-
Notifications
You must be signed in to change notification settings - Fork 0
/
2020-08-11-nix-expression-lang-repl.txt
408 lines (307 loc) · 12.2 KB
/
2020-08-11-nix-expression-lang-repl.txt
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
# Playing with the Nix expression language on the `nix repl`
```text
$ nix repl
Welcome to Nix version 2.3.6. Type :? for help.
```
These errored out as these are not functions:
```text
nix-repl> b = { s ? { a = 27;}, p ? s.a }
error: syntax error, unexpected ';', expecting ':' or '@', at (string):2:1
nix-repl> b = { s ? { a = 27;}, p ? s.a }; b.p
error: syntax error, unexpected ';', expecting ':' or '@', at (string):1:29
nix-repl> let b = { s ? { a = 27;}, p ? s.a } in b.p
error: syntax error, unexpected IN, expecting ':' or '@', at (string):1:37
nix-repl> let b = { s ? { a = 27;}, p ? s.a }; in b.p
error: syntax error, unexpected ';', expecting ':' or '@', at (string):1:36
nix-repl> let b = { s ? { a = 27;}, p ? s.a }: in b.p
error: syntax error, unexpected IN, at (string):1:39
```
Once I realized, they worked, and calling them as
anonymous functions is similar to other langs:
```
nix-repl> { s ? { a = 27;}, p ? s.a }: p
«lambda @ (string):1:1»
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p)
«lambda @ (string):1:2»
```
These are all equivalent, and currying works:
```
nix-repl> (square: (x: y: square y + square x) 2 7) (x: x*x)
53
nix-repl> (square: (x: y: square y + square x)) (x: x*x)
«lambda @ (string):1:11»
nix-repl> (square: (x: y: square y + square x)) (x: x*x) 2
«lambda @ (string):1:14»
nix-repl> (square: (x: y: square y + square x)) (x: x*x) 2 7
53
nix-repl> (square: x: y: square y + square x) (x: x*x) 2 7
53
```
Another round with default values:
```text
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ()
error: syntax error, unexpected ')', at (string):1:35
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p)
«lambda @ (string):1:2»
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({})
27
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({2})
error: syntax error, unexpected INT, at (string):1:36
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({{c = 7}})
error: syntax error, unexpected '{', at (string):1:36
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({{c = 7;}})
error: syntax error, unexpected '{', at (string):1:36
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({a = 7;})
error: anonymous function at (string):1:2 called with unexpected argument 'a', at (string)
:1:1
nix-repl>
nix-repl>
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({2})
error: syntax error, unexpected INT, at (string):1:36
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) (2)
error: value is an integer while a set was expected, at (string):1:1
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({a = 7;})
error: anonymous function at (string):1:2 called with unexpected argument 'a', at (string)
:1:1
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({a = 7; b = 2})
error: syntax error, unexpected '}', expecting ';', at (string):1:48
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({a = 7; b = 2;})
error: anonymous function at (string):1:2 called with unexpected argument 'a', at (string)
:1:1
nix-repl> {a = 7;}
{ a = 7; }
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({{a = 7};})
error: syntax error, unexpected '{', at (string):1:36
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({{a = 7;}})
error: syntax error, unexpected '{', at (string):1:36
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({{a = 7;};})
error: syntax error, unexpected '{', at (string):1:36
nix-repl> {{a = 7;};}
error: syntax error, unexpected '{', at (string):1:2
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({b = {a = 7;};})
error: anonymous function at (string):1:2 called with unexpected argument 'b', at (string)
:1:1
nix-repl> { b = {a = 7;};}
{ b = { ... }; }
nix-repl> import <nixpkgs>
«lambda @ /nix/var/nix/profiles/per-user/root/channels/nixos/pkgs/top-level/impure.nix:15:
1»
nix-repl> { import <nixpkgs> }
error: syntax error, unexpected SPATH, expecting '.' or '=', at (string):1:10
nix-repl> { a = import <nixpkgs> }
error: syntax error, unexpected '}', expecting ';', at (string):1:24
nix-repl> { a = import <nixpkgs>; }
{ a = «lambda @ /nix/var/nix/profiles/per-user/root/channels/nixos/pkgs/top-level/impure.n
ix:15:1»; }
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({{a = 7;};})
error: syntax error, unexpected '{', at (string):1:36
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) ({})
27
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) {}
27
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) { a = 7;}
error: anonymous function at (string):1:2 called with unexpected argument 'a', at (string)
:1:1
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) { s = 7;}
error: value is an integer while a set was expected, at (string):1:24
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) { s = {a = 7};}
error: syntax error, unexpected '}', expecting ';', at (string):1:46
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) { s = {a = 7;};}
7
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) {}
27
nix-repl> ({ s ? { a = 27;}, p ? s.a }: p) { s = {c = 7;};}
error: attribute 'a' missing, at (string):1:24
toraritte@mandarine [~/Downloads/niv-experiments]
0 [20:32:30] ll
total 12
drwxr-xr-x 3 toraritte users 4096 Aug 6 19:22 ./
drwx------ 4 toraritte users 4096 Aug 6 19:22 ../
drwxr-xr-x 2 toraritte users 4096 Aug 6 19:22 nix/
toraritte@mandarine [~/Downloads/niv-experiments]
0 [20:32:36] nix repl
Welcome to Nix version 2.3.6. Type :? for help.
