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Full Discussion: Search a multi-line shell command output and execute logic based on result
Top Forums UNIX for Beginners Questions & Answers Search a multi-line shell command output and execute logic based on result Post 303042192 by yogi on Wednesday 18th of December 2019 02:20:07 PM
Old 12-18-2019
Search a multi-line shell command output and execute logic based on result
The following is a multi-line shell command example:


Code:
$cargo build
   Compiling prawn v0.1.0 (/Users/ag/rust/prawn)
error[E0433]: failed to resolve: could not find `setup_panix` in `human_panic`
  --> src/main.rs:14:22
   |
14 |         human_panic::setup_panix!();
   |                      ^^^^^^^^^^^ could not find `setup_panix` in `human_panic`

error[E0412]: cannot find type `DGConfig` in crate `prawn`
  --> src/main.rs:25:27
   |
25 |     let db_config: prawn::DGConfig = envy::from_env().unwrap_or_else(|err| {
   |                           ^^^^^^^^ help: a struct with a similar name exists: `DBConfig`

error: aborting due to 2 previous errors

What I would like to accomplish here is to use the above multi-lines returned by cargo build command. Search all multi-lines for error[] substrings and store the count in a variable so the result can be used to handle another case logic.


Ideally, I want to accomplish something along the following code block:


Code:
function cargo_watch_notify() {
  echo "Watching for .rs file changes..."

  count=0
  "$(echo cargo build | egrep -w 'error' | ls -c >>>$count)"
  if [ $count -ge 1 ]; then
    growlnotify --title "Error" --message "Compiler found $count errors!"
  else
    growlnotify --title "Success" --message "Cargo build compiled successfully!"
  fi
  exit 1;
}

I realize the above block is broken. This is just what I have to work with for the moment. The only difference in my example is that I need to search for error and brackets strings and not the error string by itself. i.e. error[E0412] the top cargo build command should return a count of 2
 

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LEARN ABOUT DEBIAN

scan-build

SCAN-BUILD(1)															     SCAN-BUILD(1)

NAME

       scan-build

       scan-build(1) -- An utility for running the clang(1) analyzer from the command line

SYNOPSIS

       scan-build options build command [build options]

DESCRIPTION

       scan-build is a command line utility that enables a user to run the clang static analyzer over their codebase as part of performing a regu-
       lar build (from the command line).

OPTIONS

       -analyze-headers
	      Also analyze functions in #included files.

       -o     Target directory for HTML report files. Subdirectories will be created as needed to represent separate "runs" of	the  analyzer.	If
	      this option is not specified, a directory is created in /tmp (TMPDIR on Mac OS X) to store the reports.

       -h, --help
	      Display the help message.

       -k     Add a "keep on going" option to the specified build command.

       --keep-going
	      This option currently supports make and xcodebuild. This is a convenience option; one can specify this behavior directly using build
	      options.

       --html-title [title]
	      Specify the title used on generated HTML pages.

       --html-title=[title]
	      If not specified, a default title will be used.

       -plist By default the output of scan-build is a set of HTML files. This option outputs the results as a set of .plist files.

       --status-bugs
	      By default, the exit status of scan-build is the same as the executed build command. Specifying this option causes the  exit  status
	      of scan-build to be 1 if it found potential bugs and 0 otherwise.

       --use-cc [compiler path]
	      By default, scan-build uses 'gcc' to compile and link

       --use-cc=[compiler path]
	      your C and Objective-C code. Use this option to specify an alternate compiler.

       --use-c++ [compiler path]
	      By default, scan-build uses 'g++' to compile and link

       --use-c++=[compiler path]
	      your C++ and Objective-C++ code. Use this option to specify an alternate compiler.

       -v     Verbose output from scan-build and the analyzer. A second and third '-v' increases verbosity.

       -V     View analysis results in a web browser when the build

       --view completes.

ADVANCED OPTIONS
:
       -constraints [model]
	      Specify  the  contraint  engine  used by the analyzer. By default the 'range' model is used. Specifying 'basic' uses a simpler, less
	      powerful constraint model used by checker-0.160 and earlier.

       -store [model]
	      Specify the store model used by the analyzer. By default, the 'region' store model is used. 'region'  specifies  a  field  sensitive
	      store  model.  Users  can also specify 'basic', which is far less precise but can more quickly analyze code. 'basic' was the default
	      store model for checker-0.221 and earlier.

       -no-failure-reports
	      Do not create a 'failures' subdirectory that includes analyzer crash reports and preprocessed source files.

EXAMPLES

       Basic usage of scan-build is designed to be simple: just place the word "scan-build" in front of your build command:

       $ scan-build make

       $ scan-build xcodebuild

       In the first case scan-build analyzes the code of a project built with make and in the second case  scan-build  analyzes  a  project  built
       using xcodebuild.

       It is also possible to use scan-build to analyze specific files:

       $ scan-build gcc -c t1.c t2.c

       This example causes the files t1.c and t2.c to be analyzed.

AUTHORS

       Maintained by the Clang / LLVM Team http://clang.llvm.org.

       This manual page was written by Ermenegildo Fiorito fiorito.g@gmail.com for the Debian Project.

SEE ALSO

       clang(1) scan-view(1) http://clang-analyzer.llvm.org

								   December 2010						     SCAN-BUILD(1)
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