allow models to also be executables

This commit is contained in:
NunoSempere 2024-07-12 18:29:55 -04:00
parent ade8947734
commit 07f0fd1d3f
3 changed files with 53 additions and 7 deletions

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@ -1,6 +1,6 @@
# A minimalist calculator for fermi estimation # A calculator for distributions, for Fermi estimation
This project is a minimalist, calculator-style DSL for fermi estimation. It can multiply, divide, add and substract scalars, lognormals and beta distributions. This project is a minimalist, calculator-style DSL for fermi estimation. It can multiply, divide, add and substract scalars, lognormals and beta distributions, and supports variables.
## Motivation ## Motivation
@ -101,8 +101,31 @@ $ fermi -n 1_000_000
- It's conceptually clearer to have all the multiplications first and then all the divisions - It's conceptually clearer to have all the multiplications first and then all the divisions
- For things between 0 and 1, consider using a beta distribution - For things between 0 and 1, consider using a beta distribution
- Because the model reads from standard input, you can pipe a model to it. For instance, try cat more/piano-tuners.f | fermi
- You can also save a session to a logfile with tee. Try fermi | tee -a fermi.log
### Integrations with linux utilities
Because the model reads from standard input, you can pipe a model to it:
```
$ cat more/piano-tuners.f | fermi
```
You can also
...which means a model an executable file by adding the following at the top!
```
#!/bin/usr/fermi -f
```
You can save a session to a logfile with tee:
```
fermi | tee -a fermi.log
```
## Different levels of complexity ## Different levels of complexity
@ -143,10 +166,10 @@ Done:
- [x] Allow input with K/M/T - [x] Allow input with K/M/T
- [x] Document parenthesis syntax - [x] Document parenthesis syntax
- [x] Specify number of samples as a command line option - [x] Specify number of samples as a command line option
- [x] Figure out how to make models executable, by adding a #!/bin/bash-style command at the top?
To (possibly) do: To (possibly) do:
- [ ] Figure out how to make models executable, by adding a #!/bin/bash-style command at the top?
- [ ] Add functions. Now easier to do with an explicit representation of the stakc - [ ] Add functions. Now easier to do with an explicit representation of the stakc
- [ ] Think about how to draw a histogram from samples - [ ] Think about how to draw a histogram from samples
- [ ] Dump samples to file - [ ] Dump samples to file

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@ -411,10 +411,23 @@ replForLoop:
func main() { func main() {
num_samples_flag := flag.Int("n", N_SAMPLES, "Specifies the number of samples to draw when using samples") num_samples_flag := flag.Int("n", N_SAMPLES, "Specifies the number of samples to draw when using samples")
flag.Parse()
N_SAMPLES = *num_samples_flag N_SAMPLES = *num_samples_flag
filename := flag.String("f", "", "Specifies a file with a model to run")
flag.Parse()
reader := bufio.NewReader(os.Stdin) var reader *bufio.Reader = nil
if *filename != "" {
file, err := os.Open(*filename)
if err == nil {
reader = bufio.NewReader(file)
} else {
fmt.Printf("Error opening filename; reading from stdin instead\n")
}
}
if reader == nil {
reader = bufio.NewReader(os.Stdin)
}
stack := Stack{old_dist: INIT_DIST, vars: make(map[string]Dist)} stack := Stack{old_dist: INIT_DIST, vars: make(map[string]Dist)}
runRepl(stack, reader) runRepl(stack, reader)
} }

10
more/executable-model.fermi Executable file
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@ -0,0 +1,10 @@
#!/bin/fermi -f
5M 12M # number of people living in Chicago
beta 1 200 # fraction of people that have a piano
30 180 # minutes it takes to tune a piano, including travel time
/ 48 52 # weeks a year that piano tuners work for
/ 5 6 # days a week in which piano tuners work
/ 6 8 # hours a day in which piano tuners work
/ 60 # minutes to an hour
=: piano_tuners
exit