nix-repl> ./nix
./nix
nix-repl> ./nix/sources.
./nix/sources.json ./nix/sources.nix
nix-repl> ./nix/sources.nix
/home/toraritte/Downloads/niv-experiments/nix/sources.nix
nix-repl> builtins.typeOf ./nix/sources.nix
"path"
nix-repl> import ./nix/sources.nix
{ __functor = «lambda @ /home/toraritte/Downloads/niv-experiments/nix/sources.nix:134:42»;
niv = { ... }; nixpkgs = { ... }; }
nix-repl> a = 7;
error: syntax error, unexpected ';', expecting $end, at (string):1:3
nix-repl> a = 7
nix-repl> a
7
nix-repl> a = import ./nix/sources.nix
nix-repl> a.
a.__functor a.niv a.nixpkgs
nix-repl> a.ni
a.niv a.nixpkgs
nix-repl> a.ni
a.niv a.nixpkgs
nix-repl> a.nixpkgs
{ branch = "nixos-19.09"; description = "A read-only mirror of NixOS/nixpkgs tracking the
released channels. Send issues and PRs to"; homepage = "https://github.com/NixOS/nixpkgs";
[4.7 MiB DL] downloading 'https://github.com/NixOS/nixpkgs-channels/archive/289466dd6a11c
error: download of 'https://github.com/NixOS/nixpkgs-channels/archive/289466dd6a11c65a7de4
a954d6ebf66c1ad07652.tar.gz' was interrupted
[4.7 MiB DL] downloading 'https://github.com/NixOS/nixpkgs-channels/archive/289466dd6a11c
[4.7 MiB DL]
nix-repl> builtins.typeOf "~/clones/nixpkgs/nixos/maintainers/scripts/azure-new/shell.nix"
error: interrupted by the user
[4.7 MiB DL]
nix-repl> builtins.typeOf "~/clones/nixpkgs/nixos/maintainers/scripts/azure-new/shell.nix"
"string"
nix-repl> builtins.typeOf ~/clones/nixpkgs/nixos/maintainers/scripts/azure-new/shell.nix
"path"
nix-repl> sh = import ~/clones/nixpkgs/nixos/maintainers/scripts/azure-new/shell.nix
nix-repl> sh
sh
nix-repl> sh
«lambda @ /home/toraritte/clones/nixpkgs/nixos/maintainers/scripts/azure-new/shell.nix:3:4
»
nix-repl> sh {}
error: cannot enqueue download request because the download thread is shutting down
[4.7 MiB DL]
[4.7 MiB DL]
[4.7 MiB DL]
toraritte@mandarine [~/Downloads/niv-experiments]
0 [20:37:06] nix repl
Welcome to Nix version 2.3.6. Type :? for help.
nix-repl> sh = import ~/clones/nixpkgs/nixos/maintainers/scripts/azure-new/shell.nix
nix-repl> sh {}
«derivation /nix/store/zbdxqggazjq7z2vc6jxhrrhjz0hq3zzl-nix-shell.drv»
nix-repl>
nix-repl> d = sh {}
nix-repl> d
d derivationStrict
derivation dirOf
nix-repl> d
d derivationStrict
derivation dirOf
nix-repl> d.
d.AZURE_CONFIG_DIR d.nativeBuildInputs
d.__ignoreNulls d.nobuildPhase
d.all d.out
d.args d.outPath
d.buildInputs d.outputName
d.builder d.outputUnspecified
d.configureFlags d.outputs
d.depsBuildBuild d.overrideAttrs
d.depsBuildBuildPropagated d.passthru
d.depsBuildTarget d.patches
d.depsBuildTargetPropagated d.phases
d.depsHostHost d.propagatedBuildInputs
d.depsHostHostPropagated d.propagatedNativeBuildInputs
d.depsTargetTarget d.shellHook
d.depsTargetTargetPropagated d.stdenv
d.doCheck d.strictDeps
d.doInstallCheck d.system
d.drvAttrs d.type
d.drvPath d.userHook
d.meta
d.name
nix-repl> d.all
[ «derivation /nix/store/zbdxqggazjq7z2vc6jxhrrhjz0hq3zzl-nix-shell.drv» ]
nix-repl> d.
