Concept of command

[raphaelvigee]

In order to support a more natural use, we want to support the concept of "verb" + path, instead of target address
In order to provide a smooth interaction with the rest of the system, this will simply be some syntactic sugar on top of the existing address system.

Example:

# some/folder/BUILD
target(name="build")
target(name="run")
target(name="run-stage1")
target(name="run-stage0")
target(name="lint")
target(name="format")

# other/folder/BUILD
target(name="run")
target(name="build")
target(name="validate")

----------------

heph build some/folder                             => heph r //some/folder:build

heph run-stage0 some/folder                        => heph r //some/folder:run-stage0
cd some/folder && heph run-stage0

heph validate other/folder                         => heph r //other/folder:validate

In the example of formatting, one may want to format a specific file only: heph format some/folder/src/deep.ts
This should end up running //some/folder:format with the argument src/deep.ts, basically going up the tree the requested directory until a suitable target is found

If the path part is omitted, assume the current directory

Alternate approach:

# some/folder/BUILD
target(name="build")
target(name="run", cmd=True) # syntactic sugar to make it a command
target(name="run-stage1")
target(name="run-stage0")
target(name="lint")
target(name="format")

cmd(name="build", deps=":build")
cmd(name="build", deps=":build", match={"os": "$os", "arch": "$arch"})
cmd(name="lint", deps="//some/folder && lint")

cmd(name="run", deps=":run-stage1", match={"backend": "stage1"})
cmd(name="run", deps=":run-stage0", match={"backend": "stage0"})

----------------

heph build some/folder                             => heph r //some/folder:build
cd some/folder heph build

heph build --os=linux --arch=amd64

heph lint some/folder

heph run some/folder                                 => heph r //some/folder:run
heph run some/folder --backend=stage1 => heph r //some/folder:run-stage1
heph run some/folder --backend=stage0 => heph r //some/folder:run-stage0