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vim, Ale, Syntastic and Perl::Critic | i hack on things
Setting up Ale syntax and linter on Vim with specific Perl bindings.
Perl  PerlCritic  Lint  Vi  vim  Ale  Syntax 
2 days ago by lost_in_space
stl - Iterate keys in a C++ map - Stack Overflow
What's difficult to discern from the STL documentation at, say, cppreference.com, is that the allocator is a std::pair. That gives you the clue that instead of "key" and "value" you need to be saying "it->first" and "it->second" when looping over the elements with a std::iterator.
cplusplus  stl  iterator  map  syntax  solution 
2 days ago by kme
The Unix Shell's Humble If | https://robots.thoughtbot.com/
This is a really good article, and it mentions things like not quoting regexes in double-square-brace tests.
unix  linux  bash  shellscripting  test  conditionals  newbie  quoting  syntax  tutorial 
4 days ago by kme
Basic AST Manipulation in Go - zupzup
Traversing an AST (Abstract Syntax Tree) is useful for analysing and understanding a code-base, but the real power comes when we are able to manipulate it, which allows us to build tools. This post shows a simple example of how to manipulate the AST in Go.
golang  ast  syntax  tree 
5 days ago by geetarista
How can I replace a newline (n) using sed? - Stack Overflow | https://stackoverflow.com/
Note that you have to give each command as a separate `-e` in OS X and BSD. I thought that the `$!ba` was the problem (history expansion), and wasted a bunch of time trying to figure out why it wouldn't work on OS X. It was the semicolons!
Fast answer:

<code class="language-bash">sed ':a;N;$!ba;s/\n/ /g' file</code>

- :a create a label 'a'
- N append the next line to the pattern space
- $! if not the last line, ba branch (go to) label 'a'
- s substitute, /\n/ regex for new line, / / by a space, /g global match (as many times as it can)

sed will loop through step 1 to 3 until it reach the last line, getting all lines fit in the pattern space where sed will substitute all \n characters

All alternatives, unlike sed will not need to reach the last line to begin the process

with bash, slow

<code class="language-"bash>while read line; do printf "%s" "$line "; done < file</code>

with perl, sed-like speed

<code class="language-bash">perl -p -e 's/\n/ /' file</code>

with tr, faster than sed, can replace by one character only

<code class="language-bash">tr '\n' ' ' < file</code>

with paste, tr-like speed, can replace by one character only

<code class="language-bash">paste -s -d ' ' file</code>

with awk, tr-like speed

<code class="language-bash">awk 1 ORS=' ' file</code>
bash  shellscript  sed  syntax  newbie  textprocessing  fuckina  solution 
8 days ago by kme

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