d.AZURE_CONFIG_DIR d.nativeBuildInputs
d.__ignoreNulls d.nobuildPhase
d.all d.out
d.args d.outPath
d.buildInputs d.outputName
d.builder d.outputUnspecified
d.configureFlags d.outputs
d.depsBuildBuild d.overrideAttrs
d.depsBuildBuildPropagated d.passthru
d.depsBuildTarget d.patches
d.depsBuildTargetPropagated d.phases
d.depsHostHost d.propagatedBuildInputs
d.depsHostHostPropagated d.propagatedNativeBuildInputs
d.depsTargetTarget d.shellHook
d.depsTargetTargetPropagated d.stdenv
d.doCheck d.strictDeps
d.doInstallCheck d.system
d.drvAttrs d.type
d.drvPath d.userHook
d.meta
d.name
nix-repl> d.
d.AZURE_CONFIG_DIR d.nativeBuildInputs
d.__ignoreNulls d.nobuildPhase
d.all d.out
d.args d.outPath
d.buildInputs d.outputName
d.builder d.outputUnspecified
d.configureFlags d.outputs
d.depsBuildBuild d.overrideAttrs
d.depsBuildBuildPropagated d.passthru
d.depsBuildTarget d.patches
d.depsBuildTargetPropagated d.phases
d.depsHostHost d.propagatedBuildInputs
d.depsHostHostPropagated d.propagatedNativeBuildInputs
d.depsTargetTarget d.shellHook
d.depsTargetTargetPropagated d.stdenv
d.doCheck d.strictDeps
d.doInstallCheck d.system
d.drvAttrs d.type
d.drvPath d.userHook
d.meta
d.name
nix-repl> d.name
"nix-shell"
nix-repl> d.out
«derivation /nix/store/zbdxqggazjq7z2vc6jxhrrhjz0hq3zzl-nix-shell.drv»
nix-repl> d.meta
{ available = true; name = "nix-shell"; outputsToInstall = [ ... ]; position = "/nix/store
/372qxm8fhc4s1fbnjmraxhg4ynb8npx7-source/pkgs/build-support/mkshell/default.nix:28"; }
nix-repl> d.shellHook
""
nix-repl> d.system
"x86_64-linux"
nix-repl> d.drv
d.drvAttrs d.drvPath
nix-repl> d.drvPath
"/nix/store/zbdxqggazjq7z2vc6jxhrrhjz0hq3zzl-nix-shell.drv"
nix-repl> d.build
d.buildInputs d.builder
nix-repl> d.buildInputs
[ «derivation /nix/store/jh63xd5ni28jdzzcynzlzsl95vnm2bzv-python3.7-azure-cli-2.1.0.drv» «
derivation /nix/store/20vwa6qpx8w3ar66x1fmrjlwy86c7b71-bash-4.4-p23.drv» «derivation /nix/
store/pvb0rllnpya9n9d484fibzq4mi53p754-nss-cacert-3.49.2.drv» «derivation /nix/store/j63hg
qiszz1hi4kivc4f9bgf4biplc2h-azure-storage-azcopy-10.3.2.drv» ]
nix-repl> d.nativeBuildInputs
[ ]
nix-repl> { a = 27; b = 7;}:
error: syntax error, unexpected ':', expecting $end, at (string):1:18
nix-repl> { s ? { a = 27; }, p ? s.a}: {}
«lambda @ (string):1:1»
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {}
27
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {{}; }
error: syntax error, unexpected '{', at (string):1:35
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {{} }
error: syntax error, unexpected '{', at (string):1:35
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {{s = { a = 7;};} }
error: syntax error, unexpected '{', at (string):1:35
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {{s = { a = 7;};}
error: syntax error, unexpected '{', at (string):1:35
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {s = { a = 7;};}
7
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {s = {};}
error: attribute 'a' missing, at (string):1:25
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {s = { a = 7;};}
7
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {p = 9}
error: syntax error, unexpected '}', expecting ';', at (string):1:40
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {p = 9;}
9
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {s = {};}
error: attribute 'a' missing, at (string):1:25
nix-repl> ({ s ? { a = 27; }, p ? s.a}: p) {s = {}; p = 9;}
9
```