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new cmd: nim r main [args...] to compile & run, saving binary under $nimcache/main (#13382)

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* implement `nim r main` to compile and run, saving binary to $nimcache
* remove outFileAbs for now
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Timothee Cour 2020-04-23 01:02:18 -07:00 • committed by GitHub
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changelog.md
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@ -75,6 +75,17 @@
- Specific warnings can now be turned into errors via `--warningAsError[X]:on|off`.
- The `define` and `undef` pragmas have been de-deprecated.
- New command: `nim r main.nim [args...]` which compiles and runs main.nim, saving
the binary to $nimcache/main$exeExt, using the same logic as `nim c -r` to
avoid recompiling when sources don't change. This is now the preferred way to
run tests, avoiding the usual pain of clobbering your repo with binaries or
using tricky gitignore rules on posix. Example:
```nim
nim r compiler/nim.nim --help # only compiled the first time
echo 'import os; echo getCurrentCompilerExe()' | nim r - # this works too
nim r compiler/nim.nim --fullhelp # no recompilation
nim r --nimcache:/tmp main # binary saved to /tmp/main
```
## Tool changes