out region using M-<spacebar> at the beginning and move the cursor to
the end.
2. Delete it (with ^W) or copy it (with M-W) into the kill buffer.
3. Move the cursor to the desired location and yank it back (with ^Y).
## Searching
C-S or C-R enters the search prompt, where you type the search string
BACKSPACE - will reduce the search string, any other character will extend
it
C-S at the search prompt will search forward, will wrap at end of the
buffer
C-R at the search prompt will search backwards, will wrap at start of the
buffer
ESC will escape from the search prompt and return to the point of the
match
C-G abort the search and return to point before the search started
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Contents of dev/gg/femto.lhaPERMISSION UID GID PACKED SIZE RATIO METHOD CRC STAMP NAME
---------- ----------- ------- ------- ------ ---------- ------------ ----------
[generic] 2120 6415 33.0% -lh5- 2130 Apr 23 13:54 femto/buffer.c
[generic] 1605 3606 44.5% -lh5- e2ca Apr 23 13:54 femto/CHANGE.LOG.md
[generic] 5581 18898 29.5% -lh5- c621 Apr 23 13:54 femto/command.c
[generic] 917 1995 46.0% -lh5- d90a Apr 23 13:54 femto/complete.c
[generic] 1134 2764 41.0% -lh5- db15 Apr 23 13:54 femto/data.c
[generic] 2910 8052 36.1% -lh5- 54ad Apr 23 13:54 femto/display.c
[generic] 32 32 100.0% -lh0- 6492 Apr 23 13:54 femto/docs/4utf8.txt
[generic] 456 1010 45.1% -lh5- 34b9 Apr 23 13:54 femto/docs/commands.txt
[generic] 230 406 56.7% -lh5- fa90 Apr 23 13:54 femto/docs/git.txt
[generic] 606 1539 39.4% -lh5- 2a91 Apr 23 13:54 femto/docs/hltest.c
[generic] 506 714 70.9% -lh5- 22ca Apr 23 13:54 femto/docs/simplified_chinese.txt
[generic] 656 1196 54.8% -lh5- 27c8 Apr 23 13:54 femto/docs/TODO.txt
[generic] 6041 14052 43.0% -lh5- 91e6 Apr 23 13:54 femto/docs/UTF8.txt
[generic] 1765 6135 28.8% -lh5- 29e0 Apr 23 13:54 femto/examples/bufmenu.lsp
[generic] 702 2456 28.6% -lh5- db48 Apr 23 13:54 femto/examples/defmacro.lsp
[generic] 3623 14783 24.5% -lh5- 5e82 Apr 23 13:54 femto/examples/dired.cmd
[generic] 1246 3970 31.4% -lh5- dc7d Apr 23 13:54 femto/examples/dired.lsp
[generic] 1965 5632 34.9% -lh5- 4a1f Apr 23 13:54 femto/examples/femto.rc
[generic] 90 168 53.6% -lh5- 10b9 Apr 23 13:54 femto/examples/fib.lsp
[generic] 1989 6957 28.6% -lh5- ce7d Apr 23 13:54 femto/examples/git.lsp
[generic] 394 1101 35.8% -lh5- 998b Apr 23 13:54 femto/examples/grep.lsp
[generic] 240 388 61.9% -lh5- 8e60 Apr 23 13:54 femto/examples/hex.lsp
[generic] 166 395 42.0% -lh5- 365c Apr 23 13:54 femto/examples/lists.lsp
[generic] 1539 4793 32.1% -lh5- 159d Apr 23 13:54 femto/examples/oxo.lsp
[generic] 533 1215 43.9% -lh5- 48a9 Apr 23 13:54 femto/examples/prompt.lsp
[generic] 196 450 43.6% -lh5- 97f0 Apr 23 13:54 femto/examples/startup.lsp
[generic] 707 1849 38.2% -lh5- f639 Apr 23 13:54 femto/examples/testfunc.lsp
[generic] 2660 8205 32.4% -lh5- 07f3 Apr 23 13:54 femto/funcmap.c
[generic] 1690 4976 34.0% -lh5- 8bba Apr 23 13:54 femto/gap.c
[generic] 4381 15404 28.4% -lh5- 3b46 Apr 23 13:54 femto/header.h
[generic] 656 2248 29.2% -lh5- c9b6 Apr 23 13:54 femto/hilite.c
[generic] 3385 12233 27.7% -lh5- 1b0a Apr 23 13:54 femto/key.c
[generic] 14026 58479 24.0% -lh5- 5265 Apr 23 13:54 femto/lisp.c
[generic] 1616 3548 45.5% -lh5- 34d5 Apr 23 13:54 femto/main.c
[generic] 488 1562 31.2% -lh5- b879 Apr 23 13:54 femto/makefile
[generic] 7367 20383 36.1% -lh5- 7f1e Apr 23 13:54 femto/README.md
[generic] 1274 3027 42.1% -lh5- b20b Apr 23 13:54 femto/replace.c
[generic] 198901 198901 100.0% -lh0- 0826 Apr 23 13:54 femto/screenshots/femto-femtorc.jpg
[generic] 142759 142759 100.0% -lh0- c77c Apr 23 13:54 femto/screenshots/femto-hilite.png
[generic] 90113 90113 100.0% -lh0- 034c Apr 23 13:54 femto/screenshots/femto-lisp.jpg
[generic] 36963 36963 100.0% -lh0- 18fd Apr 23 13:54 femto/screenshots/femto-oxo.jpg
[generic] 98108 98108 100.0% -lh0- cf49 Apr 23 13:54 femto/screenshots/femto-startup.jpg
[generic] 913 2517 36.3% -lh5- 20d5 Apr 23 13:54 femto/search.c
[generic] 3885 13327 29.2% -lh5- 9d5e Apr 23 13:54 femto/undo.c
[generic] 655 1289 50.8% -lh5- 8533 Apr 23 13:54 femto/utils.c
[generic] 1434 4250 33.7% -lh5- 339d Apr 23 13:54 femto/window.c
[generic] 135423 409048 33.1% -lh5- 6b37 Apr 23 14:39 femto/femto
---------- ----------- ------- ------- ------ ---------- ------------ ----------
Total 47 files 784646 1238311 63.4% Apr 24 01:38
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