Posts

Plan 9: Code Assist

Image
Jump to definition with ctags    Use ctags for jump-to-defintion. Also, you can use Button3 in acme to jump to include files - both system and local headers.  Note: Use  sig  command for signature lookup.  Use  src  command for jumping to Plan 9 command sources.  If you have mounted contrib sources, use this . Alternatively, download tar from https://ctags.sourceforge.net/  . Make following changes: in Makefile, add '-DHAVE_REMOVE' (remove() instead of unlink()) and '-DHAVE_OPENDIR' (for directory recursion option) to DEFS in config.h, remove or comment out the definition of INT_MAX  # Use one below to enable APE bind -b /$objtype/bin/ape /bin ape/psh    ./configure  # ctags make # readtags need explicit build  make readtags  cp ctags readtags /$objtype/bin   # Generate tags file for a single file ctags main.c # Generate tags file for all files recursively ctags -R .   # Write output to s...
Post a Comment
Read more

Plan 9: Devanagari Input with kbmap

Image
  Note : The demo uses layer 3 for better key visualization while using Devanagari.                The PS/2 interface presents two physical layers, switched on if the input scancode is one or two bytes. This second "escaped" layer is typically generated for keys like `Home' and `Ins'. Kbdfs additionally maintains eight more virtual layers that are switched on `Shift', `Ctl', `AltGr', and `Mod4' modifier key state. Not all permutations of these modifiers are represented as layers, the exhaustive list is as follows: none Key shift Shift + Key esc Escaped Key altgr AltGr + Key ctl Ctl + Key ctlesc Ctl + Escaped Key shiftesc Shift + Escaped Key shiftaltgr Shift + AltGr + Key mod4 Mod4 + Key altgr...
Post a Comment
Read more

Plan 9: Key Visualizer

Image
Simple key visualizer for capturing keystrokes during a screencast using kbdfs, awk and statusmsg. Note : You need a Truetype font for arbitrary large display ( /n/ttf/mine/32/font  in the example).  Also, ensure truetypefs is running if you do use Truetype font.   #!/bin/rc fn notify {     scr=`{awk '{print $4, $5}' /dev/screen}     w=200     h=60     ws=$scr(1)     hs=$scr(2)     minx=`{echo $ws - $w | bc}     warg=`{echo -w  $minx,0,$ws,$h}     font=/n/ttf/mine/32/font aux/statusmsg $warg $1 } {     tee /dev/kbdtap |     tr '\000' '\034' |     awk -v 'RS=\034' '     BEGIN {         esc   = sprintf("%c", 033)         tab   = sprintf("%c", 011)         bksp  = sprintf("%c", 010)         del   = sprintf("%c", 0177)      ...
Post a Comment
Read more

Plan 9: Emoji

Image
  Noto Emoji Font Note:  Noto Color emoji needs Color Bitmap Data (CBDT) or COLR/CPAL support.   Four independent bugs, spanning truetypefs.c , hint.c , and head.c : 1. assert(gs[i] != nil) crash in compilesub ( truetypefs.c ) ttffindchar returning glyph 0 for a rune inside a declared cmap segment (a genuine gap, not just the NUL special-case) skipped the retry-via-notdef path entirely. If the font's own .notdef then also failed to rasterize, the assert took the whole fileserver down. Fixed by replacing the assert with a synthesized blank placeholder as the last resort in the fallback chain. 2. No bounds checking on glyph geometry before blit() ( truetypefs.c ) blit() has zero validation of its own; compilesub sized the destination strip from the font's declared ascentpx + descentpx but never checked that an individual glyph's actual rendered width/height/vertical position fit inside that buffer. A decorative font ( architectsdaughter ) reporting ink extents...
Post a Comment
Read more

Plan 9: Dynamic HTML

Image
  Render Dynamic HTML using plot and qjs. Render a simple website   Font zoom   E-Book Reader eBook is a collection of HTML files in a ZIP archive. Follow same steps for Comic Book reader which are collection of JPG/PNG images in a ZIP/RAR archive. For columns, pure HTML solution involves column-count CSS property. However, this works only for designed screen sizes. For non-standard sizes, the first column might span multiple pages before continuing in the second column. Hence, the page mode manages the split without relying on the column-count.   Keymap t                          Table of Content -/=                     Font zoom 1,2,3                  Column s                         Toggle scroll/page mode  ...
Post a Comment
Read more

Plan 9 Plumber

Image
Plumb Zip file   View files inside a zip compressed file via Plumber without extraction. Zip file contents are accessible at /n/tapefs. (Note: sam displays the UTF Byte-Order-Mark (BOM) as is - the garbage in the beginning of the first line). #zip file content in a new window type    is    text data    matches    '([a-zA-Z¡-ï¿¿0-9_\-.,/]+)\.zip' arg    isfile    $0 plumb    start    window fs/zipfs $file; cd /n/tapefs; ls; rc   Plumber process, usually running in the parent process, does not have visibility into the folders mounted by the child process because of namespace isolation. Hence, you need the following changes: zipfs (or 32vfs, cpiofs, tapfs, tarfs, tpfs, v6fs, v10fs etc.) must expose a service in the /srv directory. ( fs.c ) plumber must mount the zipfs for paths starting with /n/tapefs before checking for file existence. ( match.c )   
Post a Comment
Read more

Plan 9: Tiled Map

Image
  Use plot(1) to display tiled maps. The zoom factor decides the grid dimension. osm.js: Download tile images from OpenStreetMaps using hget. Cache the images. Convert the PNG image into Plan 9 format using png. Display the images using plot. Plot script   ra 0 0 200 200 m 0 100 im /file :Note - must end the script with a newline     Plot tries to center the drawing. Hence the origin is at the bottom with a slight offset from the left. However, image uses origin at the top left.     Interactive Plotting and Maps Use plot command in server mode (-s option). plot -s a.plt  mount /srv/plot /mnt/plot echo li 0 0 100 100 > /mnt/plot/ctl echo erase > /mnt/plot/ctl Usage as an interactive map.   OSM API Tiles https://tile.openstreetmap.org/zoom/x/y.png   The World map at zoom 0 https://tile.openstreetmap.org/0/0/0.png     Geocoding (Name to geographical co-ordinates) https://nominatim.openstreetmap.org/search?q=hebba...
Post a Comment
Read more